中文摘要：

采用Hill二次正交异性屈服函数，考虑损伤是各向同性的，建立起正交异性的弹塑性损伤模型．对某类型IF钢板进行了单拉、胀形和平面应变的3种成形实验，并结合密度测定方法，得到3种成形方式下的一系列密度损伤值．最后，将理论计算预测的损伤随累积塑性应变变化曲线和实验数据进行了比较和分析，并讨论了应变增量比、材料厚向异性指数对应力状态函数的影响。

英文摘要：

Hill＇s quadratic yield criterion and flow theory are employed to describe anisotropic plasticity of sheet metal during forming procedure. Based on Continuum Dam age Mechanics, an isotropic damage model is developed to give a damage-coupled localized necking criterion. Experiments of formality of sheet metal in three plane states have been performed on a kind of IF steel. By measuring the density, the damage curves obtained are compared with calculation results based on the damage-coupled model, which shows a good coincidence. Furthermore, the influence of the ratio of in-plane strain increments and anisotropic plastic parameter on stress triaxial function have been discussed.