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Finite Element Codes are useful tools for predicting the structural performance of plastic components. Through the use of these tools conceptual designs can be assessed and mature designs can be optimized; thereby, shortening the costly build and test cycle. In the past predictions were most useful in predicting the load-displacement response of the component. This could be accurately done by accurately modeling the geometry and boundary conditions and by knowing the modulus of the material. As plastics have increasingly been used in more demanding applications such as load bearing automotive components, other nonlinear deformation processes and failure mechanisms become important. In plastics the yield stress is typically very strain rate sensitive and can also be pressure dependent as well.