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Meshing and Stress Analysis of a “Droop” Limiter By: Geoffrey L. Ostermeyer Final Project For: ME 450 Professor: Dr. Craig Weeks December 14, 2000
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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.
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Background Designed by Senior Design Team Used on the Electric Race Car Limits Rear End Lift to 3/16”
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The Droop Limiter
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Parts – Defined Steel Washer Rubber Washer -- Damper Upper Bracket Tie-Rod Connector A-Frame Mounting Bolt
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Geometry Generation Import IGES files from Pro-E Create Volumes in Ansys Simplified Geometries
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Pro-E Imports
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Ansys Volumes
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Simplified Geometries From To
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Combining Parts Volume Adding Surface Coupling Contact Surfaces
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Adding Volumes
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Coupling Surfaces
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Contact Surfaces
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Assembled Geometries
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Meshing Mapped versus Free
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Completed Mesh
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Stress Analysis – Tie-Rod Connector
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Stress Analysis – Upper Bracket
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Stress Analysis – Washer/Tie-Rod Weld
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Damper Design
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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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