Week 11_FEA_evaluation.pdf - MIET2461 Biomedical CAD — Lecture 11 Finite Element Analysis by Dr Toh Yen Pang [email protected] 9925 6128

# Week 11_FEA_evaluation.pdf - MIET2461 Biomedical CAD —...

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1 Lecture 11: Finite Element Analysis by: Dr. Toh Yen Pang [email protected] 9925 6128 B251.3.22 MIET2461 Biomedical CAD
2 Group Project Report due by Week 12 (Friday @ 11:59pm ) Report template: Assessment 3: Team Project: Final Report
3 What is the Finite Element Analysis (FEA)? uniform loading Fixed boundary Problem: Obtain the stresses/strains in the plate Node Element Finite element model Description: - FEA cuts a structure into several elements - Then reconnects elements at ‘nodes’
4 Physical Structure à FE model
5 K [ ] u { } = F { } Fundamental Concepts (1/2) Many engineering phenomena can be expressed by ‘governing equations’ and ‘boundary conditions’ u { } = K [ ] 1 F { } algebraic equation Unknown displacement value
6 K [ ] u { } = F { } u { } = K [ ] 1 F { } Fundamental Concepts (2/2) Solve the algebraic equations, obtaining unknown variable at nodes Using the displacement values from the earlier step, strains and stresses are calculated
7 Preprocessing Analysis Postprocessing Build a FE model Conduct numerical analysis See Result Typical FEA Procedure u { } = K [ ] 1 F { } Apply material Mesh Restraints & Loads
8 Preprocess: Analysis type Finite element analysis in solid mechanics Structural Static Modal Thermal Vibration Buckling Steady state Transient
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10 Preprocess: Material properties Assign the appropriate values of the material Young’s modulus Poisson's ratio Density
11 Mesh Generation Meshing involves approximating the actual physical structure into the FE model using several simple geometric shapes called elements.

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