Abstract：he advanced high strength steel (AHSS) realizes the outstanding advantage of strength by transforming its internal different phases. It has become one of the hottest materials for current automotive lightweight researches. However, compared with traditional deep-drawing steels, the widespread use of AHSS in auto-industry is hampered due to its poor ductility, which leads to frequent occurrences of failure in the mode of fracture during the process of stamping. Therefore, the fracture prediction of AHSS becomes one of the focuses of current researchers. The dual phase (DP) steel can be seen as the representative of AHSS. In this paper, the fracture criteria of DP steel under different stress states are investigated by combining experimental and numerical analysis and an appropriate failure criterion is attempted to be established for predicting its fracture behavior.
2012, Vol. 33 
