摘要
粉末冶金材料是塑性可压缩材料 ,其塑性理论方法有待于深入研究。基于粉末冶金材料的屈服条件和塑性势理论 ,导出了该类材料的塑性本构关系、平面应变屈服条件和屈服轨迹方程 ,揭示了其平面塑性变形的屈服面、滑移和速度间断等基本规律。基于此建立了粉末冶金材料平面应变广义上限法 ,并以平面应变挤压为例说明了该方法的应用。
Powder metallurgical material is compressible in plastic deformation. Its plasticity method needs to be further researched. Based on the yield criterion and plastic potential theories, a plastic constitutional relation, yield condition and yield curve equation in plane strain for powder metallurgical material were derived. Some plastic behaviors such as yield plane, slip and velocity discontinuity in plane strain were also revealed. Furthermore, a generalized upper bound method for powder metallurgical material in plane strain was developed and its application was illustrated by analyzing the plane strain extrusion.
出处
《武汉理工大学学报》
CAS
CSCD
2004年第12期12-15,共4页
Journal of Wuhan University of Technology
基金
国家自然科学基金 (5 0 175 0 86
5 0 175 0 85 )
塑性成形模拟及模具技术国家重点实验室开放基金 (0 2 - 3)
关键词
粉末冶金材料
塑性理论
平面应变
广义上限法
挤压
powder metallurgical material
plasticity theory
plane strain
generalized upper bound method
extrusion
