空穴长大延性损伤新模型  

A NEW DUCTILE DAMAGE MODEL BASED ON VOID GROWTH

作　　者：赵震[1] 谢晓龙[1] 李明辉[1] 

机构地区：[1]上海交通大学塑性成形工程系,上海200030

出　　处：《金属学报》2007年第10期1037-1042,共6页Acta Metallurgica Sinica

基　　金：国家自然科学基金50505027

摘　　要：以45中碳钢为研究对象,进行了拉伸、压缩、扭转、精冲实验,并结合有限元对各实验过程中的应力三轴度和延性损伤进行了分析,归纳了金属材料的3种延性损伤机理:无空穴影响剪切损伤、剪切型空穴损伤和拉伸型空穴损伤.在上述工作基础上,提出了一个新的基于空穴长大的延性损伤模型,能够较准确地预测材料拉伸、精冲过程中延性断裂的出现,扩大了损伤模型的预测范围.Tensile, compression, torsion, and fine blanking tests of 45 steel were performed, and the stress triaxiality and ductile damage of each test are analyzed with FEM. Furthermore, three ductile damage mechanisms were proposed, which are shear damage without the influence of voids, shear-form void damage and tensile-form void damage. Based on above analysis, a new ductile damage model based on void growth was proposed, which can predict the occurrences of ductile fracture during tension and fine-blanking of metallic materials accurately.

关 键 词：中碳钢 空穴 应力三轴度 延性损伤 延性断裂 

分 类 号：TG386[金属学及工艺—金属压力加工]