Failure model calibration of a DP1000 dual phase steel using solid and shell elements for crash simulation

With the trend towards lightweight construction, advanced high-strength steel (AHSS) is increasingly being used in automotive structural components. Since the ductility of high strength steels is relatively low, damage behaviour of these materials must be accurately modelled. In automotive structures AHSS components are usually discretized with shell elements. With the increase of computation capacity attempts with solid elements are made to capture the loading state more accurately, especially after necking. For this reason, it is convenient to develop a method which enables a systematic model calibration from the 3D to the 2D loading situation. The failure strain of metallic materials depends on stress state. In the past years several studies have shown that the stress triaxiality is not sufficient to describe failure and empirical models were extended to consider the effect of Lode parameter. Recently it was also shown that the amount of bending seems to influence failure, namely i.e. the failure strain increases with the amount of bending.