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The emergence of thermoplastics in automotive structural parts is constantly increasing as designers recognize the benefits thermoplastics bring, such as light-weighting, cost effectiveness, the ability to integrate parts, the flexibility to design intricate shapes, and the materials’ high specific energy absorption capacity. In order to predict the behavior of plastics by simulation using finite elemental analysis (FEA) tools such as LS-DYNA®1, an extensive understanding of properties and implementation using FEA is very important. In order to obtain reliable results from simulation, the FEA solver should support material models which predict the behavior of plastics accurately. LS-DYNA® supports several material models which are used to predict behaviour of plastics, and one, the Semi-Analytical Model for Polymers (SAMP-1 with GISSMO failure), was developed exclusively for plastics.