EBSD Conference_Terry
•
1 like•145 views
1. The study developed a methodology to investigate micromechanical deformation in two-phase titanium alloys using electron backscatter diffraction (EBSD) characterization and focused ion beam micropillar compression testing. 2. EBSD was used to select regions of interest with comparable grain structures between alloy variants, and to inform micropillar fabrication targeting specific slip systems. 3. Results showed the deformation behavior depends on slip system and morphology, and one alloy exhibited slip-system dependent strain rate sensitivity while the other was slip-system independent.
Report
Share
Report
Share
Download to read offline
![Methodology
Micromechanical Deformation of Two-Phase Ti Alloys, Informed by EBSD Characterisation
Tea-Sung (Terry) Jun*, Giorgio Sernicola, Vivian Tong, Fionn P E Dunne, T Ben Britton
Department of Materials, Imperial College of London, Exhibition Road, London, SW7 2AZ, UK
Motivation
Results
Key findings Acknowledgement
● Cold dwell fatigue has been a long-standing issue in aero-engine industry.
● Dwell susceptible alloys are those which suffer from a reduction in the life due to
the inclusion of a short load-hold (~120s) in fatigue.
● This could be either be a chemical, structural or morphological effect due to
difference in β-phase volume fraction and local chemistry.
● As dwell includes a time-dependant holding step, rate sensitivity and the
resultant load shedding are clearly crucial factors in the dwell phenomenon.
Ti-6Al-2Sn-4Zr-2Mo(dwell sensitive) Ti-6Al-2Sn-4Zr-6Mo(not dwell sensitive)
EBSD orientation maps observed with respect to normal to the forging direction
Aims
● To develop a methodology for investigating micromechanics of two-phase materials
● To study a local deformation mechanism of two-phase Ti624x (x=2 and 6 Mo)
● To understand the effect of α/β morphology on σ-ε behaviour
● To measure micromechanical rate sensitivity
(left) ‘Rogue’ grain combination and (right) the resultant stress variation along the path A-A′ [1]
1. Material processing
○ Create large α-lamellar separated by thin β-
ligaments, to make micropillars of α-β-α structure
2. EBSD mapping (Bruker)
3. Regions of Interests (ROIs)
4. FIB – micropillar fabrication 5. SEM/Alemnis in-situ compression
front back side1 side2
○ Square pillar: easy slip trace analysis, In-situ HR-EBSD
○ Find comparable grains between Ti6242&6 by comparing misorientation and Schmid factor(M)
Large EBSD map of α phase β-reconstruction [2] Smaller EBSD map of α/β phase
and
EBSD Characterisation
We are grateful to the Engineering and Physical Science
Research Council for funding through HexMat (EP/K034332/1).
Contact
▪ Email: t.jun@imperial.ac.uk (or terryjun83@gmail.com)
▪ http://www3.imperial.ac.uk/engineeringalloys
▪ http://www3.imperial.ac.uk/hexmat
Morphology Effects
Local Deformation Behaviour Rate Sensitivity
Ti6242 Ti6246
○ Pillars from Ti6242-A1: same α orientation, same strain rate (1.2x10-3s-1), various β morphology
○ Pillar details: a top width of 2µm, an aspect ratio of 1.9:1~2.2:1 and taper angle of ~5.5°
Similar β morphology
Different β morphology
Slip System Primary slip Mode SF(A2) SF(B2)
Basal
(0001)<11-20>
B1 0.101 0.087
B2 0.461 0.432
B3 0.361 0.345
Prismatic
{10-10}<11-20>
P1 0.188 0.147
P2 0.111 0.091
P3 0.077 0.056
Slip System Primary slip Mode SF(A3) SF(B3)
Basal
(0001)<11-20>
B1 0.068 0.052
B2 0.023 0.019
B3 0.046 0.033
Prismatic
{10-10}<11-20>
P1 0.493 0.488
P2 0.306 0.334
P3 0.186 0.154
Schmid Factors (A2 & B2) Schmid Factors (A3 & B3)
α[197,20,157]
β[296,36,30]
A1
8µm
30µm 30µm 30µm
30µm
α[20,38,318]
β[302,37,30]
α[125,86,229]
β[229,19,121]
α[117,87,231]
Β[249,4,92]
α[19,33,319]
Β[149,17,217]
A2
A3
B3 B2
300µm
Strain Rate Sensitivity exponent:Basal slip
Prism slip
Side2view
Front view
Loading Ti6242-A2
Side2
Ti6246-B2
Side2
Ti6242-A3 Ti6246-B3
Front Front
Slip trace analysis on deformed pillars: yellow and blue arrows indicate primary
and secondary slip system, respectively, anticipated from Schmid factor calculation
σ-ε responseB
P
B B
P P
● Combination of EBSD, FIB and Nanoindenter is an effective tool to investigate micromechanical deformation of two-phase materials.
● EBSD was effectively used to select individual slip systems.
● Both Ti6242 and Ti6246 are rate-sensitive : Ti6242 as a slip system dependent and Ti6246 as a slip system independent rate sensitive.
Engineering Stress vs. Engineering Strain in Ti6242(A2,A3) and Ti6246(B2,B3)
Experiments: displacement control, strain rates of 1.5x10-4s-1 ~ 1.0x10-2s-1
Large EBSD maps on Ti6242 and Ti6246, including smaller maps of ROIs: A1 for morphology study and A2-B2 & A3-B3 have comparable α crystal structure
200µm 60µm
Experimental setup of pillar compression using 10µm dia. flat punch tip
Micropillar fabricated using Helios Nanolab focused ion
beam (FIB) with an aid of a script created by AutoScriptTM
▪ Similar β morphology, similar σ-ε response in elastic and early stage of plastic regime
▪ Schmid’s law works well to anticipate local deformation behaviour ▪ Quite different σ-ε responses in basal/prism slip in Ti6242, but similar in Ti6246
B B
P P
Strain Rate (έ) vs. Flow Stress (at ε=0.5) in log-log form
▪ Ti6242: different m values with respect to activated slip system
▪ Ti6246: similar m values regardless of activated slip system
References [1] D.L. McDowell and F.P.E. Dunne (2010) Int J Fatigue, [2] Courtesy of Prof. Bradley P Wynne (Univ. of Sheffield)
Load](https://image.slidesharecdn.com/75ae6286-e2cd-44b5-8d44-09d411f3e149-160520074238/85/EBSD-Conference_Terry-1-320.jpg)
Recommended
Electron backscatter diffraction in materials
This document provides an overview of electron backscatter diffraction (EBSD), including its history, working principles, applications, strengths, and limitations. EBSD uses electron diffraction patterns captured in a scanning electron microscope to determine grain morphology, crystallographic orientation, and phase composition of materials. The technique has been improved over time through automation and integration with other characterization methods. It provides fast, reliable microstructural characterization of crystalline materials and is widely used in materials science research and industry.
3D EBSD Overview - Metallurgical Mater Trans A Vol 39 A (2008) 374
This document describes a new technique for 3D characterization of crystalline microstructures using serial sectioning with a focused ion beam and electron backscatter diffraction (EBSD) in a scanning electron microscope. Key points:
- Serial sectioning is used to cut thin sections from the sample, which are then characterized using EBSD orientation microscopy to determine crystal orientations in 3D.
- This allows full crystallographic characterization of microstructural features like interfaces that is not possible with conventional 2D analysis.
- The technique achieves resolutions as fine as 50x50x50 nm3 and can characterize sample volumes up to 50x50x50 μm3.
- Examples demonstrate applications to characterize microstructures like
APT Presentation - George J. Ferko V
This document proposes an experiment to use atomic probe tomography to map grain boundaries in materials at sub-nanometer spatial resolution in order to directly observe the Gibbsian grain boundary solute excess and determine grain boundary width. It discusses challenges with sample preparation for atomic probe tomography and analyzing the reconstructed 3D maps to interpret results on solute segregation and grain boundary width.
POSTER_RONAK
Synchrotron X-ray topography (SXRT) is a non-destructive method for studying crystalline materials like defects and strain fields within crystals. Using a white beam for SXRT provides benefits such as not requiring sample orientation, recording multiple reflections simultaneously, visualizing all crystal parts at once with good resolution. X-ray diffraction is also non-destructive and provides information on chemical composition and crystal structure of materials through Bragg's law relating wavelength and diffraction angle. Section mode SXRT imaging is essential to avoid sample heating from large beams and allow separation of cap and substrate images for future reconstruction of MEMS structures. CdTe samples showed high quality with some scratches and inclusions observed.
Poster aps2020 (sapkota, yub)
This study investigated the interface properties and magnetotransport characteristics of amorphous Boron nitride (BN) and Bismuth selenide (Bi2Se3) layered insulators grown with ferromagnetic Cobalt layers using magnetron sputtering. X-ray reflectivity measurements showed sharp interfaces with minimal diffusion for Co/BN/Co, while an unexpected interfacial layer was detected at the Co/Bi2Se3 interface, indicating interdiffusion. Transport measurements exhibited tunneling behavior and tunnel magnetoresistance for Co/BN/Co, but metallic conduction for Co/Bi2Se3/Co, likely due to interdiffusion impeding spintronic effects. The results suggest BN is better suited than
ion induced nanopatterning of binary compound
The document summarizes research on ion beam nanostructuring of CoxSi1-x binary surfaces and the role of stoichiometry and sample swinging. It discusses (1) how the initial stoichiometry affects pattern evolution, with ripples forming within a narrow stoichiometric window, (2) how substrate swinging introduces anisotropic surface modification and lateral mass transport, affecting morphology. Future work is proposed to better understand mobility effects, silicide formation roles, and potential magnetic and electrical applications of patterned binary surfaces.
Slective Functionalization
This document proposes a novel approach to selectively functionalize a specific face of gold nanorods synthesized using on-wire lithography (OWL). The nanorods have a multi-segmented gold-nickel-gold composition. The method uses a self-assembled monolayer to protect exposed gold surfaces, while etching removes the nickel segment and exposes a clean gold surface. This exposed gold surface can then be selectively functionalized, such as with biotinylated molecules and streptavidin-coated nanoparticles, demonstrating the approach. Experiments are described to determine the optimal nickel etchant concentration and time needed to remove the nickel without damaging the gold segments.
RESULTS OF FINITE ELEMENT ANALYSIS FOR INTERLAMINAR FRACTURE REINFORCED THERM...
The double cantilever beam (DCB) is widely used for fracture toughness testing and it has become popular
for opening-mode (mode I) delamination testing of laminated composites. Delamination is a crack that
forms between the adjacent plies of a composite laminate at the brittle polymer resin. This study was
conducted to emphasize the need for a better understanding of the DCB specimen of different fabric
reinforced systems (carbon fibers) with a thermoplastic matrix (EP, PEI), by using the extended finite
element method (X-FEM). It is well known that in fabric reinforced composites fracture mechanisms
include microcracking in front of the crack tip, fiber bridging and multiple cracking, and both contribute
considerably to the high interlaminar fracture toughness measured. That means, the interlaminar fracture
toughness of a composite is not controlled by a single material parameter, but is a result of a complex
interaction of resin, fiber and interface properties.
Recommended
Electron backscatter diffraction in materials
This document provides an overview of electron backscatter diffraction (EBSD), including its history, working principles, applications, strengths, and limitations. EBSD uses electron diffraction patterns captured in a scanning electron microscope to determine grain morphology, crystallographic orientation, and phase composition of materials. The technique has been improved over time through automation and integration with other characterization methods. It provides fast, reliable microstructural characterization of crystalline materials and is widely used in materials science research and industry.
3D EBSD Overview - Metallurgical Mater Trans A Vol 39 A (2008) 374
This document describes a new technique for 3D characterization of crystalline microstructures using serial sectioning with a focused ion beam and electron backscatter diffraction (EBSD) in a scanning electron microscope. Key points:
- Serial sectioning is used to cut thin sections from the sample, which are then characterized using EBSD orientation microscopy to determine crystal orientations in 3D.
- This allows full crystallographic characterization of microstructural features like interfaces that is not possible with conventional 2D analysis.
- The technique achieves resolutions as fine as 50x50x50 nm3 and can characterize sample volumes up to 50x50x50 μm3.
- Examples demonstrate applications to characterize microstructures like
APT Presentation - George J. Ferko V
This document proposes an experiment to use atomic probe tomography to map grain boundaries in materials at sub-nanometer spatial resolution in order to directly observe the Gibbsian grain boundary solute excess and determine grain boundary width. It discusses challenges with sample preparation for atomic probe tomography and analyzing the reconstructed 3D maps to interpret results on solute segregation and grain boundary width.
POSTER_RONAK
Synchrotron X-ray topography (SXRT) is a non-destructive method for studying crystalline materials like defects and strain fields within crystals. Using a white beam for SXRT provides benefits such as not requiring sample orientation, recording multiple reflections simultaneously, visualizing all crystal parts at once with good resolution. X-ray diffraction is also non-destructive and provides information on chemical composition and crystal structure of materials through Bragg's law relating wavelength and diffraction angle. Section mode SXRT imaging is essential to avoid sample heating from large beams and allow separation of cap and substrate images for future reconstruction of MEMS structures. CdTe samples showed high quality with some scratches and inclusions observed.
Poster aps2020 (sapkota, yub)
This study investigated the interface properties and magnetotransport characteristics of amorphous Boron nitride (BN) and Bismuth selenide (Bi2Se3) layered insulators grown with ferromagnetic Cobalt layers using magnetron sputtering. X-ray reflectivity measurements showed sharp interfaces with minimal diffusion for Co/BN/Co, while an unexpected interfacial layer was detected at the Co/Bi2Se3 interface, indicating interdiffusion. Transport measurements exhibited tunneling behavior and tunnel magnetoresistance for Co/BN/Co, but metallic conduction for Co/Bi2Se3/Co, likely due to interdiffusion impeding spintronic effects. The results suggest BN is better suited than
ion induced nanopatterning of binary compound
The document summarizes research on ion beam nanostructuring of CoxSi1-x binary surfaces and the role of stoichiometry and sample swinging. It discusses (1) how the initial stoichiometry affects pattern evolution, with ripples forming within a narrow stoichiometric window, (2) how substrate swinging introduces anisotropic surface modification and lateral mass transport, affecting morphology. Future work is proposed to better understand mobility effects, silicide formation roles, and potential magnetic and electrical applications of patterned binary surfaces.
Slective Functionalization
This document proposes a novel approach to selectively functionalize a specific face of gold nanorods synthesized using on-wire lithography (OWL). The nanorods have a multi-segmented gold-nickel-gold composition. The method uses a self-assembled monolayer to protect exposed gold surfaces, while etching removes the nickel segment and exposes a clean gold surface. This exposed gold surface can then be selectively functionalized, such as with biotinylated molecules and streptavidin-coated nanoparticles, demonstrating the approach. Experiments are described to determine the optimal nickel etchant concentration and time needed to remove the nickel without damaging the gold segments.
RESULTS OF FINITE ELEMENT ANALYSIS FOR INTERLAMINAR FRACTURE REINFORCED THERM...
The double cantilever beam (DCB) is widely used for fracture toughness testing and it has become popular
for opening-mode (mode I) delamination testing of laminated composites. Delamination is a crack that
forms between the adjacent plies of a composite laminate at the brittle polymer resin. This study was
conducted to emphasize the need for a better understanding of the DCB specimen of different fabric
reinforced systems (carbon fibers) with a thermoplastic matrix (EP, PEI), by using the extended finite
element method (X-FEM). It is well known that in fabric reinforced composites fracture mechanisms
include microcracking in front of the crack tip, fiber bridging and multiple cracking, and both contribute
considerably to the high interlaminar fracture toughness measured. That means, the interlaminar fracture
toughness of a composite is not controlled by a single material parameter, but is a result of a complex
interaction of resin, fiber and interface properties.
Depth profiling and morphological characterization of AlN thin films deposite...
Depth profiling and morphological characterization of AlN thin films deposite...Javier García Molleja
Authors: C. Macchi, J. Bürgi, J. García Molleja, S. Mariazzi, M. Piccoli, E. Bemporad, J. Feugeas, R.S. Brusa, A. Somoza.
The European Physical Journal - Applied Physics (2014) 67: 21301 (August 1st, 2014)
Only the first page is uploaded because EDP Sciences' copyrigth policy. Available at: http://dx.doi.org/10.1051/epjap/2014140191surface texturing by rapid scanning of pulsed laser beam
This document discusses using rapid laser scanning to texture surfaces for applications such as solar cells and military equipment. It demonstrates that laser scanning allows for high flexibility and precision compared to other texturing methods. The document investigates different laser parameters and their effects on texturing mechanisms and performance. Optimal parameters were identified that enhanced light trapping for solar cells through crystalline structures and enabled stealth and thermal functions for military applications.
Morphological and Optical Study of Sol-Gel SpinCoated Nanostructured CdSThin ...
Nanostructured CdS thin films of different thicknesses were deposited on a cleaned glass substrate
using sol-gel spin coating technique. CdS thin films were prepared using cadmium acetate as cadmium source
and thiourea as sulfur source. The Morphological, chemical composition, and optical properties of the spin- coated
CdS thin film were studied using field emission- scanning electron microscopy (FE-SEM), Energy dispersive X –ray
(EDX) spectroscopy, and a UV-Vis-NIR spectrophotometer.The morphological results revealed that the films consist
of agglomerated spherical CdS nanoparticles with diameter < 20 nm, which distributed uniformly on the substrate
surface.The films show high transmittance > 90% and very strong absorption edge at 295 nm.The absorption edge
shifts towards longer wavelength as the film thickness increased.
11.the optical constants of highly absorbing films using the spectral reflect...
This document summarizes a study that determined the optical constants of thin films of rhodium metal using spectral reflectance measurements. The researchers measured the reflectance of rhodium films of varying thicknesses using a double beam spectrophotometer. They then used Kramers-Kronig relations to calculate the phase angle from the reflectance data and determine the real refractive index and extinction coefficient. Their method provides accurate optical constants without needing transmission measurements. They found the refractive index and extinction coefficient were nearly equal for thin films and that their method compared well to values from other interference-based techniques.
USING ADVANCED INSPECTION METHOD (THREE-DIMENSIONAL ULTRASONIC)IN RECOGNITION...
In this study, using Harfang Code 32 device, the slag catcher pipelines in one of the South Pars phases
were tested. In radiography method of these lines, no clear defect was observed in radiographic films due
to the high thickness of 40 mm. However, marvelous results were obtained using advanced ultrasonic.
Review and analysis of the results will result in high potential of three-dimensional ultrasonic method in
identifying defects in pipelines with high thicknesses and preventing financial and life-threatening risks
during the use of these refineries in the future.
Pulse Energy Effect on the Optical Properties of Pulse Laser Deposited SiO2 T...
In this work the effect of laser pulse energy on the optical properties of five samples of SiO2 thin film deposited using pulse laser deposition technique was studied Pulse energies of 100,150,180, 200 and 250 mj with fixed pulse repetition rate and number of pulses of 2 Hz, and 10 pulses, were used The target to substrate distance and angle were fixed The film thickness was measured by FESEM, and the transmission spectrum at certain wavelengths for each film was recorded SiO2 thin films transmission data and the measured film thicknesses were used to deduce their optical properties The results showed that increasing the pulse energy results in an increase of the film thickness and the morphology of the films becomes more dense and non-smooth at higher pulse energy, also the optical properties showed to be affected by the thickness variation and hence by the pulse energy Nafie A. Almuslet | Yousif H. Alsheikh | Kh. M. Haroun "Pulse Energy Effect on the Optical Properties of Pulse Laser Deposited SiO2 Thin Films" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-2 | Issue-6 , October 2018, URL: http://www.ijtsrd.com/papers/ijtsrd18341.pdf
Metallic Thin Film Deposition for Sensing Applications
This poster presented the deposition of metallic thin film by the wet-chemistry methods, i.e. the galvanic displacement and the electrodeposition. The methods offered not only the simplicity and low-cost of the experimental setup, but also certain levels of control over the morphology, density, and size of the deposited metallic nanostructures. Several characterization methods were applied to examine the thin films, including the SEM, AFM, XRD, and XPS. Furthermore, thin film deposition by physical and chemical vapor deposition will be outlined for future work. Finally, the samples were tested for their applicability for Surface Enhanced Raman Spectroscopy (SERS) in which low concentrations of Rhodamine 6G (R6G) dye and paraoxon, a highly toxic organophosphate pesticide, were detected. They showed promising results.
laser conoscopy
The document discusses laser conoscopy, a method for examining large optical crystals. It presents the theoretical basis for analyzing conoscopic patterns in crystals and calculates the effects of sample thickness, angular aperture, and refractive indices on the patterns. Experimental conoscopic patterns are shown for various crystals, demonstrating the method's ability to characterize crystal quality and examine crystals too large for conventional microscopy. Lasers provide advantages over traditional light sources for conoscopy, and further developments could increase the technique's capabilities.
(10-11) preferential orientation of polycrystalline AlN grown on SiO2/Si wafe...
(10-11) preferential orientation of polycrystalline AlN grown on SiO2/Si wafe...Javier García Molleja
Authors: Juan Bürgi, Javier García Molleja, Raúl Bolmaro, Mattia Piccoli, Edoardo Bemporad, Aldo Craievich, Jorge Feugeas.
Published in: The European Physical Journal - Applied Physics (2016) 74: 10301
Because of copyright transfer to EDP Sciences only the first page is provided. Available at: http://dx.doi.org/10.1051/epjap/2016150446HIGH THROUGHPUT MICROSTRUCTURE-MECHANICAL PROPERTY DATA COLLECTION
This document discusses high throughput characterization of microstructures and their mechanical properties. It presents methods for collecting high resolution microstructure data more efficiently using adaptive scan patterns. It also discusses integrating nanoindentation with electron backscatter diffraction to efficiently connect the microstructure and mechanical response of materials at multiple length scales, from nanometers to millimeters. This would help determine how representative a small sample area is of the entire part and reduce the number of samples and tests needed.
Micro & nano manufacturing
Nanomanufacturing is both the generation of nanoscaled materials, which can be powders or liquids, and the assembling of parts "base up" from nanoscaled materials or "top down" in littlest strides for high exactness, utilized as a part of a few advances, for example, laser removal, drawing and others. Nanomanufacturing varies from atomic assembling, which is the produce of complex, nanoscale structures by method for nonbiological mechanosynthesis.
Zach & Matt PosterV2
This document summarizes analytical work done to characterize the thickness and composition of thin semiconducting films. Rutherford backscattering spectroscopy (RBS) was used to non-destructively analyze film layer structure and elemental composition. Data from RBS was modeled using SIMNRA to determine film thickness, stoichiometry, and elemental layering. Some films showed uniform structure while others had non-uniformities that complicated analysis. Results from RBS and energy-dispersive X-ray spectroscopy (EDS) were complementary. Film characterization allows determining electrical properties and provides feedback for improving fabrication methods.
IRJET - Photoluminescence Study of Rare Earth Doped ZnO Nanoparticles
This document reports on a study of photoluminescence properties of rare earth doped ZnO nanoparticles. ZnO nanoparticles were synthesized using a chemical method with thiourea as a capping agent. X-ray diffraction and scanning electron microscopy were used to characterize the structural and morphological properties. The particle sizes measured from XRD were 56nm for doped samples and 66nm for undoped. SEM images showed agglomerated nanoparticles without distinct structures. Absorption spectra showed band gaps of 4.32eV for undoped and 4.28eV for doped samples. Photoluminescence excitation and emission spectra of doped samples exhibited characteristic peaks of Eu3+ ions.
Porosity and the Magnetic Properties of Aluminium Doped Nickel Ferrite
The nanocrystalline particles of Aluminium Al doped nickel Ni ferrites with general formula NiAlxFe2 xO4 x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0 were synthesized by sol gel auto combustion technique. The formation of single phase cubic spinel was confirmed by X ray diffraction analyses. Morphological features of the samples are studied by Scanning Electron Microscopy SEM to examine the particle size, shape and homogeneity of sample. The magnetic hysteresis graphs were obtained to understand their magnetic behaviours. The relative permeability µr of AlNi ferrite samples shows a decrease for all samples as Al content increases. Sandar Oo | Ye Wint Tun | Shwe Zin Oo "Porosity and the Magnetic Properties of Aluminium Doped Nickel Ferrite" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-5 , August 2019, URL: https://www.ijtsrd.com/papers/ijtsrd25240.pdfPaper URL: https://www.ijtsrd.com/physics/other/25240/porosity-and-the-magnetic-properties-of-aluminium-doped-nickel-ferrite/sandar-oo
Crystalmechanics Introduction
1) The document describes multiscale models of crystals developed by the Department of Microstructure Physics and Metal Forming.
2) These models use physics-based constitutive laws and mean field theory to model phenomena from the atomic to component scale, including dislocation dynamics, grain boundaries, orientation gradients, size effects, and texture evolution.
3) The models are implemented in crystal plasticity finite element methods to simulate the microstructure mechanics of materials undergoing deformation across multiple scales.
Thickness and n&k measurement with MProbe
Spectroscopic reflectance is a powerful method for thickness and n&k measurement of the translucent film. MProbe system makes this measurement easy and reliable
http://www.semiconsoft.com/wp/mprobe20desktop/
Morphologies of c-si Solar cell - Targeting the approach with least light ref...
As the Reflection of Sunlight, falling on the solar cells is an big issue for its performance, this presentation deals with some Morphologies, mostly used these days in industries and some others also which was in trend years before, for c-Si cells.
The objective is to find out the most appropriate technology for Surface texturing either with or without AR coating that can reduce reflection to its minimum possible value.
Although, it is understood that, with best technology, cost also increases. Therefore, it is a quite challenging task at the present time to provide a cost effective surface Morphologies to limit the Panel cost to not to rise much.
Structinteg
This document discusses a novel magneto-optic sensor called the MODE sensor that can be used for non-destructive testing of structural integrity. The MODE sensor uses thin films made of rare earth and transition metal oxides that have high magneto-optic properties, allowing it to detect cracks, fissures, and corrosion in structures. A portable system has been designed using this sensor to allow real-time inspection of bridges, fuel tanks, and other metal structures. The system includes image processing and pattern recognition capabilities to help identify defects.
Ndemetalassemb
This document summarizes research on using magneto-optic imaging for non-destructive testing of metal structures. It describes developing new thin-film sensors with improved sensitivity, integrating the sensors and image recognition algorithms into a portable system, and applying a neural network algorithm called SONON to enhance defect detection in images. Laboratory experiments demonstrated the new sensors could detect smaller defects than previous methods. The overall aim is more accurate, automated inspections using portable, wearable equipment.
Chemistry - LSU Poster- Jevon
This document summarizes research on manipulating alkanethiol bilayer films using an atomic force microscope (AFM). The researchers deposited alkanethiol molecules on a gold substrate to form mono- and multilayer films. Using AFM nanoshaving at different force levels, they could selectively remove the top layer of a bilayer (15 nN) or both layers (80 nN). This allowed them to determine film thicknesses and pattern chemically distinct regions at the nanoscale. Going forward, the researchers aim to use nanoshaving to replicate surface features and explore patterning of complex polymeric molds.
Free vibration investigation of thin plates under various circumstances using...
This document summarizes a study that used finite element analysis to investigate how various factors affect the vibration behavior of thin composite plates. Specifically, it examined how natural frequencies and mode shapes are influenced by material type, laminate stacking sequence, boundary conditions, geometry, and fiber orientation. Finite element models of plates made of carbon-epoxy composite and aluminum alloy were created and analyzed under different configurations. The results showed that boundary conditions, laminate stacking sequence, and aspect ratio can significantly impact natural frequencies, with fully fixed boundaries producing the highest frequencies. Understanding these effects is important for designing structures to avoid resonance issues.
ICAM3D-2014 BMG experiments and modelling -
Bulk metallic glasses (BMGs) are amorphous alloys that can be formed into bulk samples rather than just thin films. This document discusses BMGs and characterizes a Zr-based BMG alloy. It describes experiments using 3-point bending and wedge indentation to study shear band formation. Wedge indentation showed vein-like structures and shear bands initiating and propagating with increasing load. Nanoindentation found fracture surfaces weaker than the bulk. Finite element modeling used cohesive zone elements to simulate shear band propagation. Future work includes gradient plasticity modeling of nucleation and shear band effects.
More Related Content
What's hot
Depth profiling and morphological characterization of AlN thin films deposite...
Depth profiling and morphological characterization of AlN thin films deposite...Javier García Molleja
Authors: C. Macchi, J. Bürgi, J. García Molleja, S. Mariazzi, M. Piccoli, E. Bemporad, J. Feugeas, R.S. Brusa, A. Somoza.
The European Physical Journal - Applied Physics (2014) 67: 21301 (August 1st, 2014)
Only the first page is uploaded because EDP Sciences' copyrigth policy. Available at: http://dx.doi.org/10.1051/epjap/2014140191surface texturing by rapid scanning of pulsed laser beam
This document discusses using rapid laser scanning to texture surfaces for applications such as solar cells and military equipment. It demonstrates that laser scanning allows for high flexibility and precision compared to other texturing methods. The document investigates different laser parameters and their effects on texturing mechanisms and performance. Optimal parameters were identified that enhanced light trapping for solar cells through crystalline structures and enabled stealth and thermal functions for military applications.
Morphological and Optical Study of Sol-Gel SpinCoated Nanostructured CdSThin ...
Nanostructured CdS thin films of different thicknesses were deposited on a cleaned glass substrate
using sol-gel spin coating technique. CdS thin films were prepared using cadmium acetate as cadmium source
and thiourea as sulfur source. The Morphological, chemical composition, and optical properties of the spin- coated
CdS thin film were studied using field emission- scanning electron microscopy (FE-SEM), Energy dispersive X –ray
(EDX) spectroscopy, and a UV-Vis-NIR spectrophotometer.The morphological results revealed that the films consist
of agglomerated spherical CdS nanoparticles with diameter < 20 nm, which distributed uniformly on the substrate
surface.The films show high transmittance > 90% and very strong absorption edge at 295 nm.The absorption edge
shifts towards longer wavelength as the film thickness increased.
11.the optical constants of highly absorbing films using the spectral reflect...
This document summarizes a study that determined the optical constants of thin films of rhodium metal using spectral reflectance measurements. The researchers measured the reflectance of rhodium films of varying thicknesses using a double beam spectrophotometer. They then used Kramers-Kronig relations to calculate the phase angle from the reflectance data and determine the real refractive index and extinction coefficient. Their method provides accurate optical constants without needing transmission measurements. They found the refractive index and extinction coefficient were nearly equal for thin films and that their method compared well to values from other interference-based techniques.
USING ADVANCED INSPECTION METHOD (THREE-DIMENSIONAL ULTRASONIC)IN RECOGNITION...
In this study, using Harfang Code 32 device, the slag catcher pipelines in one of the South Pars phases
were tested. In radiography method of these lines, no clear defect was observed in radiographic films due
to the high thickness of 40 mm. However, marvelous results were obtained using advanced ultrasonic.
Review and analysis of the results will result in high potential of three-dimensional ultrasonic method in
identifying defects in pipelines with high thicknesses and preventing financial and life-threatening risks
during the use of these refineries in the future.
Pulse Energy Effect on the Optical Properties of Pulse Laser Deposited SiO2 T...
In this work the effect of laser pulse energy on the optical properties of five samples of SiO2 thin film deposited using pulse laser deposition technique was studied Pulse energies of 100,150,180, 200 and 250 mj with fixed pulse repetition rate and number of pulses of 2 Hz, and 10 pulses, were used The target to substrate distance and angle were fixed The film thickness was measured by FESEM, and the transmission spectrum at certain wavelengths for each film was recorded SiO2 thin films transmission data and the measured film thicknesses were used to deduce their optical properties The results showed that increasing the pulse energy results in an increase of the film thickness and the morphology of the films becomes more dense and non-smooth at higher pulse energy, also the optical properties showed to be affected by the thickness variation and hence by the pulse energy Nafie A. Almuslet | Yousif H. Alsheikh | Kh. M. Haroun "Pulse Energy Effect on the Optical Properties of Pulse Laser Deposited SiO2 Thin Films" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-2 | Issue-6 , October 2018, URL: http://www.ijtsrd.com/papers/ijtsrd18341.pdf
Metallic Thin Film Deposition for Sensing Applications
This poster presented the deposition of metallic thin film by the wet-chemistry methods, i.e. the galvanic displacement and the electrodeposition. The methods offered not only the simplicity and low-cost of the experimental setup, but also certain levels of control over the morphology, density, and size of the deposited metallic nanostructures. Several characterization methods were applied to examine the thin films, including the SEM, AFM, XRD, and XPS. Furthermore, thin film deposition by physical and chemical vapor deposition will be outlined for future work. Finally, the samples were tested for their applicability for Surface Enhanced Raman Spectroscopy (SERS) in which low concentrations of Rhodamine 6G (R6G) dye and paraoxon, a highly toxic organophosphate pesticide, were detected. They showed promising results.
laser conoscopy
The document discusses laser conoscopy, a method for examining large optical crystals. It presents the theoretical basis for analyzing conoscopic patterns in crystals and calculates the effects of sample thickness, angular aperture, and refractive indices on the patterns. Experimental conoscopic patterns are shown for various crystals, demonstrating the method's ability to characterize crystal quality and examine crystals too large for conventional microscopy. Lasers provide advantages over traditional light sources for conoscopy, and further developments could increase the technique's capabilities.
(10-11) preferential orientation of polycrystalline AlN grown on SiO2/Si wafe...
(10-11) preferential orientation of polycrystalline AlN grown on SiO2/Si wafe...Javier García Molleja
Authors: Juan Bürgi, Javier García Molleja, Raúl Bolmaro, Mattia Piccoli, Edoardo Bemporad, Aldo Craievich, Jorge Feugeas.
Published in: The European Physical Journal - Applied Physics (2016) 74: 10301
Because of copyright transfer to EDP Sciences only the first page is provided. Available at: http://dx.doi.org/10.1051/epjap/2016150446HIGH THROUGHPUT MICROSTRUCTURE-MECHANICAL PROPERTY DATA COLLECTION
This document discusses high throughput characterization of microstructures and their mechanical properties. It presents methods for collecting high resolution microstructure data more efficiently using adaptive scan patterns. It also discusses integrating nanoindentation with electron backscatter diffraction to efficiently connect the microstructure and mechanical response of materials at multiple length scales, from nanometers to millimeters. This would help determine how representative a small sample area is of the entire part and reduce the number of samples and tests needed.
Micro & nano manufacturing
Nanomanufacturing is both the generation of nanoscaled materials, which can be powders or liquids, and the assembling of parts "base up" from nanoscaled materials or "top down" in littlest strides for high exactness, utilized as a part of a few advances, for example, laser removal, drawing and others. Nanomanufacturing varies from atomic assembling, which is the produce of complex, nanoscale structures by method for nonbiological mechanosynthesis.
Zach & Matt PosterV2
This document summarizes analytical work done to characterize the thickness and composition of thin semiconducting films. Rutherford backscattering spectroscopy (RBS) was used to non-destructively analyze film layer structure and elemental composition. Data from RBS was modeled using SIMNRA to determine film thickness, stoichiometry, and elemental layering. Some films showed uniform structure while others had non-uniformities that complicated analysis. Results from RBS and energy-dispersive X-ray spectroscopy (EDS) were complementary. Film characterization allows determining electrical properties and provides feedback for improving fabrication methods.
IRJET - Photoluminescence Study of Rare Earth Doped ZnO Nanoparticles
This document reports on a study of photoluminescence properties of rare earth doped ZnO nanoparticles. ZnO nanoparticles were synthesized using a chemical method with thiourea as a capping agent. X-ray diffraction and scanning electron microscopy were used to characterize the structural and morphological properties. The particle sizes measured from XRD were 56nm for doped samples and 66nm for undoped. SEM images showed agglomerated nanoparticles without distinct structures. Absorption spectra showed band gaps of 4.32eV for undoped and 4.28eV for doped samples. Photoluminescence excitation and emission spectra of doped samples exhibited characteristic peaks of Eu3+ ions.
Porosity and the Magnetic Properties of Aluminium Doped Nickel Ferrite
The nanocrystalline particles of Aluminium Al doped nickel Ni ferrites with general formula NiAlxFe2 xO4 x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0 were synthesized by sol gel auto combustion technique. The formation of single phase cubic spinel was confirmed by X ray diffraction analyses. Morphological features of the samples are studied by Scanning Electron Microscopy SEM to examine the particle size, shape and homogeneity of sample. The magnetic hysteresis graphs were obtained to understand their magnetic behaviours. The relative permeability µr of AlNi ferrite samples shows a decrease for all samples as Al content increases. Sandar Oo | Ye Wint Tun | Shwe Zin Oo "Porosity and the Magnetic Properties of Aluminium Doped Nickel Ferrite" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-5 , August 2019, URL: https://www.ijtsrd.com/papers/ijtsrd25240.pdfPaper URL: https://www.ijtsrd.com/physics/other/25240/porosity-and-the-magnetic-properties-of-aluminium-doped-nickel-ferrite/sandar-oo
Crystalmechanics Introduction
1) The document describes multiscale models of crystals developed by the Department of Microstructure Physics and Metal Forming.
2) These models use physics-based constitutive laws and mean field theory to model phenomena from the atomic to component scale, including dislocation dynamics, grain boundaries, orientation gradients, size effects, and texture evolution.
3) The models are implemented in crystal plasticity finite element methods to simulate the microstructure mechanics of materials undergoing deformation across multiple scales.
Thickness and n&k measurement with MProbe
Spectroscopic reflectance is a powerful method for thickness and n&k measurement of the translucent film. MProbe system makes this measurement easy and reliable
http://www.semiconsoft.com/wp/mprobe20desktop/
Morphologies of c-si Solar cell - Targeting the approach with least light ref...
As the Reflection of Sunlight, falling on the solar cells is an big issue for its performance, this presentation deals with some Morphologies, mostly used these days in industries and some others also which was in trend years before, for c-Si cells.
The objective is to find out the most appropriate technology for Surface texturing either with or without AR coating that can reduce reflection to its minimum possible value.
Although, it is understood that, with best technology, cost also increases. Therefore, it is a quite challenging task at the present time to provide a cost effective surface Morphologies to limit the Panel cost to not to rise much.
Structinteg
This document discusses a novel magneto-optic sensor called the MODE sensor that can be used for non-destructive testing of structural integrity. The MODE sensor uses thin films made of rare earth and transition metal oxides that have high magneto-optic properties, allowing it to detect cracks, fissures, and corrosion in structures. A portable system has been designed using this sensor to allow real-time inspection of bridges, fuel tanks, and other metal structures. The system includes image processing and pattern recognition capabilities to help identify defects.
Ndemetalassemb
This document summarizes research on using magneto-optic imaging for non-destructive testing of metal structures. It describes developing new thin-film sensors with improved sensitivity, integrating the sensors and image recognition algorithms into a portable system, and applying a neural network algorithm called SONON to enhance defect detection in images. Laboratory experiments demonstrated the new sensors could detect smaller defects than previous methods. The overall aim is more accurate, automated inspections using portable, wearable equipment.
Chemistry - LSU Poster- Jevon
This document summarizes research on manipulating alkanethiol bilayer films using an atomic force microscope (AFM). The researchers deposited alkanethiol molecules on a gold substrate to form mono- and multilayer films. Using AFM nanoshaving at different force levels, they could selectively remove the top layer of a bilayer (15 nN) or both layers (80 nN). This allowed them to determine film thicknesses and pattern chemically distinct regions at the nanoscale. Going forward, the researchers aim to use nanoshaving to replicate surface features and explore patterning of complex polymeric molds.
What's hot (20)
Depth profiling and morphological characterization of AlN thin films deposite...
Depth profiling and morphological characterization of AlN thin films deposite...
surface texturing by rapid scanning of pulsed laser beam
surface texturing by rapid scanning of pulsed laser beam
Morphological and Optical Study of Sol-Gel SpinCoated Nanostructured CdSThin ...
Morphological and Optical Study of Sol-Gel SpinCoated Nanostructured CdSThin ...
11.the optical constants of highly absorbing films using the spectral reflect...
11.the optical constants of highly absorbing films using the spectral reflect...
USING ADVANCED INSPECTION METHOD (THREE-DIMENSIONAL ULTRASONIC)IN RECOGNITION...
USING ADVANCED INSPECTION METHOD (THREE-DIMENSIONAL ULTRASONIC)IN RECOGNITION...
Pulse Energy Effect on the Optical Properties of Pulse Laser Deposited SiO2 T...
Pulse Energy Effect on the Optical Properties of Pulse Laser Deposited SiO2 T...
Metallic Thin Film Deposition for Sensing Applications
Metallic Thin Film Deposition for Sensing Applications
(10-11) preferential orientation of polycrystalline AlN grown on SiO2/Si wafe...
(10-11) preferential orientation of polycrystalline AlN grown on SiO2/Si wafe...
HIGH THROUGHPUT MICROSTRUCTURE-MECHANICAL PROPERTY DATA COLLECTION
HIGH THROUGHPUT MICROSTRUCTURE-MECHANICAL PROPERTY DATA COLLECTION
IRJET - Photoluminescence Study of Rare Earth Doped ZnO Nanoparticles
IRJET - Photoluminescence Study of Rare Earth Doped ZnO Nanoparticles
Porosity and the Magnetic Properties of Aluminium Doped Nickel Ferrite
Porosity and the Magnetic Properties of Aluminium Doped Nickel Ferrite
Morphologies of c-si Solar cell - Targeting the approach with least light ref...
Morphologies of c-si Solar cell - Targeting the approach with least light ref...
Similar to EBSD Conference_Terry
Free vibration investigation of thin plates under various circumstances using...
This document summarizes a study that used finite element analysis to investigate how various factors affect the vibration behavior of thin composite plates. Specifically, it examined how natural frequencies and mode shapes are influenced by material type, laminate stacking sequence, boundary conditions, geometry, and fiber orientation. Finite element models of plates made of carbon-epoxy composite and aluminum alloy were created and analyzed under different configurations. The results showed that boundary conditions, laminate stacking sequence, and aspect ratio can significantly impact natural frequencies, with fully fixed boundaries producing the highest frequencies. Understanding these effects is important for designing structures to avoid resonance issues.
ICAM3D-2014 BMG experiments and modelling -
Bulk metallic glasses (BMGs) are amorphous alloys that can be formed into bulk samples rather than just thin films. This document discusses BMGs and characterizes a Zr-based BMG alloy. It describes experiments using 3-point bending and wedge indentation to study shear band formation. Wedge indentation showed vein-like structures and shear bands initiating and propagating with increasing load. Nanoindentation found fracture surfaces weaker than the bulk. Finite element modeling used cohesive zone elements to simulate shear band propagation. Future work includes gradient plasticity modeling of nucleation and shear band effects.
Dierk Raabe D P Steel R X& G G 2010 Sheffield
The document summarizes research on the microstructure evolution during recrystallization of dual-phase steels. Key points include:
- Experiments were conducted on hot-rolled and cold-rolled dual-phase steel compositions with varying annealing temperatures, times, and cooling/heating rates.
- Microstructure and texture were characterized through electron backscatter diffraction and scanning electron microscopy. Recrystallization and phase transformations were studied through thickness.
- Numerical simulations were also used to model recrystallization, forming processes, and yield surfaces to complement experimental findings.
- The competition between recrystallization and phase transformations, and their effect on microstructure, texture, and retained austenite fraction were
TRIBOLOGICAL STUDY OF TI3SIC2.pptx
[CR4102] Tribology Assignment-118CR0129
Tribological study of a ternary carbide namely Ti3SiC2, a thermodynamically stable laminates, exhibits both Metallic and Ceramic features.
Here we discussed about the properties, structure, R-curve, fretting and tribological behavior of Ti3SiC2 by taking references from various frontline researchers.
WCCM11 BMG experiments and modelling
This document discusses bulk metallic glasses (BMGs). It begins by defining BMGs as amorphous materials that were first produced in 1957 through rapid quenching. BMGs have high strength, stiffness, and elastic strain compared to conventional metals. The document then discusses experiments conducted to characterize the mechanical properties and deformation behavior of a Zr-based BMG, including 3-point bending tests, nanoindentation, and wedge indentation. Wedge indentation allowed visualization of shear bands initiating and propagating on the surface. Finite element modeling was also used to model the wedge indentation experiments and simulate shear band nucleation and damage propagation.
HexMat_Workshop_TJun_Poster_v2
- In-situ micropillar compression and HR-EBSD studies were used to investigate deformation in dual-phase Ti alloys. Pillars containing both α and β phases were compressed at a fixed strain rate.
- The results show that β phase morphology and α slip system significantly affect the local deformation process. An inclined β phase hindered primary α slip more than a vertical β phase, leading to more uniform stress distribution. Prism slip in α phase caused planar slip and GND release, while basal slip caused non-planar slip and greater stress localization.
- Understanding the interaction between α and β phases and how it influences dislocation evolution is critical for comprehending fatigue damage mechanisms in dual-
A study on influence of polarity on the machining characteristics of sinker edm
1. The study examines the effect of polarity on material removal rate, electrode wear, and surface roughness in electrical discharge machining of stainless steel.
2. Experiments were conducted using straight and reverse polarity at various currents. Reverse polarity and higher currents produced higher material removal rates but lower surface quality.
3. Straight polarity produced lower material removal rates but better surface finish. The results indicate that polarity and current setting have significant effects and can be optimized based on priorities for material removal rate versus surface roughness.
A Review Study of Investigation on Titanium Alloy Coatings for Wear Resistanc...
This document summarizes a review study investigating titanium alloy coatings deposited via physical vapor deposition (PVD) for improved wear resistance. PVD was identified as a cost-effective coating method that provides benefits like superior wear and corrosion resistance as well as low friction. The coatings were deposited on mild steel substrates for pump shaft applications. Characterization techniques like X-ray diffraction and ball-on-disc testing were used to analyze the coatings. The literature review discussed various coating materials, deposition methods, and experimental factors related to evaluating PVD coatings for wear resistance.
Structure, microstructure and dielectric study of (ba0.6 sr0.4)(zr0.6ti0.4)o3...
Structure, microstructure and dielectric study of (ba0.6 sr0.4)(zr0.6ti0.4)o3...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.Mechanism of Fracture in Friction Stir Processed Aluminium Alloy
Aluminium alloys are used for important
applications in reducing the weight of the component and
structure particularly associated with transport, marine,
and aerospace fields. Grain refinement by scandium (Sc)
addition can eliminate the casting defects and increase the
resistance to hot tearing for high strength aluminium alloys.
FSP for cast aluminium alloys have been focused and it has
great advantages including solid state microstructural
evolution, altering mechanical properties by optimizing
process parameters. These parameters are tool rotational
speeds (720, and 1000 rpm), traverse speeds (80, and 70
mm/min), and axial compressive force at 15 kN, etc. The
mechanical properties had been evaluated on FSPed
aluminium alloy with different microstructural conditions.
Fracture properties of aluminium alloys are very important
for industrial applications. Tensile and fracture toughness
properties were correlated to microstructural and
fractographic features of the aluminium alloys need to
explore their essential failure mechanisms.
INTERFACIAL STRESS ANALYSIS OF EXTERNALLY PLATED RC BEAMS
has become a popular retrofit method due to its rapid, simple and other advantages. However, debonding along the
Steel-RC beam interface can lead to premature failure of the structures. The interfacial stresses play a significant role
in understanding this premature debonding failure of such repaired structures. This paper presents a careful finite
element investigation into interfacial stresses in the adhesive layer bonding RC beam and soffit plate. Finite element
modelling issues like proper selection of contact between adherents and symmetry conditions are first
discussed, with particular attention on appropriate finite element meshes for the accurate determination of interfacial
stresses. The interfacial stress behaviour at plate end has been analysed for two cases of loading taken one by applying
uniformly distributed load and the other with a two point loading. Two special cases are considered in two point
loading – for the cases when the plate terminates with-in the constant moment region (CMR) and for the case when
plate is extended beyond constant moment region where bending moment is minimal. The interfacial stresses are
increasing with a reduction in adhesive layer thickness where as the stresses are increasing with the increase in soffit
plate thickness. Carbon fibre reinforced polymer (CFRP) has shown a significant reduction in interfacial stresses
when compared to steel plate. The interfacial stresses for the plate restricted within the constant moment region are very
high near the plate end leading to flexural debonding compared to the case where plate is extended beyond constant
moment region where bending moment is minimal. The concentration of stresses in the adhesive layer near the plate
end explained the significance in considering their influence in flexural debonding.
INTERFACIAL STRESS ANALYSIS OF EXTERNALLY PLATED RC BEAMS
Strengthening reinforced concrete (RC) beams by bonding steel or fibre reinforced polymer (FRP) on its tension face
has become a popular retrofit method due to its rapid, simple and other advantages. However, debonding along the
Steel-RC beam interface can lead to premature failure of the structures. The interfacial stresses play a significant role
in understanding this premature debonding failure of such repaired structures. This paper presents a careful finite
element investigation into interfacial stresses in the adhesive layer bonding RC beam and soffit plate. Finite element
modelling issues like proper selection of contact between adherents and symmetry conditions are first
discussed, with particular attention on appropriate finite element meshes for the accurate determination of interfacial
stresses. The interfacial stress behaviour at plate end has been analysed for two cases of loading taken one by applying
uniformly distributed load and the other with a two point loading. Two special cases are considered in two point
loading – for the cases when the plate terminates with-in the constant moment region (CMR) and for the case when
plate is extended beyond constant moment region where bending moment is minimal. The interfacial stresses are
increasing with a reduction in adhesive layer thickness where as the stresses are increasing with the increase in soffit
plate thickness. Carbon fibre reinforced polymer (CFRP) has shown a significant reduction in interfacial stresses
when compared to steel plate. The interfacial stresses for the plate restricted within the constant moment region are very
high near the plate end leading to flexural debonding compared to the case where plate is extended beyond constant
moment region where bending moment is minimal. The concentration of stresses in the adhesive layer near the plate
end explained the significance in considering their influence in flexural debonding.
Keywords-- Interfacial stresses, flexural debonding, constant moment region, soffit plate, finite element method.
Analysis of Machining Characteristics of Cryogenically Treated Die Steels Usi...
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
International Journal of Modern Engineering Research (IJMER) covers all the fields of engineering and science: Electrical Engineering, Mechanical Engineering, Civil Engineering, Chemical Engineering, Computer Engineering, Agricultural Engineering, Aerospace Engineering, Thermodynamics, Structural Engineering, Control Engineering, Robotics, Mechatronics, Fluid Mechanics, Nanotechnology, Simulators, Web-based Learning, Remote Laboratories, Engineering Design Methods, Education Research, Students' Satisfaction and Motivation, Global Projects, and Assessment…. And many more.
Presentation in euromat in sevilla 2013
The EUROMAT conferences have been held every two years since 1989, and have an increased record of bringing together up to 2000 researchers, scientists, trainees, and students from both academia and industry to discuss critical developments and perspectives in the field of materials science and technology and their applications. In 2015, the symposia within the conference will be grouped under the main headings: (A) Functional Materials, (B) Structural Materials, (C) Processing, (D) Characterization and Modelling, (E) Energy and Environment, and (F) Biomaterials and Healthcare, and there will be additional contributions on (G) Education, Technology Transfer and Strategic Materials.
Dislocation Density in Multicomponent Alloys CoNi, CoFeNi
This document discusses dislocation density in multi-component alloys CoNi and CoFeNi. It begins with an introduction to high entropy alloys and their properties. It then discusses the definition and calculation of dislocation density using X-ray diffraction peak broadening analysis. The document describes preparing CoNi, CoFeNi alloys by mechanical alloying and casting and characterizing the structural properties using X-ray diffraction to analyze dislocation density behavior.
Evaluation of fracture toughness of sintered silica nickel nanocomposites
The document evaluates the fracture toughness of silica-nickel nanocomposites using micro-Vickers indentation technique. It finds that fracture toughness increases with increasing nickel content. The Vickers indentation results in two types of cracks - Palmqvist cracks at low loads and median cracks at high loads. Equations are used to calculate fracture toughness values from the crack lengths and loads. The values range from 1.76 to 3.64 MPa√m and increase with nickel content and load, indicating that nickel improves fracture toughness of the silica composites.
IRJET- Examination of Hardness Values for Ti-6Al-4V Welded Specimens and Micr...
This document examines the hardness values and microstructural characterization of welded Ti-6Al-4V specimens. Hardness tests were conducted on different zones of welded specimens with different weld bead shapes. The fusion zone and heat-affected zone showed higher hardness than the base metal. Tensile tests revealed that specimens failed at the weld with a yield strength of 820 MPa and ultimate tensile strength of 890 MPa. Fractured surfaces were analyzed using scanning electron microscopy to understand failure modes. SEM images showed ductile failure with dimples in the base metal and no cracks in the welded region.
Modeling of Morphology and Deflection Analysis of Copper Alloys
This document discusses modeling the morphology and deflection analysis of copper alloys during thin wall machining. It presents an experimental investigation to determine optimal cutting conditions for machining thin walls of copper plates. The experiments used Taguchi methods to analyze the impact of cutting speed, feed rate, and depth of cut on surface roughness and part deflection. Analysis of variance (ANOVA) was then used to determine the correlation between these output responses and the cutting parameters, identifying the optimum conditions for thin wall machining of copper. The results showed that with appropriate process parameters, it is possible to end mill thin walls in copper as thin as 0.5mm with an aspect ratio of 48 and achieve a good surface finish and minimal deflection.
Microstructure design of steel for high creep resistance
In modern world the material has to be high creep resistance and high fatigue resistance. So, Design the material in such a way that material has to be high creep resistance and high fatigue resistance.
DLTS Study on interface of Si/TiO2
In this work, i have described the importance of TiO2 as a high dielectric material. Later the interface traps and their capture cross section were analyzed by DLTS.
Similar to EBSD Conference_Terry (20)
Free vibration investigation of thin plates under various circumstances using...
Free vibration investigation of thin plates under various circumstances using...
A study on influence of polarity on the machining characteristics of sinker edm
A study on influence of polarity on the machining characteristics of sinker edm
A Review Study of Investigation on Titanium Alloy Coatings for Wear Resistanc...
A Review Study of Investigation on Titanium Alloy Coatings for Wear Resistanc...
Structure, microstructure and dielectric study of (ba0.6 sr0.4)(zr0.6ti0.4)o3...
Structure, microstructure and dielectric study of (ba0.6 sr0.4)(zr0.6ti0.4)o3...
Mechanism of Fracture in Friction Stir Processed Aluminium Alloy
Mechanism of Fracture in Friction Stir Processed Aluminium Alloy
INTERFACIAL STRESS ANALYSIS OF EXTERNALLY PLATED RC BEAMS
INTERFACIAL STRESS ANALYSIS OF EXTERNALLY PLATED RC BEAMS
INTERFACIAL STRESS ANALYSIS OF EXTERNALLY PLATED RC BEAMS
INTERFACIAL STRESS ANALYSIS OF EXTERNALLY PLATED RC BEAMS
Analysis of Machining Characteristics of Cryogenically Treated Die Steels Usi...
Analysis of Machining Characteristics of Cryogenically Treated Die Steels Usi...
Dislocation Density in Multicomponent Alloys CoNi, CoFeNi
Dislocation Density in Multicomponent Alloys CoNi, CoFeNi
Evaluation of fracture toughness of sintered silica nickel nanocomposites
Evaluation of fracture toughness of sintered silica nickel nanocomposites
IRJET- Examination of Hardness Values for Ti-6Al-4V Welded Specimens and Micr...
IRJET- Examination of Hardness Values for Ti-6Al-4V Welded Specimens and Micr...
Modeling of Morphology and Deflection Analysis of Copper Alloys
Modeling of Morphology and Deflection Analysis of Copper Alloys
Microstructure design of steel for high creep resistance
Microstructure design of steel for high creep resistance
EBSD Conference_Terry
- 1. Methodology Micromechanical Deformation of Two-Phase Ti Alloys, Informed by EBSD Characterisation Tea-Sung (Terry) Jun*, Giorgio Sernicola, Vivian Tong, Fionn P E Dunne, T Ben Britton Department of Materials, Imperial College of London, Exhibition Road, London, SW7 2AZ, UK Motivation Results Key findings Acknowledgement ● Cold dwell fatigue has been a long-standing issue in aero-engine industry. ● Dwell susceptible alloys are those which suffer from a reduction in the life due to the inclusion of a short load-hold (~120s) in fatigue. ● This could be either be a chemical, structural or morphological effect due to difference in β-phase volume fraction and local chemistry. ● As dwell includes a time-dependant holding step, rate sensitivity and the resultant load shedding are clearly crucial factors in the dwell phenomenon. Ti-6Al-2Sn-4Zr-2Mo(dwell sensitive) Ti-6Al-2Sn-4Zr-6Mo(not dwell sensitive) EBSD orientation maps observed with respect to normal to the forging direction Aims ● To develop a methodology for investigating micromechanics of two-phase materials ● To study a local deformation mechanism of two-phase Ti624x (x=2 and 6 Mo) ● To understand the effect of α/β morphology on σ-ε behaviour ● To measure micromechanical rate sensitivity (left) ‘Rogue’ grain combination and (right) the resultant stress variation along the path A-A′ [1] 1. Material processing ○ Create large α-lamellar separated by thin β- ligaments, to make micropillars of α-β-α structure 2. EBSD mapping (Bruker) 3. Regions of Interests (ROIs) 4. FIB – micropillar fabrication 5. SEM/Alemnis in-situ compression front back side1 side2 ○ Square pillar: easy slip trace analysis, In-situ HR-EBSD ○ Find comparable grains between Ti6242&6 by comparing misorientation and Schmid factor(M) Large EBSD map of α phase β-reconstruction [2] Smaller EBSD map of α/β phase and EBSD Characterisation We are grateful to the Engineering and Physical Science Research Council for funding through HexMat (EP/K034332/1). Contact ▪ Email: t.jun@imperial.ac.uk (or terryjun83@gmail.com) ▪ http://www3.imperial.ac.uk/engineeringalloys ▪ http://www3.imperial.ac.uk/hexmat Morphology Effects Local Deformation Behaviour Rate Sensitivity Ti6242 Ti6246 ○ Pillars from Ti6242-A1: same α orientation, same strain rate (1.2x10-3s-1), various β morphology ○ Pillar details: a top width of 2µm, an aspect ratio of 1.9:1~2.2:1 and taper angle of ~5.5° Similar β morphology Different β morphology Slip System Primary slip Mode SF(A2) SF(B2) Basal (0001)<11-20> B1 0.101 0.087 B2 0.461 0.432 B3 0.361 0.345 Prismatic {10-10}<11-20> P1 0.188 0.147 P2 0.111 0.091 P3 0.077 0.056 Slip System Primary slip Mode SF(A3) SF(B3) Basal (0001)<11-20> B1 0.068 0.052 B2 0.023 0.019 B3 0.046 0.033 Prismatic {10-10}<11-20> P1 0.493 0.488 P2 0.306 0.334 P3 0.186 0.154 Schmid Factors (A2 & B2) Schmid Factors (A3 & B3) α[197,20,157] β[296,36,30] A1 8µm 30µm 30µm 30µm 30µm α[20,38,318] β[302,37,30] α[125,86,229] β[229,19,121] α[117,87,231] Β[249,4,92] α[19,33,319] Β[149,17,217] A2 A3 B3 B2 300µm Strain Rate Sensitivity exponent:Basal slip Prism slip Side2view Front view Loading Ti6242-A2 Side2 Ti6246-B2 Side2 Ti6242-A3 Ti6246-B3 Front Front Slip trace analysis on deformed pillars: yellow and blue arrows indicate primary and secondary slip system, respectively, anticipated from Schmid factor calculation σ-ε responseB P B B P P ● Combination of EBSD, FIB and Nanoindenter is an effective tool to investigate micromechanical deformation of two-phase materials. ● EBSD was effectively used to select individual slip systems. ● Both Ti6242 and Ti6246 are rate-sensitive : Ti6242 as a slip system dependent and Ti6246 as a slip system independent rate sensitive. Engineering Stress vs. Engineering Strain in Ti6242(A2,A3) and Ti6246(B2,B3) Experiments: displacement control, strain rates of 1.5x10-4s-1 ~ 1.0x10-2s-1 Large EBSD maps on Ti6242 and Ti6246, including smaller maps of ROIs: A1 for morphology study and A2-B2 & A3-B3 have comparable α crystal structure 200µm 60µm Experimental setup of pillar compression using 10µm dia. flat punch tip Micropillar fabricated using Helios Nanolab focused ion beam (FIB) with an aid of a script created by AutoScriptTM ▪ Similar β morphology, similar σ-ε response in elastic and early stage of plastic regime ▪ Schmid’s law works well to anticipate local deformation behaviour ▪ Quite different σ-ε responses in basal/prism slip in Ti6242, but similar in Ti6246 B B P P Strain Rate (έ) vs. Flow Stress (at ε=0.5) in log-log form ▪ Ti6242: different m values with respect to activated slip system ▪ Ti6246: similar m values regardless of activated slip system References [1] D.L. McDowell and F.P.E. Dunne (2010) Int J Fatigue, [2] Courtesy of Prof. Bradley P Wynne (Univ. of Sheffield) Load