基于Storen-Rice理论的薄板成形极限  

Forming limit of sheet metal based on Storen-Rice theory

作　　者：陈加明[1] 郭伟刚[1] 李慧敏[1] 赵从容[1] 周水琴[1] 

机构地区：[1]杭州职业技术学院友嘉机电学院,杭州310018

出　　处：《塑性工程学报》2016年第5期52-56,共5页Journal of Plasticity Engineering

基　　金：浙江省自然科学基金资助项目(LQ13E05002);浙江省高职高专院校专业带头人专业领军项目(lj2013052);浙江省公益技术应用研究项目(2016C01SA100494)

摘　　要：在St?ren-Rice成形极限理论模型的基础上,建立了基于Logan-Hosford屈服函数的塑性本构方程,将其引入成形极限推导获得极限应变的解析表达式。以两种铝合金板为对象,采用建立的极限应变表达式计算其成形极限曲线,并与实验数据进行对比;研究了屈服函数中的应力指数a和各向异性系数r对计算结果的影响。结果表明,应力指数a对负应变比区理论值影响较小,正应变比区理论值随应力指数a值的增大而减小,当应力指数a=4时理论结果与实验吻合较好;当应力指数a=2时,正应变比区理论值随各向异性系数r值的增大而减小,当应力指数a>2时理论结果对各向异性系数r值的变化不敏感。Based on the Storen-Rice theory,the analytical limit strain formula was derived by introducing the Logan-Hosford yield function.The limit strain of AL6111-T4 and AL2028was calculated based on the established formula.The effects of index aof yield function and anisotropy parameter r on the calculation results were discussed.The index ahas a little effect on the left hand side（LHS）limit strain,while the right hand side（RHS）limit strain decreases with the index a increases.Good correlation between the calculation result and experimental data is achieved when the index aequals to 4.The RHS limit strain becomes smaller when r gets larger with index aequal to 2,while it has less relation with r when aequals to 4or 6.

关 键 词：薄板 成形极限 Storen-Rice理论 屈服函数 各向异性 

分 类 号：TG386[金属学及工艺—金属压力加工]