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A Case Study

A Case Study. Jake Blanchard Spring 2008. How do we really use FEM?. The use of FEA is really more complicated than we have made it. The complication lies in converting a real structure into a numerical model. What are loads? What are boundary conditions? What features can we ignore? Etc.

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A Case Study

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  1. A Case Study Jake Blanchard Spring 2008

  2. How do we really use FEM? • The use of FEA is really more complicated than we have made it. • The complication lies in converting a real structure into a numerical model. • What are loads? • What are boundary conditions? • What features can we ignore? • Etc. • We also must ensure that our models are correct. • Testing will almost always be used before final production.

  3. Our Case – A bicycle crank

  4. Our Model

  5. What loads should we use?

  6. What properties should we use? • Aluminum alloy (2024-T4 Aluminum)

  7. What are the boundary conditions?

  8. What stresses do we expect?

  9. Background: Torsion • Polar Moment of Inertia • Stress

  10. What are the stress limits?

  11. No do the analysis and assess

  12. What design changes might be made?

  13. Viewing Contours on Cross Section • In 3-D models, it can be useful to view contours on a slice of the part • Try this: Plot Ctrls/Style/Hidden Line Options…

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