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.
出处
《有色金属》
CSCD
北大核心
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 )
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
material science foundation
equal channel angular pressing
upper bound solution
severe plastic deformation
