( 1. 西北工业大学 工程力学系, 西安 710072；
2. 中航第2集团 608研究所， 株洲 412002)
摘 要: 采用Gurson本构方程对含有夹杂的粉末冶金材料拉伸试件进行有限变形塑性损伤分析。研究了不同位置和不同形状的夹杂对基体空穴长大、 形核、 应力分布、 裂纹萌生及材料的破坏特性的影响。 数值模拟结果表明： 夹杂位置和夹杂形状对空穴体积增长分数和空穴成核率有着显著影响，夹杂形状和位置对基体破坏作用明显， 可以推论对粉末冶金材料件的使用寿命有明显的影响。
关键字: Gurson本构方程；数值模拟； 夹杂； 形核
（ 1. Department of Engineering Mechanics, Northwestern Polytechnical University,
Xi′an 710072, China;
2. Institute 608, Aviation Group 2 of China, Zhuzhou 412002, China）
Abstract: Based on Gursion model, the damage analysis was carried out on the tensile specimens of powder metallurgy materials including isolated big void. Special attentions were put on the influence of the location and the shape of isolated big void. The void mechanism was studied. The results shows that the isolated void has much influence on the damage and fracture of the powder metallurgy materials.
Key words: Gurson model; numerical simulation; inclusion; nucleation
