Deformation Study

     
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SAE J175 Standard, Wheel Deformation:
Perform SAE (Society of Automotive Engineers) J175 specification impact simulations on various alloy wheel designs for a major custom wheel manufacturer.

Special features:
3D model setup with kinematic-hardening, material model for Aluminum alloys, contact surfaces with impact, rubber tire material complete with steel belts and pressurized to 35 psi, mounting and test fixturing, and symmetry planes, 3D bricks, 2D plates, 3D trusses, and 3D beams.

Output:
Shear stresses (Von Mises, all shear, no tensile components) and permanent deformation (strain and displacement).

Comments:
The first two figures are from the SAE J175 test specification. The third figure is a CAD solid model of one of the wheels that was simplified for meshing. The simulation FEM (finite element model) was simplified but functional per the specification. Notice the rubber compound bumpers on the wheel mounting fixture linkage. Now compare to the FEM (click on the fourth thumbnail above). The first animation shows a test case of the fixturing as the test-mass strikes a wheel without a tire. The second animation shows the test with a tire inflated to 35 psi. Notice the change in the wheel maximum shear (Von Mises) stress with the tire mounted. Makes sense? Notice residual Von Mises stress after first strike; this is indicative of permanent deformation.