Non-Isochoric Plasticity Assessment for Accurate Crashworthiness CAE Analysis. Application to SAMP-1 and SAMP-Light

A deep understanding of advanced material plasticity and fracture is one of the cornerstones of mechanical engineering to overcome present and future challenges in the automotive industry with respect to lightweight multi-material body solutions. The von Mises plasticity model is well-known and efficiently implemented in the various CAE solvers conventionally used in the automotive industry. One of the principal characteristics of the von Mises model is the assumption of isochoric plasticity (i.e. no change of volume is caused by yielding). The literature and experiments show that some materials, like extruded aluminium or polymers, exhibit non-isochoric plastic behaviour. Since this effect cannot be captured by the von Mises plasticity model, an optimal design for lightweight structural solutions is compromised.