This example is a portion of a full belt with a steel cable embedded in rubber. The model was developed to determine if a 360 degree rotation could be applied. The left end of the model is restrained in all degrees of freedom. The right end of the model was "glued" to a rigid body and the rigid body rotated about its center. Obviously the region of the model near the boundary conditions needs to be ignored when the model is evaluated for stress/strain levels, therefore the model needs to include sufficient length to eliminate this region of the model from affecting the desired answer. The rubber material model was a neo-hookean Mooney-Rivlin. The steel cable was modeled as an isotropic material. While this model appears to be a very simple analysis, numerous attempts were made before the model could be twisted beyond 180 degrees. This is a good example to run to evaluate the robustness of your FEA package.

The image below shows the final twisted belt.