Dynamic behaviour of high‐strength sheet steel in dynamic tension: Experimental and numerical analyses:

This paper presents the behaviour of high‐strength steel TRIP 700, frequently applied in automotive industries. This material is used to design some car components owing to high stress levels induced by phase transformation. Generally, a pre‐plastic deformation is induced in the sheet steel at a low strain rate to transform austenite into martensite. The next step is to design for example a crash box, as described previously by Durrenberger et al. [1], in order to increase the level of energy absorption. The problem with testing this material is the specimen attachment during the tension test, notably at intermediate and high strain rates. A special problem appears when this material is used for crash applications, namely the plastic behaviour at intermediate strain rates 50 s−1eee3×102 s−1 and for the maximum stress level observed at emax≈103 s−1 must be defined correctly. In order to evaluate the behaviour of materials for this range of strain rates, servohydraulic machines are used. However, even if th...