Failure models for thermoplastics in LSDYNA

In recent years the demand on safety relevant plastic parts in the automotive industry has led to a strong interest for describing failure behavior of non- and fiber-reinforced thermoplastic materials. Currently material and failure modeling in crash simulations typically deal with simple von Mises visco-plasticity and mean strain failure criteria, which cannot describe the complex material behavior of plastics. Past developments have focused in the yield behavior under different load situations (tension, shear, compression). 4a engineering began generating material cards of dynamic bending tests to consider the typical tension-compression asymmetry of plastics. This led to better descriptions in the yielding, but further tests are required to determine the complex failure behavior. Developments in the last 10 years in simulation software tools provide the possibility to describe the failure and energy absorption by damage initiation and evolution models. The influence of triaxality and strain-rate on str...