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3D Finite-Element Analysis of a Bike Crank

Learning Goals

In this tutorial, you will learn to:

  • Determine the displacements and stresses in a bike crank using 3D FEA capabilities in ANSYS Mechanical
  • Verify the finite-element results from ANSYS by refining the mesh and also comparing with hand calculations

Problem Specification

Consider the following bike crank model.

[!crank_geo.png|width=400!|^crank_geo.png]

To orient ourselves, the following figure shows the location of a similar bike crank mounted on a bicycle.

[!crank_on_bike.png|width=400!|^crank_on_bike.png]

Material properties: The bicycle crank's material is aluminum 6061-t6. The Young's modulus is 10,000 ksi, and the Poisson's Ratio is .33.

Boundary conditions: Apply a load of 100 lbf in the y-direction on the right hole surface and fix the 3 left hole surfaces as shown below. Note that this is an approximation of the actual loads and constraints on the bike crank.

[!crank_bcs.png|width=400!|^crank_bcs.png]

Using ANSYS Mechanical, determine the following:

  • Deformed shape
  • Displacement field
  • Stress distribution
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    $\sigma_x(x,y,z)$



[*Go to Step 1: Pre-Analysis & Start-Up*]

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