摘要
对7075铝合金板材淬火过程进行温度场和应力场的直接热力耦合数值模拟,获得淬火残余应力分布规律,在此基础上开展基于等向强化Mises屈服准则和Prandtl-Reuss塑性流动增量理论的铝合金拉伸过程数值模拟,仿真不同拉伸率对内部残余应力的消除效果,采用盲孔法对铝合金淬火及不同拉伸量拉伸后残余应力进行实验测量,结果表明对于厚12mm的7075铝合金试件最优拉伸率为1.0%。同时根据不同拉伸率拉伸后铝合金板材残余应力分布规律的变化趋势可以看出,以不同拉伸率拉伸后铝合金板材表面和内部残余应力的消除效果具有相同的变化趋势。
Numerical simulation of the direct thermo-mechanical coupling of temperature field and stress field during the 7075 aluminium alloy plate＇s quenching process is investigated and the distribution tendency of residual stress is acquired.Numerical simulation of the elimination effect of varying stretching rates on the residual stress in the stretching process is carried out based on isotropic hardening Mises yield criterion and Prandtl-Reuss plastic flow rule with incremental theory.Then blind hole method is adopted to measure the residual stress.Both results show the optimum stretching rate for 12 mm thick 7075 aluminum alloy plate is 1%.From the residual stress distribution rules,it is showed that with varying stretching rates,the elimination effects of surface and internal residual stresses have similar variation tendency.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2011年第9期33-38,共6页
Journal of Chongqing University
基金
科技特派计划项目(2009GJF10028)
关键词
淬火
预拉伸
拉伸率
优化
实验
quenching
pre-stretching
stretching rate
optimize
experiment
