摘要
将含有二阶段空洞长大模型的本构关系引入大变形刚黏塑性有限元中，研究了空洞敏感材料向锥台形凹模内超塑约束胀形时空洞化损伤与变形局部化行为，详细阐述静水背压Ｐｈ、初始空洞长大速率β＿０以及模具几何形状（锥角θ，模腔高度Ｈｐ）对局部化以及空洞断裂行为的影响，给出实现完全贴模条件下Ｐｈ－θ，Ｐｈ－β＿０，Ｈｐ－θ以及Ｐｈ－Ｈｐ间临界关系。
In this paper, the cavity damage and deformation localization behaviors of the constrained bulging of the cavity-sensitive superplastic metal sheets into cone-desk shape dies are numerically studied by using a largestrain rigid visco-plastic finite element method. Based on the simulation of practical alloy sheets,the influences of the superimposed pressure Ph,the initial cavity growth rate β_0 and the geomletrical shapes of the dies(the cone angle θ and the die heightHp)on the localization and cavity fracture behaviors are researched in detail.In addition,the critical relationships anioiig Ph and θ,Ph and β_0,Hp and θ,Ph and Hp have been obtained on the condition of full die-attaching.
出处
《力学学报》
EI
CSCD
北大核心
1995年第2期226-231,共6页
Chinese Journal of Theoretical and Applied Mechanics
基金
国家自然科学基金
中国科学院力学研究所LNM开放实验室资助
关键词
超塑性材料
约束胀形
空洞
损伤
变形
superplastic metal sheet,constrained bulging,caVity fracture,deformation localizdtion,rigid visco-plastic FEM
