摘要
为了优化铝合金预拉伸板拉伸过程中的工艺参数,对7075铝合金板淬火过程进行直接热力耦合数值模拟,在获得淬火残余应力分布规律的基础上开展考虑夹钳制约作用时铝合金拉伸过程数值模拟,研究了不同拉伸率时其残余应力消除效果,得出在夹钳制约作用下铝合金板材拉伸后变形3个区域——夹持区、过渡区和均匀区.采用盲孔法对夹持作用下铝合金板拉伸进行的实验测量验证表明,数值模拟和实验测量结果吻合.研究表明:对于厚12 mm的7075铝合金试件最适宜的拉伸率为1%,过渡变形区沿长度方向的长度约为8 mm,为板材厚度尺寸的67%,锯切量为过渡变形区和夹持区之和.
To optimize the parameters during stretching process of pre-stretched aluminum alloy sheet,thermo-mechanical coupled simulation of 7075 aluminum alloy sheet in quenching process is carried out.Based on the distribution principle of residual stress,stretching process of aluminum alloy sheet with clamping is simulated to study the relieving results of residual stress in different stretch rates.The simulation results show that three deformation areas,clamping area,transition area and uniform area,appear on the samples.Blind hole method is adopted to verify the experimental results,which are in accordance with simulation results.The test results show that,for the 7075 aluminum alloy sheet with thickness of 12 mm,the optimum stretch rate is 1%;transition area along length direction is 8 mm which is 67% of the thickness of plate,while the sawing amount is the sum of transition area and clamping area.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2011年第6期16-21,共6页
Materials Science and Technology
基金
科技特派计划资助项目(2009GJF10028)
关键词
夹持拉伸
拉伸率
残余应力
试验
clamping
stretch rate
residual stress
experiment
