This work aims to identify orthotropic linear elastic constitutive parameters of Pinus pinaster Ait. wood through the Finite Element Model Updating (FEMU) methodology. The approach is validated using both FE and synthetic image data. In the latter, digital image correlation is carried out on synthetic images deformed according to a 2D FE model. A systematic comparison is carried out. The identifiability for the four orthotropic material parameters on the radial-tangential (RT) plane is discussed regarding robustness and relative errors.
Identification of orthotropic elastic properties of wood by digital image cor...Vform Xsteels
Wood and wood-based products have been gathering relevance across the globe due to policies of sustainability and green economy. Wood can be modelled as a hierarchical material. Despite the mechanical characterization of several major species at the macro and structural scales, information addressing material properties at the mesoscale of the annual growth rings is still very scarce in the literature.
Recommendation engine and uncertainty techniques for the efficient calibratio...Vform Xsteels
Nowadays, digitalisation and virtualisation are the keys for companies’ success and competitiveness. Thus, numerical simulation tools are essential for engineering analysis and development. The success of a simulated material behaviour prediction depends on the chosen complex constitutive model and the correctness of its parameter identification. These days, it is used several classical mechanical tests to identify the model’s parameters.
Design and validation of a heterogeneous interior notched specimen for materi...Vform Xsteels
Currently, virtual manufacturing and simulation predictions are crucial in the design and development of engineering parts. However, its reliability largely depends on the adopted constitutive model and accuracy of the governing material parameters. A complex and robust phenomenological constitutive model requires the calibration of many parameters. This is a very time-consuming task, particularly when using classical procedures, which involves many homogeneous mechanical experiments and high costs.
Design of novel heterogeneous thermomechanical tests using topology-based opt...Vform Xsteels
Nowadays, the development and design of new mechanical parts are performed using virtual manufacturing tools. For this purpose, numerical simulation software uses complex material constitutive models to reproduce real material behavior. However, the reliability of the simulation’s results is conditioned by the accuracy of the input data. The calibration of material models depends on a proper material characterization, which turns to be expensive due to the required large number of mechanical tests.
IDENTIFICATION OF SWIFT LAW PARAMETERS USING FEMU BY A SYNTHETIC IMAGE DIC-BA...vformxsteels
ESAFORM 2022
J. Henriquesa,*, M. Condea
, A. Andrade-Camposa
, J. Xavierb
*Corresponding author: joaodiogofh@ua.pt
aTEMA, Department of Mechanical Engineering, University of Aveiro, Campus Universitário de Santiago,
3810-193 Aveiro, Portugal
bUNIDEMI, Department of Mechanical and Industrial Engineering, NOVA School of Science and Technology,
NOVA University Lisbon, 2829-516 Caparica, Portugal
IDENTIFICATION OF SWIFT LAW PARAMETERS USING FEMU BY A SYNTHETIC IMAGE DIC-BA...vformxsteels
25th International Conference on Material Forming
Braga, Portugal, 27-29 April 2022
J. Henriquesa,*, M. Condea
, A. Andrade-Camposa
, J. Xavierb
*Corresponding author: joaodiogofh@ua.pt
aTEMA, Department of Mechanical Engineering, University of Aveiro, Campus Universitário de Santiago,
3810-193 Aveiro, Portugal
bUNIDEMI, Department of Mechanical and Industrial Engineering, NOVA School of Science and Technology,
NOVA University Lisbon, 2829-516 Caparica, Portugal
Parameter Identification of Swift law using a FEMU-based approach and an inno...vformxsteels
ESAFORM 2022
M. Conde1, J. Henriques1,
S. Coppieters2, A. Andrade-Campos1
1 TEMA, Department of Mechanical Engineering, University of Aveiro, Portugal
2 Department of Materials Engineering, Ghent Technology Campus, KU Leuven, Belgium
Identification of orthotropic elastic properties of wood by digital image cor...Vform Xsteels
Wood and wood-based products have been gathering relevance across the globe due to policies of sustainability and green economy. Wood can be modelled as a hierarchical material. Despite the mechanical characterization of several major species at the macro and structural scales, information addressing material properties at the mesoscale of the annual growth rings is still very scarce in the literature.
Recommendation engine and uncertainty techniques for the efficient calibratio...Vform Xsteels
Nowadays, digitalisation and virtualisation are the keys for companies’ success and competitiveness. Thus, numerical simulation tools are essential for engineering analysis and development. The success of a simulated material behaviour prediction depends on the chosen complex constitutive model and the correctness of its parameter identification. These days, it is used several classical mechanical tests to identify the model’s parameters.
Design and validation of a heterogeneous interior notched specimen for materi...Vform Xsteels
Currently, virtual manufacturing and simulation predictions are crucial in the design and development of engineering parts. However, its reliability largely depends on the adopted constitutive model and accuracy of the governing material parameters. A complex and robust phenomenological constitutive model requires the calibration of many parameters. This is a very time-consuming task, particularly when using classical procedures, which involves many homogeneous mechanical experiments and high costs.
Design of novel heterogeneous thermomechanical tests using topology-based opt...Vform Xsteels
Nowadays, the development and design of new mechanical parts are performed using virtual manufacturing tools. For this purpose, numerical simulation software uses complex material constitutive models to reproduce real material behavior. However, the reliability of the simulation’s results is conditioned by the accuracy of the input data. The calibration of material models depends on a proper material characterization, which turns to be expensive due to the required large number of mechanical tests.
IDENTIFICATION OF SWIFT LAW PARAMETERS USING FEMU BY A SYNTHETIC IMAGE DIC-BA...vformxsteels
ESAFORM 2022
J. Henriquesa,*, M. Condea
, A. Andrade-Camposa
, J. Xavierb
*Corresponding author: joaodiogofh@ua.pt
aTEMA, Department of Mechanical Engineering, University of Aveiro, Campus Universitário de Santiago,
3810-193 Aveiro, Portugal
bUNIDEMI, Department of Mechanical and Industrial Engineering, NOVA School of Science and Technology,
NOVA University Lisbon, 2829-516 Caparica, Portugal
IDENTIFICATION OF SWIFT LAW PARAMETERS USING FEMU BY A SYNTHETIC IMAGE DIC-BA...vformxsteels
25th International Conference on Material Forming
Braga, Portugal, 27-29 April 2022
J. Henriquesa,*, M. Condea
, A. Andrade-Camposa
, J. Xavierb
*Corresponding author: joaodiogofh@ua.pt
aTEMA, Department of Mechanical Engineering, University of Aveiro, Campus Universitário de Santiago,
3810-193 Aveiro, Portugal
bUNIDEMI, Department of Mechanical and Industrial Engineering, NOVA School of Science and Technology,
NOVA University Lisbon, 2829-516 Caparica, Portugal
Parameter Identification of Swift law using a FEMU-based approach and an inno...vformxsteels
ESAFORM 2022
M. Conde1, J. Henriques1,
S. Coppieters2, A. Andrade-Campos1
1 TEMA, Department of Mechanical Engineering, University of Aveiro, Portugal
2 Department of Materials Engineering, Ghent Technology Campus, KU Leuven, Belgium
Parameter Identification of Swift law using a FEMU-based approach and an inno...vformxsteels
ESAFORM 2022
M. Conde1, J. Henriques1,
S. Coppieters2, A. Andrade-Campos1
1 TEMA, Department of Mechanical Engineering, University of Aveiro, Portugal
2 Department of Materials Engineering, Ghent Technology Campus, KU Leuven, Belgium
Recent Developments in Computational Methods for the Analysis of Ducted Prope...João Baltazar
This paper presents an overview of the recent developments at IST and MARIN in applying computational methods for the hydrodynamic analysis of ducted propellers. The developments focus on the propeller performance prediction in open water conditions using Boundary Element Methods and Reynolds-averaged Navier-Stokes solvers. The paper starts with an estimation of the numerical errors involved in both methods. Then, the different viscous mechanisms involved in the ducted propeller flow are discussed and numerical procedures for the potential flow solution proposed. Finally, the numerical predictions are compared with experimental measurements.
Recent Developments in Computational Methods for the Analysis of Ducted Prope...João Baltazar
This paper presents an overview of the recent developments at IST and MARIN in applying computational methods for the hydrodynamic analysis of ducted propellers. The developments focus on the propeller performance prediction in open water conditions using Boundary Element Methods and Reynolds-averaged Navier-Stokes solvers. The paper starts with an estimation of the numerical errors involved in both methods. Then, the different viscous mechanisms involved in the ducted propeller flow are discussed and numerical procedures for the potential flow solution proposed. Finally, the numerical predictions are compared with experimental measurements.
Definition and Validation of Scientific Algorithms for the SEOSAT/Ingenio GPPEsri
Presentation by Eduardo de Miguel, Raúl Valenzuela, Teodoro Bernardino, Verena Rodríguez, Alberto Pizarro, Diana de Miguel and Severino Fernández from INTA, GMV and EADS-CASA made on Esri European User Conference 2011.
Neuromorphic Engineering is the new branch developing too much.Temporal Contrast Vision Sensor is one of the methods for Contour detection for a moving object.
This presentation depicts my research and teching activities since the achievement of the PhD degree, and it is mainly based on the talk I gave to defend my HDR (Habilitation à Diriger des Recherches)
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.
Recent advances in diagnosis & treatment plsning /certified fixed orthodonti...Indian dental academy
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.
Indian dental academy provides dental crown & Bridge,rotary endodontics,fixed orthodontics,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
0091-9248678078
On the power of virtual experimentation in MT2.0: a VFORM-xSteels outlookvformxsteels
Sam Coppieters, A. Gil Andrade-Campos et al.
MatchID Global User Meeting
On the power of virtual experimentation in MT2.0 : a VFORM outlook
22 February2023 | Southampton, UK
Captronic séminaire électronique imprimée - présentation cea techpolenumerique33
Captronic séminaire électronique imprimée - 20/09/2017 - Présentation du CEA TECH / Liten - En partenariat avec l’AFELIM (Association Française de l'Electronique Imprimée) et le soutien du Pôle Numérique de la CCI Bordeaux Gironde, Cap’tronic a organisé le mercredi 20 septembre dans les locaux de l’IMS à Talence, une rencontre autour de l' "électronique imprimée" afin de faire un tour d’horizon de la chaîne de valeur d'une filière dont le marché mondial est estimé à 330 milliards de dollars en 2027.
Usually, transducers implemented in infrasound sensor (microbarometer) are mainly composed of two associated elements. The first one converts the external pressure variation into a physical linear displacement. The second one converts this motion into an electrical signal. According to this configuration, MB3, MB2000 and MB2005 microbarometers are using an aneroid capsule for the first one, and an electromagnetic transducer (Magnet-coil or LVDT) for the second one.
CEA DAM (designer of MB series) and PROLANN / SEISMO WAVE (manufacturer and seller of MB3) have associated their expertise to design a new optical microbarometer:
We aim at thinking that changing the electromagnetic transducer by an interferometer is an interesting solution in order to increase the dynamic and the resolution of the sensor. Currently, we are exploring this way in order to propose a future optical microbarometer which will enlarge the panel of infrasound sensors.
First, we will present the new transducer principles, taking into account the aneroid capsule and the interferometer using integrated optics technology. More specifically, we will explain the operation of this optical technology, and discuss on its advantages and drawbacks.
Secondly, we will present the optical microbarometer in which the interferometer is positioned inside the aneroid capsule under vacuum. The adjustment of the interferometer position is a challenge we solved with a simple solution. The optical measurement is naturally protected from environmental disturbances. Four prototypes were manufactured in order to compare their performances, and also an optical digitizer specifically designed to record the four channels interferometer.
Finally, we will present the results we obtained with this sensor (sensitivity, self-noise, effect of environmental disturbance, etc) compared to those of a MB3 microbarometer, and discuss about the advantages of this new sensor.
Optimal Quality and Efficiency in Adaptive Live Streaming with JND-Aware Low ...Vignesh V Menon
Abstract: In HTTP adaptive live streaming applications, video segments are encoded at a fixed set of bitrate-resolution pairs known as bitrate ladder. Live encoders use the fastest available encoding configuration, referred to as preset, to ensure the minimum possible latency in video encoding. However, an optimized preset and optimized
number of CPU threads for each encoding instance may result in
(i) increased quality and (ii) efficient CPU utilization while encoding. For low latency live encoders, the encoding speed is expected to be more than or equal to the video framerate. To this light, this paper introduces a Just Noticeable Difference (JND)-Aware Low latency
Encoding Scheme (JALE), which uses random forest-based models to jointly determine the optimized encoder preset and thread count for each representation, based on video complexity features, the target encoding speed, the total number of available CPU threads, and the target encoder. Experimental results show that, on average, JALE yield a quality improvement of 1.32 dB PSNR and 5.38 VMAF points with the same bitrate, compared to the fastest preset encoding of the HTTP Live Streaming (HLS) bitrate ladder using x265 HEVC open-source encoder with eight CPU threads used for each
representation. These enhancements are achieved while maintaining the desired encoding speed. Furthermore, on average, JALE results in an overall storage reduction of 72.70 %, a reduction in the total number of CPU threads used by 63.83 %, and a 37.87 % reduction in the overall encoding time, considering a JND of six VMAF points.
Parameter Identification of Swift law using a FEMU-based approach and an inno...vformxsteels
ESAFORM 2022
M. Conde1, J. Henriques1,
S. Coppieters2, A. Andrade-Campos1
1 TEMA, Department of Mechanical Engineering, University of Aveiro, Portugal
2 Department of Materials Engineering, Ghent Technology Campus, KU Leuven, Belgium
Recent Developments in Computational Methods for the Analysis of Ducted Prope...João Baltazar
This paper presents an overview of the recent developments at IST and MARIN in applying computational methods for the hydrodynamic analysis of ducted propellers. The developments focus on the propeller performance prediction in open water conditions using Boundary Element Methods and Reynolds-averaged Navier-Stokes solvers. The paper starts with an estimation of the numerical errors involved in both methods. Then, the different viscous mechanisms involved in the ducted propeller flow are discussed and numerical procedures for the potential flow solution proposed. Finally, the numerical predictions are compared with experimental measurements.
Recent Developments in Computational Methods for the Analysis of Ducted Prope...João Baltazar
This paper presents an overview of the recent developments at IST and MARIN in applying computational methods for the hydrodynamic analysis of ducted propellers. The developments focus on the propeller performance prediction in open water conditions using Boundary Element Methods and Reynolds-averaged Navier-Stokes solvers. The paper starts with an estimation of the numerical errors involved in both methods. Then, the different viscous mechanisms involved in the ducted propeller flow are discussed and numerical procedures for the potential flow solution proposed. Finally, the numerical predictions are compared with experimental measurements.
Definition and Validation of Scientific Algorithms for the SEOSAT/Ingenio GPPEsri
Presentation by Eduardo de Miguel, Raúl Valenzuela, Teodoro Bernardino, Verena Rodríguez, Alberto Pizarro, Diana de Miguel and Severino Fernández from INTA, GMV and EADS-CASA made on Esri European User Conference 2011.
Neuromorphic Engineering is the new branch developing too much.Temporal Contrast Vision Sensor is one of the methods for Contour detection for a moving object.
This presentation depicts my research and teching activities since the achievement of the PhD degree, and it is mainly based on the talk I gave to defend my HDR (Habilitation à Diriger des Recherches)
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.
Recent advances in diagnosis & treatment plsning /certified fixed orthodonti...Indian dental academy
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.
Indian dental academy provides dental crown & Bridge,rotary endodontics,fixed orthodontics,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
0091-9248678078
On the power of virtual experimentation in MT2.0: a VFORM-xSteels outlookvformxsteels
Sam Coppieters, A. Gil Andrade-Campos et al.
MatchID Global User Meeting
On the power of virtual experimentation in MT2.0 : a VFORM outlook
22 February2023 | Southampton, UK
Captronic séminaire électronique imprimée - présentation cea techpolenumerique33
Captronic séminaire électronique imprimée - 20/09/2017 - Présentation du CEA TECH / Liten - En partenariat avec l’AFELIM (Association Française de l'Electronique Imprimée) et le soutien du Pôle Numérique de la CCI Bordeaux Gironde, Cap’tronic a organisé le mercredi 20 septembre dans les locaux de l’IMS à Talence, une rencontre autour de l' "électronique imprimée" afin de faire un tour d’horizon de la chaîne de valeur d'une filière dont le marché mondial est estimé à 330 milliards de dollars en 2027.
Usually, transducers implemented in infrasound sensor (microbarometer) are mainly composed of two associated elements. The first one converts the external pressure variation into a physical linear displacement. The second one converts this motion into an electrical signal. According to this configuration, MB3, MB2000 and MB2005 microbarometers are using an aneroid capsule for the first one, and an electromagnetic transducer (Magnet-coil or LVDT) for the second one.
CEA DAM (designer of MB series) and PROLANN / SEISMO WAVE (manufacturer and seller of MB3) have associated their expertise to design a new optical microbarometer:
We aim at thinking that changing the electromagnetic transducer by an interferometer is an interesting solution in order to increase the dynamic and the resolution of the sensor. Currently, we are exploring this way in order to propose a future optical microbarometer which will enlarge the panel of infrasound sensors.
First, we will present the new transducer principles, taking into account the aneroid capsule and the interferometer using integrated optics technology. More specifically, we will explain the operation of this optical technology, and discuss on its advantages and drawbacks.
Secondly, we will present the optical microbarometer in which the interferometer is positioned inside the aneroid capsule under vacuum. The adjustment of the interferometer position is a challenge we solved with a simple solution. The optical measurement is naturally protected from environmental disturbances. Four prototypes were manufactured in order to compare their performances, and also an optical digitizer specifically designed to record the four channels interferometer.
Finally, we will present the results we obtained with this sensor (sensitivity, self-noise, effect of environmental disturbance, etc) compared to those of a MB3 microbarometer, and discuss about the advantages of this new sensor.
Optimal Quality and Efficiency in Adaptive Live Streaming with JND-Aware Low ...Vignesh V Menon
Abstract: In HTTP adaptive live streaming applications, video segments are encoded at a fixed set of bitrate-resolution pairs known as bitrate ladder. Live encoders use the fastest available encoding configuration, referred to as preset, to ensure the minimum possible latency in video encoding. However, an optimized preset and optimized
number of CPU threads for each encoding instance may result in
(i) increased quality and (ii) efficient CPU utilization while encoding. For low latency live encoders, the encoding speed is expected to be more than or equal to the video framerate. To this light, this paper introduces a Just Noticeable Difference (JND)-Aware Low latency
Encoding Scheme (JALE), which uses random forest-based models to jointly determine the optimized encoder preset and thread count for each representation, based on video complexity features, the target encoding speed, the total number of available CPU threads, and the target encoder. Experimental results show that, on average, JALE yield a quality improvement of 1.32 dB PSNR and 5.38 VMAF points with the same bitrate, compared to the fastest preset encoding of the HTTP Live Streaming (HLS) bitrate ladder using x265 HEVC open-source encoder with eight CPU threads used for each
representation. These enhancements are achieved while maintaining the desired encoding speed. Furthermore, on average, JALE results in an overall storage reduction of 72.70 %, a reduction in the total number of CPU threads used by 63.83 %, and a 37.87 % reduction in the overall encoding time, considering a JND of six VMAF points.
Similar to Identification of orthotropic elastic properties of wood by a synthetic image approach based on digital image correlation (20)
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
NO1 Uk best vashikaran specialist in delhi vashikaran baba near me online vas...Amil Baba Dawood bangali
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Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Identification of orthotropic elastic properties of wood by a synthetic image approach based on digital image correlation
1. PhotoMechanics – iDICs conference 2021 | Nantes, France, 3-5 November 2021 J. Henriques, J. Xavier, A. Andrade-Campos
Identification of orthotropic elastic properties of wood by a
synthetic image approach based on digital image correlation
J. Henriquesa,*, J. Xavierb, A. Andrade-Camposa
*Corresponding author: joaodiogofh@ua.pt
aTEMA, Department of Mechanical Engineering, University of Aveiro, Campus Universitário de Santiago,
3810-193 Aveiro, Portugal
bUNIDEMI, Department of Mechanical and Industrial Engineering, NOVA School of Science and Technology,
NOVA University Lisbon, 2829-516 Caparica, Portugal
PhotoMechanics – iDICs 2021 conference
Nantes, France, 3-5 November 2021
2. PhotoMechanics – iDICs conference 2021 | Nantes, France, 3-5 November 2021 J. Henriques, J. Xavier, A. Andrade-Campos
Table of contents
2
Motivation and goals
Experimental tests
Methodology
Results and discussion
Conclusions and future work
1
2
3
4
5
3. PhotoMechanics – iDICs conference 2021 | Nantes, France, 3-5 November 2021 J. Henriques, J. Xavier, A. Andrade-Campos
Motivation and goals
3
1
Food and Agriculture Organization of the United Nations (FAO))Global demand for wood product
• Engineering materials based on
renewable and recyclable natural
resources are regaining popularity.
Koponen, S..The consequences of wood cellular structure
and rolling-shear in crossbanded veneer composites. (2005)
• Wood is a complex, heterogeneous and hierarchical biological material.
4. PhotoMechanics – iDICs conference 2021 | Nantes, France, 3-5 November 2021 J. Henriques, J. Xavier, A. Andrade-Campos
4
1
Marcia Argyriades, Metropol Parasol // The World’s Largest Wooden Structure
• The characterization of wood’s properties is critical to reproduce the material behaviour.
Motivation and goals
5. PhotoMechanics – iDICs conference 2021 | Nantes, France, 3-5 November 2021 J. Henriques, J. Xavier, A. Andrade-Campos
5
1
• Classical mechanical tests with punctual
measurements and simplified assumptions.
▪ Photomechanical approaches involving full-
field measurements coupled to inverse
identification techniques.
Motivation and goals
Optimized experimental images, MatchID: Metrology beyond colors.
6. PhotoMechanics – iDICs conference 2021 | Nantes, France, 3-5 November 2021 J. Henriques, J. Xavier, A. Andrade-Campos
6
1
Identify the linear elastic orthotropic constitutive
parameters of Pinus Pinaster Ait. using DIC and
FEMU using:
1. A single uniaxial compression test under quasi-
static loading conditions.
2. Using on-axis rectangular specimens oriented on
the radial-tangential plane.
3. And off-axis specimens at an orientation to the
grain of 60° (RT plane).
Motivation and goals
7. PhotoMechanics – iDICs conference 2021 | Nantes, France, 3-5 November 2021 J. Henriques, J. Xavier, A. Andrade-Campos
Experimental tests
7
2
▪ Pinus pinaster Ait. specimens:
Radial boards were initially cut and air-dried to a moisture
content of 12%.
Clear wood specimens manufactured on the RT
plane with nominal dimensions:
On-axis specimens: 20(R)×10(T)×4(L) mm3
Off-axis specimens: 20(R)×9 (T)×4(L) mm3
8. PhotoMechanics – iDICs conference 2021 | Nantes, France, 3-5 November 2021 J. Henriques, J. Xavier, A. Andrade-Campos
8
2
Testing
machine
Lightning
Optical system
(camera and lens)
Specimen
• Instron 5848 Microtester machine;
• Cross-head displacement of 0.5
mm/min;
• Load cell of 2 kN.
Compression tests and full-field
measurements:
Experimental tests
9. PhotoMechanics – iDICs conference 2021 | Nantes, France, 3-5 November 2021 J. Henriques, J. Xavier, A. Andrade-Campos
2D DIC – Optical system
Camera: Baumer Optronic FWX20
Lens: AF Micro-Nikkor 200mm f/4D ED-IF
Image resolution: 1624×1236 px2
Field of view: 21.5×16.5 mm2
Working distance: 721 mm
Image conversion factor: 0.0132 mm/px
Image acquisition rate: 1 Hz
Speckle pattern technique: Airbrush painting
Average speckle size: 2.69 px/0.036 mm | 4 px/0.053 mm
(On-axis | Off-axis)
DIC software: MatchID
9
2 Experimental tests
10. PhotoMechanics – iDICs conference 2021 | Nantes, France, 3-5 November 2021 J. Henriques, J. Xavier, A. Andrade-Campos
10
2 Experimental tests
DIC – Parametric analysis (On-axis)
Correlation settings of the parametric analysis
Subset size: {9-81 px}, 4 px increment
Step size: {5 px}, fixed
Shape function: {Affine, Quadratic}
Strain window size: {3-27}, 2 point increment
Strain interpolation: {Bilinear (Q4),
Biquadratic (Q8)}
Virtual strain gauge: {23-211 px 0.3-2.79 mm}
Strain convention: {Green-Lagrange}
12. PhotoMechanics – iDICs conference 2021 | Nantes, France, 3-5 November 2021 J. Henriques, J. Xavier, A. Andrade-Campos
12
3 Methodology
Finite element model
• Geometry constructed on experimental
images.
• Directly comparing FEA results with the
experimental DIC measurements involves
handling numerous inconsistencies.
Synthetic image generation
Solution
13. PhotoMechanics – iDICs conference 2021 | Nantes, France, 3-5 November 2021 J. Henriques, J. Xavier, A. Andrade-Campos
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3 Methodology
Finite element model
• Extrapolated boundary conditions:
- Considering the whole full-field
displacement measurements.
- Smoothed by a fourth-order
polynomial function.
14. PhotoMechanics – iDICs conference 2021 | Nantes, France, 3-5 November 2021 J. Henriques, J. Xavier, A. Andrade-Campos
3 Methodology
14
Synthetic image generation
15. PhotoMechanics – iDICs conference 2021 | Nantes, France, 3-5 November 2021 J. Henriques, J. Xavier, A. Andrade-Campos
Measurement points,
Finite element model updating
• Objective function:
• Strain term:
• Force term:
Weigthing Coeffiecient,
3 Methodology
15
16. PhotoMechanics – iDICs conference 2021 | Nantes, France, 3-5 November 2021 J. Henriques, J. Xavier, A. Andrade-Campos
3 Methodology
16
3
Optimization method:
• Nelder-Mead simplex method.
Weigthing Coeffiecient:
• WF = 10-1.
Initial parameters set:
• Reference Values.
17. PhotoMechanics – iDICs conference 2021 | Nantes, France, 3-5 November 2021 J. Henriques, J. Xavier, A. Andrade-Campos
4 Results and discussion
17
Method validation
ER ET νRT GRT
Reference parameters 1912 1010 0.586 176
Id. Value 1912 1010 0.586 176
Error (%) 0.000 0.000 0.000 0.000
Id. Value 1911.9 1010 0.586 176
Error (%) 0.005 0.000 0.000 0.000
Units: ER, ET , GRT: MPa
18. PhotoMechanics – iDICs conference 2021 | Nantes, France, 3-5 November 2021 J. Henriques, J. Xavier, A. Andrade-Campos
VSG ER ET νRT GRT
Reference parameters 1912 1010 0.586 176
0.752 1578.8 823.7 0.783 187.3
1.069 1548.5 981 0.775 122.2
1.993 1492.5 1384.1 0.758 125
0.937 521.5 418.2 0.679 161.7
1.254 741.7 508.2 0.624 163.4
1.993 3041.5 725.4 0.395 162.3
4 Results and discussion
18
Influence of the DIC settings on the identified parameters
Units: ER, ET , GRT: Mpa; VSG: mm
19. PhotoMechanics – iDICs conference 2021 | Nantes, France, 3-5 November 2021 J. Henriques, J. Xavier, A. Andrade-Campos
4 Results and discussion
19
Experimental and numerical full-field strain maps
22. PhotoMechanics – iDICs conference 2021 | Nantes, France, 3-5 November 2021 J. Henriques, J. Xavier, A. Andrade-Campos
5 Conclusions and future work
22
▪ In future work: a) Using heterogeneous experimental tests.
b) identification of heterogeneous properties of wood.
▪ The proposed identification methodology coupled to synthetic image construction was
successfully validated.
▪ The effect of the DIC parameters set seems to be higher on parameters that are less
sensitive to the experimental configuration used.
▪ Accurate identification of:
1. Three out of four RT linear elastic parameters when using on-axis specimens (ER, ET, νRT).
2. One out of four RT linear elastic when using the off-axis specimens (GRT).
23. PhotoMechanics – iDICs conference 2021 | Nantes, France, 3-5 November 2021 J. Henriques, J. Xavier, A. Andrade-Campos
Thank you!
J. Henriques*, J. Xavier, A. Andrade-Campos
* joaodiogofh@ua.pt
PhotoMechanics – iDICs 2021 conference
Nantes, France, 3-5 November 2021
The authors acknowledge Research Fund for Coal and Steel under grant agreement No 888153. The
authors also gratefully acknowledge Fundação para a Ciência e Tecnologia throughout the projects
PTDC/EME-APL/29713/2017, UID/EMS/00481/2013-FCT and UIDB/00667/2020 (UNIDEMI). J. Henriques
acknowledges Fundação para a Ciência e Tecnologia for the PhD grant 2021.05692.BD.
Acknowledgements
