等径角挤压的上限解分析  

An Upper-bound Solution of Equal Channel Angular Pressing

作　　者：魏伟[1] 陈光[1] 

机构地区：[1]南京理工大学金属纳米材料与技术联合实验室,南京210094

出　　处：《有色金属》2005年第1期23-26,共4页Nonferrous Metals

基　　金：国家自然科学基金重点项目 (5 0 43 10 3 0 );江苏省自然科学基金项目 (BK2 0 0 10 5 3 )

摘　　要：采用上限法分析模具外角=0和模具内角=90°时的挤压力。结果表明,当=90°时,单位挤压力q和等效应变εe随ψ的增大而减小,且单道次最小等效应变不小于0 90。随着模具外角ψ的增大,ECAP所需的最大挤压力减小,但当ψ大于3 0°以后,最大挤压力减小的趋势变得平缓。实测的最大挤压力与上限解数值吻合。The extrusion load of ECAP at die angle ψ=0 and inner angle=90° is analyzed by the upper bound solution method. The results show that the value of specific extrusion load q and the equivalent strain ε e are decreased with the increase of ψ at=90°, but the equivalent strain ε e is no less than 0.90. The applied ECAP load decreases with the increase of ψ, however, this trend becomes gently while ψ over 30°. The measured maximum load required for ECAP is well consonant with the upper bound solution. The influence of ψ on the shear strain and plastic deformation should been considered carefully during ECAP.

关 键 词：挤压力 模具 等径角挤压 上限解 ECAP 等效应变 上限法 解数 内角 响应 

分 类 号：TG376[金属学及工艺—金属压力加工] TG249.6