This document summarizes research on compressive membrane action (CMA) in concrete decks. CMA occurs when edge restraint induces in-plane compressive forces, improving load capacity. The research investigates CMA in reinforced and prestressed concrete decks. Experimental data on reinforced decks matches CMA theories well. Tests on prestressed decks show improved punching shear capacity over reinforced decks. Future work will further investigate CMA in prestressed decks through additional testing.
Punching Shear Strength of Transversely Prestressed Concrete DecksSana'a Amir
This document discusses punching shear strength in transversely prestressed concrete bridge decks. It introduces compressive membrane action that occurs due to lateral restraint at slab edges, improving punching capacity. Existing research models for predicting capacity are described, including modified Hallgren and engineering methods. Future experiments are proposed to better understand the effects of transverse prestressing level, joint skewness, and loading position on punching strength accounting for compressive membrane action.
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This document describes a study comparing coupled and de-coupled dynamic analyses of an FPSO, its mooring lines, and risers. A coupled analysis considers the full interaction between the FPSO, moorings, and risers, while a de-coupled analysis analyzes them separately. The study finds that a coupled analysis more accurately captures damping effects, mean current loads, and the influence of moorings and risers on FPSO motions. It presents results of a case study comparing the two methods for an FPSO in the Campos Basin, finding differences in predicted offset, tension, and response.
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This document summarizes simulations of the thermo-mechanical characteristics of electron beam additive manufacturing (EBAM). A 3D finite element model was developed to investigate thermal response, residual stress, and deformation. The model considers conical heat flux, Gaussian intensity distribution, and linear heat decay. Temperature, stress, and deformation results are presented from simulations of single-line scans and multi-layer crossed raster patterns. Peak tensile stresses occur at the solidification front, and maximum deformation follows the beam path. Future work will focus on simulating hatch melting patterns.
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This document summarizes research on modeling the thermal effects of the electron beam additive manufacturing process, specifically how powder sintering affects temperature distribution and melt pool geometry. Key findings from simulations include higher temperatures and deeper melt pools with increasing powder porosity. Larger beam sizes produced shallower melt pools. Future work is proposed on modeling overhang structures, thermal effects at solid/powder interfaces, and thermo-mechanical analysis.
This document defines terminology related to soil, rock, and contained fluids. It was prepared jointly by the American Society of Civil Engineers and the American Society for Testing and Materials. The standard defines terms found in other standards issued by ASTM Committee D18 on Soil and Rock, including terms related to soil properties, soil classification, hydraulic properties, and aquifer testing.
The document provides standards and limits for physical, chemical, and mechanical properties of aggregates used in concrete construction. It includes permissible limits for properties like grading, clay/organic content, absorption, specific gravity, shape, chlorides, sulphates, strength and abrasion resistance. Routine test methods and frequencies are also defined to ensure aggregate quality is monitored and maintained during concrete works. Requirements for stone pitching and gabion construction are briefly outlined.
Punching Shear Strength of Transversely Prestressed Concrete DecksSana'a Amir
This document discusses punching shear strength in transversely prestressed concrete bridge decks. It introduces compressive membrane action that occurs due to lateral restraint at slab edges, improving punching capacity. Existing research models for predicting capacity are described, including modified Hallgren and engineering methods. Future experiments are proposed to better understand the effects of transverse prestressing level, joint skewness, and loading position on punching strength accounting for compressive membrane action.
2007 drilling drlg sym - optimizing bit performancefrancoiskdevos
This document discusses using mechanical specific energy (MSE) to optimize drilling performance. It defines MSE and provides the MSE equation. MSE can be used to determine optimal weight on bit and rotary speed through drill-off tests. Real-time MSE monitoring helps identify drilling inefficiencies and determine when to replace bits. Graphs of MSE trends over time help estimate bit wear and predict performance.
This document describes a study comparing coupled and de-coupled dynamic analyses of an FPSO, its mooring lines, and risers. A coupled analysis considers the full interaction between the FPSO, moorings, and risers, while a de-coupled analysis analyzes them separately. The study finds that a coupled analysis more accurately captures damping effects, mean current loads, and the influence of moorings and risers on FPSO motions. It presents results of a case study comparing the two methods for an FPSO in the Campos Basin, finding differences in predicted offset, tension, and response.
This document discusses advancements in tack coats, which are light applications of asphalt or emulsion used to bond new asphalt layers. It introduces a new type of tack coat called "trackless tack" that cures faster and does not track away from the application area. Trackless tack has been shown to improve bond strength between layers and allow for more consistent compaction, reducing cracking and other failures. Field tests found trackless tack increased bond strength by over 50% compared to traditional tack coats. The document recommends trackless tack for uses like open graded friction courses to improve their durability.
Simulations of Thermo-Mechanical Characteristics in Electron Beam Additive Ma...Ninggang Shen
This document summarizes simulations of the thermo-mechanical characteristics of electron beam additive manufacturing (EBAM). A 3D finite element model was developed to investigate thermal response, residual stress, and deformation. The model considers conical heat flux, Gaussian intensity distribution, and linear heat decay. Temperature, stress, and deformation results are presented from simulations of single-line scans and multi-layer crossed raster patterns. Peak tensile stresses occur at the solidification front, and maximum deformation follows the beam path. Future work will focus on simulating hatch melting patterns.
Thermal Modeling of Electron Beam Additive Manufacturing Process–Powder Sinte...Ninggang Shen
This document summarizes research on modeling the thermal effects of the electron beam additive manufacturing process, specifically how powder sintering affects temperature distribution and melt pool geometry. Key findings from simulations include higher temperatures and deeper melt pools with increasing powder porosity. Larger beam sizes produced shallower melt pools. Future work is proposed on modeling overhang structures, thermal effects at solid/powder interfaces, and thermo-mechanical analysis.
This document defines terminology related to soil, rock, and contained fluids. It was prepared jointly by the American Society of Civil Engineers and the American Society for Testing and Materials. The standard defines terms found in other standards issued by ASTM Committee D18 on Soil and Rock, including terms related to soil properties, soil classification, hydraulic properties, and aquifer testing.
The document provides standards and limits for physical, chemical, and mechanical properties of aggregates used in concrete construction. It includes permissible limits for properties like grading, clay/organic content, absorption, specific gravity, shape, chlorides, sulphates, strength and abrasion resistance. Routine test methods and frequencies are also defined to ensure aggregate quality is monitored and maintained during concrete works. Requirements for stone pitching and gabion construction are briefly outlined.
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This presentation is prepared and presented as a part of the final research project presentation at the University of Manitoba under the supervision of Dr. Ehab El-salakawy. This presentation is uploaded for the sole purpose of helping others interested in the research topic. However, plagiarism is highly prohibited. All rights are reserved.
The document is a final report from Group 72 for a speedboat to tugboat design challenge. It includes sections on constraints and specifications, concept generation, design choice, construction, testing and redesign. The group's design choice was to make the speedboat interchangeable with a tugboat configuration by adding a larger propeller with 4 blades of decreased pitch to increase thrust for tugging. Their goals were to improve battery life, stability, maneuverability, and tugging ability while staying within budget. They developed concepts like adding a second propeller, modifying the propeller blade angle, and protecting components from overheating or water damage. Their final design incorporated a 4-bladed propeller to increase thrust for tugboat functionality without significant
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The document discusses using artificial intelligence to accelerate materials science research through analysis of diffusion multiples. It describes how diffusion multiples can be used to (1) map phase diagrams by studying interdiffusion at phase interfaces, (2) examine precipitation kinetics and microstructures, and (3) measure and map material properties like thermal conductivity. The document argues that artificial intelligence and automation are needed to analyze the large amounts of data generated from diffusion multiples and help accelerate materials design.
This document presents an automated finite element methodology for hull girder progressive collapse analysis. It describes using a nonlinear finite element method (NLFEM) to model the buckling and collapse of a ship hull subjected to longitudinal bending loads. An automated approach is proposed to generate finite element models of hull girder sections using "building block" components and apply geometric imperfections. A case study applies the methodology to a 1/3 scale frigate model and compares the NLFEM results to experimental test data, finding close correlation. The automated approach is concluded to improve the usability of NLFEM in practical ship design situations.
Turning Sense in Dollars: Advances in HYdrualic Fracture Design within Full F...Arif Khan
1) The document discusses numerical modeling approaches for hydraulic fracturing design within full field models.
2) It outlines the limitations of traditional analytical fracture modeling and highlights advantages of numerical modeling, such as accounting for geological heterogeneity, reservoir architecture, depletion and injection effects on fracture behavior over time.
3) The document presents a case study where various fracture scenarios for a well candidate are modeled using a new approach of unstructured local grid refinement within the existing full field model, allowing spherical flow modeling at fracture tips and integrated workflow to rank fracture candidates.
This dissertation examines the design of lightweight steel sandwich panels with integrated structural and thermal insulating performance for use as residential roofing. The author develops models for predicting the shear buckling strength and bearing failure of thin steel webs embedded in polymer foam cores. Finite element analysis and prototype testing are used to validate the models. Design procedures are presented for determining optimal panel geometry based on thermal performance, strength, and deflection requirements for different climate zones. Minimum weight designs are developed and compared for panels using carbon steel, stainless steel, and two-layer panel configurations.
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This document summarizes a thesis analyzing the static and dynamic finite element analysis of a composite leaf spring. The thesis examines a fiberglass-epoxy composite leaf spring used in a Chevrolet vehicle and explores its performance under heavier loads. Analytical calculations and FEA simulations are used to analyze stresses in the leaf spring and identify failures from increased loading. The results suggest reducing leaf spring thickness to lower delamination stresses at the mid-section from dynamic loading. Experimental validation and further studies of hybrid composites and eye-end design are recommended for future work.
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This document analyzes the unit shaft friction and adhesion factor (α) for piles constructed using the Continuous Flight Auger (CFA) technique in the London Clay Formation. Six sites were selected where CFA piles were constructed in similar geological conditions and where pile load test and ground investigation data was available. At one site with three piles, back analysis using the Chin and CEMSET methods obtained a unit shaft friction in the London Clay Formation ranging from 124.6 to 143.4 kPa and adhesion factors ranging from 0.5 to 0.7. Overall, average unit shaft friction across all sites ranged from 73.0 to 143.4 kPa with an average of 118.2 kPa, and average adhesion factors ranged
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This document provides product information for Watershell storm water management modules. It describes the specifications of various module sizes ranging from 4-20 cm in height. Application examples are given such as for infiltration fields, root bridges, and drainage. Support services during design stages are also offered. Specifications are subject to change as products continue to be developed.
Seismic optimization of an I shaped shear link damper in EBF and CBF systemsIRJET Journal
This document summarizes a study that analyzes the seismic performance of concentrically braced frames (CBF) and eccentrically braced frames (EBF) with different sizes of I-shaped shear link dampers through numerical modeling and pushover analysis. The study found that a CBF fitted with a 300x15x25 mm I-shaped damper showed the best performance in terms of maximum load capacity and ductility. Compared to an unbraced frame or CBF without a damper, the optimally sized damper significantly improved the seismic energy dissipation capacity and resilience of both CBF and EBF systems.
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Ferro cement
The term Ferro cement is most commonly applied to a mixture of Portland cement and sand applied over layers of woven or expanded steel mesh and closely spaced small-diameter steel rods. It can be used to form relatively thin, compound curved sheets to make hulls for boats, shell roofs, water tanks, etc. It has been used in a wide range of other applications including sculpture and prefabricated building components. The term has been applied by extension to other composite materials including some containing no cement and no ferrous material. These are better referred to by terms describing their actual contents.
This document summarizes centrifuge tests performed to measure the bearing capacity of shallow foundations under combined lateral and axial loads. The tests used a 1/36th scale model in a geotechnical centrifuge with a medium dense and very dense soil. Foundations with varying embedment and loading conditions were tested. Load vs. displacement curves showed the bearing capacity increased with denser soil and greater embedment. Analysis of a bearing capacity factor found existing methods sometimes overestimated values compared to measurements. The centrifuge tests provided data on the influence of combined loads on shallow foundations.
MSEC 2015_Review on powder bed laser additive manufacturing of inconel 718 partsXiaoqing Wang
Full Paper:
Xiaoqing Wang, Xibing Gong, Kevin Chou, Review on powder-bed laser additive manufacturing of Inconel 718 parts, Proc. Inst. Mech. Eng. Part B J. Eng. Manuf. 231 (2017) 1890–1903. doi:10.1177/0954405415619883.
Available at: http://www.academia.edu/29967012/Review_on_powder-bed_laser_additive_manufacturing_of_Inconel_718_parts
1) The document describes determining the forming limit diagram (FLD) for stainless steel 304 experimentally using hemispherical dome tests and validating it using computer simulation with HyperForm 11.0.
2) Tensile properties were obtained from uniaxial tensile testing and grid-marked samples were dome tested to failure to experimentally generate the FLD. A typical industrial component was also simulated in HyperForm.
3) The results of the experimental and HyperForm FLDs showed good agreement within 12.5% difference, validating the use of computer simulation to predict forming limits. Using HyperForm eliminated material waste and reduced lead times compared to experimental determination.
Design of prestressed Concrete flat slabs.pdf
The South African Institution of Civil Engineering
Postnet- Suite 81
Private bag X65
Halfway House 1685
South Africa
This Report is intended to serve as a manual of good practice for the design of prestressed concrete flat slabs..
In addition to the recommended procedures, other methods are described for the sake of completeness and to compare
different methods of design.
The Report was produced by a sub-committee of the Joint Structural Division of the South African Institution of Civil
Engineers, and the Institution of Structural Engineers.
PRESTRESSED CONCRETE FLAT SLABS
1.0 Introduction
In 1989 the Structural Division of the South African Institution of Civil Engineers created a sub-committee to examine
the design of prestressed concrete flat slabs. It was found that a certain amount of poor design was prevalent, and the
committee decided to produce a booklet of recommendations for good practice.
The matter was considered especially important because the South African Loading Code was changed with effect from
1990, and the required factor on D.L. is now 1.2, whereas it was previously 1.4. This has the effect of reducing
reinforcement areas, and cracking and deflection require more attention. To make allowance for this, SABS 0100 was
revised, and among other changes, the allowable concrete shear stress was reduced by 10 percent, to lessen the probability
of brittle shear failures.
1.1 Flat Slabs
Flat slabs were originally invented in the USA at the beginning of this century, and there were a number of patented
systems.
The early reinforced concrete flat slabs all had drops, and columns with capitals, and were considered to be the structure
of choice for warehouse construction and heavy loads. Because of the columns capitals and drops, shear was not really a
problem.
Design was based on tests on stresses in reinforcement at working loads, and the early codes required a total moment in
a span of WL2/11.
It was realized that statically a total moment of about WL2/8 was required for equilibrium, (If the column diameter is D,
the statically required moment is (very closely) W(L-2D/3)2/8 where L-2D/3 is the effective span. The difference between
WL2/11 and WL2/8 was attributed to a mystical '2 way action'. In fact it was due partly to tensile stresses in the concrete
and partly to arching effects reducing the measured stress in the reinforcement.
The philosophy, and the empirical coefficients, persisted until the 1950's when the allowable stresses in reinforcement
were increased, limit state design was introduced, and the statically required moment of WL2/8 was introduced into the
codes. This was because it was felt that it was not safe to rely on arching or tensile strength of the concrete. In addition
to the changed moment coefficients, the frame method of analysis was required in certain cases.
1.2 Flat Plates
Flat plates were subsequently developed, with no drops and no column capitals/
This document outlines the design of a frame to support a 45kN load 2m above an object. The frame design was developed in Dr Frame 3D software. Calculations were provided to analyze the design for buckling, bending, welding, and fastening. For buckling, the factor of safety was 11.08. For bending, the factor of safety was 1.95. Welding and fastening calculations determined minimum weld and bolt sizes of 10mm would be required. While initial values met requirements, improvements could be made to the design.
FINITE ELEMENT MODELING, ANALYSIS AND VALIDATION OF THE FLEXURAL CAPACITY OF ...Sadia Mitu
This document presents research on modeling the flexural capacity of steel fiber reinforced concrete (SFRC) beams. It describes an experimental program that tested RC beams with different steel fiber aspect ratios. A finite element analysis was conducted using ANSYS to model the beams. The FE models were validated by comparing their load-deflection behavior and failure patterns to the experimental test results. The research found that adding steel fibers increased the beams' compressive strength, tensile strength, flexural strength, and ductility. The validated FE models can help predict the performance benefits of using SFRC in construction.
The document describes 7 examples of designing steel frames using SAP2000. Example 1 analyzes a column using both frame and shell finite element models in SAP2000, finding the shell models more accurately consider shear flexibility. Example 2 analyzes a beam, with shell models again more accurate by including shear and local/distortional effects. Example 3 analyzes a beam-column, showing shell models provide more accurate buckling loads than formulas alone by including shear and joint geometry. Overall, the examples illustrate how SAP2000 tools can be used to both check and optimize steel frame designs according to Eurocode 3, and that shell models tend to provide more accurate analyses and results compared to frame models or formulas alone.
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Turning Sense in Dollars: Advances in HYdrualic Fracture Design within Full F...Arif Khan
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Design of prestressed Concrete flat slabs.pdf
The South African Institution of Civil Engineering
Postnet- Suite 81
Private bag X65
Halfway House 1685
South Africa
This Report is intended to serve as a manual of good practice for the design of prestressed concrete flat slabs..
In addition to the recommended procedures, other methods are described for the sake of completeness and to compare
different methods of design.
The Report was produced by a sub-committee of the Joint Structural Division of the South African Institution of Civil
Engineers, and the Institution of Structural Engineers.
PRESTRESSED CONCRETE FLAT SLABS
1.0 Introduction
In 1989 the Structural Division of the South African Institution of Civil Engineers created a sub-committee to examine
the design of prestressed concrete flat slabs. It was found that a certain amount of poor design was prevalent, and the
committee decided to produce a booklet of recommendations for good practice.
The matter was considered especially important because the South African Loading Code was changed with effect from
1990, and the required factor on D.L. is now 1.2, whereas it was previously 1.4. This has the effect of reducing
reinforcement areas, and cracking and deflection require more attention. To make allowance for this, SABS 0100 was
revised, and among other changes, the allowable concrete shear stress was reduced by 10 percent, to lessen the probability
of brittle shear failures.
1.1 Flat Slabs
Flat slabs were originally invented in the USA at the beginning of this century, and there were a number of patented
systems.
The early reinforced concrete flat slabs all had drops, and columns with capitals, and were considered to be the structure
of choice for warehouse construction and heavy loads. Because of the columns capitals and drops, shear was not really a
problem.
Design was based on tests on stresses in reinforcement at working loads, and the early codes required a total moment in
a span of WL2/11.
It was realized that statically a total moment of about WL2/8 was required for equilibrium, (If the column diameter is D,
the statically required moment is (very closely) W(L-2D/3)2/8 where L-2D/3 is the effective span. The difference between
WL2/11 and WL2/8 was attributed to a mystical '2 way action'. In fact it was due partly to tensile stresses in the concrete
and partly to arching effects reducing the measured stress in the reinforcement.
The philosophy, and the empirical coefficients, persisted until the 1950's when the allowable stresses in reinforcement
were increased, limit state design was introduced, and the statically required moment of WL2/8 was introduced into the
codes. This was because it was felt that it was not safe to rely on arching or tensile strength of the concrete. In addition
to the changed moment coefficients, the frame method of analysis was required in certain cases.
1.2 Flat Plates
Flat plates were subsequently developed, with no drops and no column capitals/
This document outlines the design of a frame to support a 45kN load 2m above an object. The frame design was developed in Dr Frame 3D software. Calculations were provided to analyze the design for buckling, bending, welding, and fastening. For buckling, the factor of safety was 11.08. For bending, the factor of safety was 1.95. Welding and fastening calculations determined minimum weld and bolt sizes of 10mm would be required. While initial values met requirements, improvements could be made to the design.
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1. Compressive Membrane Action in
Concrete Decks
9th fib International PhD Symposium in Civil Engineering
Karlsruhe Institute of Technology (KIT), Germany
Sana Amir
24-07-2012
Prof. Dr. ir. J. C. Walraven, Dr. ir. C. van der Veen
Structural Engineering / Concrete Structures van de presentatie
Titel 1
2. Contents
1: Introduction: Compressive Membrane Action
2: CMA in reinforced concrete decks
- Flexural load carrying capacity
- Punching Shear capacity
3: Application of CMA theories to experimental data
4. CMA in transversely prestressed concrete decks : Investigating
Punching Shear capacity
5. Future Tests
6. Conclusions
Titel van de presentatie 2
3. Introduction
Compressive Membrane Action
CMA is a phenomenon that occurs in slabs whose edges are
restrained against lateral movement by stiff boundary elements.
This restraint induces compressive membrane forces in the
plane of the slab (Park and Gamble, 1980).
Titel van de presentatie 3
4. Introduction
Compressive Membrane Action
• Bridges are traditionally designed to carry the wheel load entirely in
flexure.
ASSUMPTION: Adequate shear capacity.
• A bridge deck slab designed for bending tends to fail in the punching
shear mode at a load much higher than that based on flexure.
?
• Considerable research is done on reinforced decks. Prestressed decks
need to be investigated.
PhD Research
Titel van de presentatie 4
5. CMA in reinforced concrete decks
Flexural Capacity by Rankin and Long
Marc ArchingCap acity
Mb BendingCap acity
Pflx k (Marc Mb)
ka = 8/L and kb = 4/L
Titel van de presentatie 5
6. Punching Shear Capacity
Kirkpatrick, Rankin, Long, Taylor’s Approach
UK HIGHWAY AGENCY STANDARD BD 81/02
kf c/ h 2
Qe
320 0.75d 2
Pp 1.52( d )d f c (100Qe )0.25
/
Titel van de presentatie 6
7. Punching Shear Capacity
Mikael Hallgren Model • Modified form of Kinnunen – Nylander Model.
Limitation:
Analysis of symmetric punching of reinforced
slabs without shear reinforcement – Open to
further development.
Titel van de presentatie 7
12. Prestressed Concrete Decks
• Provisional of additional in-plane forces due to prestressing
• Improved punching shear capacity
• Improved serviceability
Titel van de presentatie 12
13. Analysis Methods
Engineering Method Modified Hallgren Model
ps f pe
e s
fy
Charts from OHBDC or NZ code may be
used to estimate the ultimate capacity.
where Fb = η Fb(max) and Mb = η Mb(max)
Method of superposition
Punching Load
Boundary Lateral Prestressing
Restraint
Titel van de presentatie 13
15. (TPL ~ Punching Load)
100
90 Pt
Punching Load (kN)
Pmh
80
PNZ
70
Linear (Pt)
60
50
40
0 1 2 3 4 5
TPL (MPa)
Savides (1989), He (1992)
Tests in Queen’s University, Kingston, Canada
• Prestressing postpones the commencement of lateral movements, delays cracking.
•Lesser the lateral movement possible, higher is the level of CMA leading to higher
punching loads.
Titel van de presentatie 15
16. FUTURE TESTS
• Variable TPL
• Joint skewness and roughness
• Variable position/locations of the load
Transverse Prestress Level
1.25 MPa 2.5 MPa
6400
Titel van de presentatie 16
19. Conclusions & Future Study
•The UK Highway Agency BD81/02 gives good results for rigidly restraint deck slabs.
However, when the restraint is low, the results are unsafe. Also, this method does not
allow for the effect of varying reinforcement ratio.
•Taylor’s approach incorporates both flexural punching and shear punching failures.
•The New Zealand code gives better estimation when the TPL is high.
•Modified Hallgren model gives good results both for reinforced and transversely
prestressed deck slabs, therefore it will be used for future tests as well.
• Deck slabs exhibit high punching strength in the presence of CMA resulting from lateral
restraint and transverse prestressing.
•Future Study: Working on a 3D Nonlinear FEM Analysis.
Titel van de presentatie 19