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

Abstract

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-1