IET 450: FEA Written Exam questions
well answered graded A+
How is the Stress-Strain Curve related to FEA? - ANS ✔Analyzes the elastic region of the stress-
strain curve
Linear Vs. Non-Linear FEA Analysis - ANS ✔Linear: where stresses remain in the linear elastic
range of the used material (not deformed)
Non-Linear: large deformations, elasto-plastic material (past its elastic capabilities)
Interpretation of FEA Simulation - ANS ✔Safety Factor: if the maximum stress is higher than the
yield strength... Von Misses Stress, Displacement- if the effects of a restraints and loads are
insignificant or not
Structural properties of a material in Catia - ANS ✔Young's Modulus, Poisson's Ratio, Density,
Thermal Expansion, Yield Strength
Difference between linear and parabolic meshses - ANS ✔Linear-4 nodes (better for square
objects)
Parabolic-10 nodes (better for circular objects)
Short comings of FEA in Catia - ANS ✔Material Linearity, Small Strains, Limited Contact
Capabilities, Limited Dynamics, Beam and Shell Formulation
What is needed to do mesh refinement/optimization? - ANS ✔Starting mesh, give mesh size and
sag- If manual
, What is the procedure to do mesh refinement/optimization? - ANS ✔Keep running smaller and
smaller mesh sizes until the maximum stress changes insignificantly
Manual mesh refinement - ANS ✔Input mesh size, sag size, parabolic/linear- can add local mesh
for additional layers
Automated Mesh refinement - ANS ✔New Adaptivity Entity--> select mesh (objective error)--
>Compute with Adaptivity (iteration,min size)
Mesh Shapes for 3D objects in FEA - ANS ✔Linear Tetrahedron Meshing, Parabolic Tetrahedron
Meshing
Mesh Shapes for 2D objects in FEA - ANS ✔Linear Triangle Meshing, Parabolic Triangle Meshing,
Mesh Shapes for 1D objects in FEA - ANS ✔Linear Beam Meshing, Parabolic Beam Meshing
Advanced Meshes in Advanced Mesh Toolbar - ANS ✔Linear/Parabolic Triangle and Quadrangle
Meshes
Two ways to apply symmetry in FEA - ANS ✔Surface Slider or User-defined restraint in directions
you don't want it to move
Ways to apply material properties in Catia - ANS ✔Part Design Workbench: Apply Material
Generative Structural Analysis: User Material
Shrink Fit and Overlap amount in pressure fitting connection property - ANS ✔Use half of the
diametrical interference, If the overlap is .002 in, the the input amount is .001 in
well answered graded A+
How is the Stress-Strain Curve related to FEA? - ANS ✔Analyzes the elastic region of the stress-
strain curve
Linear Vs. Non-Linear FEA Analysis - ANS ✔Linear: where stresses remain in the linear elastic
range of the used material (not deformed)
Non-Linear: large deformations, elasto-plastic material (past its elastic capabilities)
Interpretation of FEA Simulation - ANS ✔Safety Factor: if the maximum stress is higher than the
yield strength... Von Misses Stress, Displacement- if the effects of a restraints and loads are
insignificant or not
Structural properties of a material in Catia - ANS ✔Young's Modulus, Poisson's Ratio, Density,
Thermal Expansion, Yield Strength
Difference between linear and parabolic meshses - ANS ✔Linear-4 nodes (better for square
objects)
Parabolic-10 nodes (better for circular objects)
Short comings of FEA in Catia - ANS ✔Material Linearity, Small Strains, Limited Contact
Capabilities, Limited Dynamics, Beam and Shell Formulation
What is needed to do mesh refinement/optimization? - ANS ✔Starting mesh, give mesh size and
sag- If manual
, What is the procedure to do mesh refinement/optimization? - ANS ✔Keep running smaller and
smaller mesh sizes until the maximum stress changes insignificantly
Manual mesh refinement - ANS ✔Input mesh size, sag size, parabolic/linear- can add local mesh
for additional layers
Automated Mesh refinement - ANS ✔New Adaptivity Entity--> select mesh (objective error)--
>Compute with Adaptivity (iteration,min size)
Mesh Shapes for 3D objects in FEA - ANS ✔Linear Tetrahedron Meshing, Parabolic Tetrahedron
Meshing
Mesh Shapes for 2D objects in FEA - ANS ✔Linear Triangle Meshing, Parabolic Triangle Meshing,
Mesh Shapes for 1D objects in FEA - ANS ✔Linear Beam Meshing, Parabolic Beam Meshing
Advanced Meshes in Advanced Mesh Toolbar - ANS ✔Linear/Parabolic Triangle and Quadrangle
Meshes
Two ways to apply symmetry in FEA - ANS ✔Surface Slider or User-defined restraint in directions
you don't want it to move
Ways to apply material properties in Catia - ANS ✔Part Design Workbench: Apply Material
Generative Structural Analysis: User Material
Shrink Fit and Overlap amount in pressure fitting connection property - ANS ✔Use half of the
diametrical interference, If the overlap is .002 in, the the input amount is .001 in
