Stretch rate and deformation for pre-stretching aluminum alloy sheet  

作　　者：朱才朝 罗家元 

机构地区：[1]State Key Laboratory of Mechanical Transmission,Chongqing University [2]China Automotive Engineering Research Institute Co.,Ltd.

出　　处：《Journal of Central South University》2012年第4期875-881,共7页中南大学学报（英文版）

基　　金：Project(2009GJF10028) supported by Technical Special Pilot Program of China;Project(CDJXS11110013) supported by the Fundamental Research Funds for the Central Universities of China

摘　　要：Numerical simulation combined with experimental test was carried out to analyze the pre-stretching process of the 7075 aluminum alloy sheet,from which the stress variation curves and residual stress of aluminum alloy sheet in different stretch rates were obtained.The results show that the residual stress in length direction is released after unloading the stretch force,while the residual stress in width direction is released during the stretching process.The study of residual stress elimination is beneficial for optimizing stretch rate on the basis of residual stress distribution law.By comparing the variation principle of residual stress in length direction,the size range of three deformation areas and elimination percentage of residual stress were obtained.The residual stresses of clamping area and transition area are not eliminated effectively,so sawing quantity should be the sum of both the areas.The elimination rate of residual stress in even deformation area could reach 90% after choosing a proper stretch rate,which is verified by both simulation and experiment.Numerical simulation combined with experimental test was carried out to analyze the pre-stretching process of the 7075 aluminum alloy sheet, from which the stress variation curves and residual stress of aluminum alloy sheet in different stretch rates were obtained. The results show that the residual stress in length direction is released after unloading the stretch force, while the residual stress in width direction is released during the stretching process. The study of residual stress elimination is beneficial for optimizing stretch rate on the basis of residual stress distribution law. By comparing the variation principle of residual stress in length direction, the size range of three deformation areas and elimination percentage of residual stress were obtained. The residual stresses of clamping area and transition area are not eliminated effectively, so sawing quantity should be the sum of both the areas, The elimination rate of residual stress in even deformation area could reach 90% after choosing a proper stretch rate, which is verified by both simulation and experiment.

关 键 词：residual stress stretch rate defonnation area sawing quantity 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TQ341.1[金属学及工艺—金属材料]