Plastics are complex materials, which can also be seen when we view their mechanical behavior under strain. The stress / elongation ratio of this material demonstrates that it is very dependent upon the elongation, the elongation speed, the temperature, the moisture as well as the type of strain placed upon it.
You can only obtain realistic calculation results of the material properties of plastic components under strain if you select the right material models in addition to the mere networking of the geometry and the application of boundary conditions. The knowledge concerning the material model to be used, the material characteristic values that are necessary to this end and also the design criteria relating to the respective loading case under review is decisive to ensure the results are authoritative.