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
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2 Group Project Report due by Week 12 (Friday @ 11:59pm ) Report template: Assessment 3: Team Project: Final Report
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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’
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4 Physical Structure à FE model
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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
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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
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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
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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
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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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