中文摘要：

对板料成形中的成形极限应力图、最大变薄率、成形极限图以及韧性断裂准则等预测成形极限的方法，进行了综述和分析．指出利用韧性断裂准则，不但能够较好地预测塑性差的板料成形极限，而且还能考虑应变路径的变化．利用有限元方法模拟时，韧性断裂准则既可以应用到完全耦合的弹塑性损伤模型的增量方法中，也可以应用到一步有限元逆算法中．为了准确地预测成形极限，除了提高有限元模拟精度外，应找到一种本质地反映材料性能的韧性断裂准则．

英文摘要：

This paper overviewed the prediction methods of forming limit in sheet metal forming, which included forming limit stress diagram, the maximum forming thinning ratio, forming limit diagram and ductile fracture criteria（DFC）. Then this paper pointed out that DFC could predict the forming limit of metal sheet with low plasticity well and meantime take the change of forming path into account. When adopting FEA to model, DFC could not only apply into incremental approach with a fully coupled elastic and plastic damage model, but to one step inverse approach. To accurately predict forming limit, a criterion to reflect material performance in essence was indispensable besides increasing the FEA model accuracy.