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中文摘要：
在优选模型参数和简化孔洞形核规律的基础上，采用Gurson—Tvergaard（GT）多孔材料本构模型分析圆筒件拉深过程；根据金属成形工艺特点，综合考虑拉伸型和剪切型2种不同韧性断裂机制，提出一个统一的韧性断裂准则形式。对于未经过预变形和经过预变形的圆筒件拉深试验和数值模拟进行了比较，结果表明：相对于成形极限图，新的韧性断裂准则可以更加准确地预测非线性路径下圆筒件的拉深破裂。
英文摘要：
Gurson-Tvergaard （GT） porous material model with optimized parameters and a practical void nucleation law is adopted to analyze deep drawing of cylindric parts. A unified fracture criterion, considering both tension-type mode and sheartype mode, is proposed and applied in the analysis. The comparison of experimental and numerical results of deep drawing using non-prestrained and prestrained blank confirms that our ductile fracture criterion （DFC） more accurately predicts the ductile fracture in the deep drawing process with nonlinear strain path compared with forming limit diagram （FLD）.
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