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Meshing and Stress Analysis of a “Droop” Limiter

Meshing and Stress Analysis of a “Droop” Limiter. By: Geoffrey L. Ostermeyer Final Project For: ME 450 Professor: Dr. Craig Weeks December 14, 2000. Problem Statement. Model, mesh, and analyze “Droop” Limiter using Ansys for IUPUI Electric Race Car Team.

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Meshing and Stress Analysis of a “Droop” Limiter

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  1. Meshing and Stress Analysisof a “Droop” Limiter By: Geoffrey L. Ostermeyer Final Project For: ME 450 Professor: Dr. Craig Weeks December 14, 2000

  2. Problem Statement Model, mesh, and analyze “Droop” Limiter using Ansys for IUPUI Electric Race Car Team. Analysis should include determination of stress concentrations and damper design.

  3. Background • Designed by Senior Design Team • Used on the Electric Race Car • Limits Rear End Lift to 3/16”

  4. The Droop Limiter

  5. Parts – Defined Upper Bracket Steel Washer Rubber Washer -- Damper Tie-Rod Mounting Bolt Tie-Rod Connector A-Frame

  6. Geometry Generation • Import IGES files from Pro-E • Create Volumes in Ansys • Simplified Geometries

  7. Pro-E Imports

  8. Ansys Volumes

  9. Simplified Geometries From To

  10. Combining Parts • Volume Adding • Surface Coupling • Contact Surfaces

  11. Adding Volumes

  12. Coupling Surfaces

  13. Contact Surfaces

  14. Assembled Geometries

  15. Meshing Mapped versus Free

  16. Completed Mesh

  17. Stress Analysis – Tie-Rod Connector

  18. Stress Analysis – Upper Bracket

  19. Stress Analysis – Washer/Tie-Rod Weld

  20. Damper Design

  21. Conclusions • Stress Concentration on Tie-Rod Connector is not expected to be a problem. • Upper bracket and washer/tie-rod weld stress concentrations are potential hazards. • At current dimensions, the damper would require a Young’s Modulus of approximately 30,000 psi (Polyester Elastomer). • A more conventional rubber may be used with a smaller washer thickness.

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