( 1. 西北工業(yè)大學(xué) 工程力學(xué)系, 西安 710072；
2. 中航第2集團 608研究所， 株洲 412002)
摘 要: 采用Gurson本構(gòu)方程對含有夾雜的粉末冶金材料拉伸試件進(jìn)行有限變形塑性損傷分析。研究了不同位置和不同形狀的夾雜對基體空穴長大、 形核、 應(yīng)力分布、 裂紋萌生及材料的破壞特性的影響。 數(shù)值模擬結(jié)果表明： 夾雜位置和夾雜形狀對空穴體積增長分?jǐn)?shù)和空穴成核率有著顯著影響，夾雜形狀和位置對基體破壞作用明顯， 可以推論對粉末冶金材料件的使用壽命有明顯的影響。
關(guān)鍵字: Gurson本構(gòu)方程；數(shù)值模擬； 夾雜； 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
