Influence of viscous medium temperature distribution on sheet fracture in viscous pressure forming at warm temperature  

作　　者：刘建光 王忠金 张鑫 李毅 

机构地区：[1]School of Materials Science and Engineering,Harbin Institute of Technology [2]Shenyang Aircraft Industry Group Co Ltd

出　　处：《中国有色金属学会会刊：英文版》2007年第A01期223-227,共5页Transactions of Nonferrous Metals Society of China

基　　金：Project(50275035) supported by the National Natural Science Foundation of China

摘　　要：Viscous pressure forming(VPF) of aluminum alloy AA3003 sheet metal at warm temperature was investigated by using coupled thermo-elastoplastic-viscoplastic finite element method. The influence of viscous medium temperature distribution on sheet fracture location was studied and the distributions of fracture factor at different temperatures were obtained by using ductile fracture criterion. The results show that the failure of sheet metal varies with increasing initial temperature of viscous medium. When the initial temperature of viscous medium is near that of sheet metal,the failure location occurs at dome center,and when the initial temperature of viscous medium is too low,however,the failure location occurs at die corner. The occurrence of fracture can be postponed and even prevented through controlling the temperature distribution in viscous medium.Viscous pressure forming （VPF） of aluminum alloy AA3003 sheet metal at warm temperature was investigated by using coupled thermo-elastoplastic-viscoplastic finite element method. The influence of viscous medium temperature distribution on sheet fracture location was studied and the distributions of fracture factor at different temperatures were obtained by using ductile fracture criterion. The results show that the failure of sheet metal varies with increasing initial temperature of viscous medium. When the initial temperature of viscous medium is near that of sheet metal, the failure location occurs at dome center, and when the initial temperature of viscous medium is too low, however, the failure location occurs at die comer. The occurrence of fracture can be postponed and even prevented through controlling the temperature distribution in viscous medium.

关 键 词：温度 分布情况 铝合金 测试方法 

分 类 号：TG115.5[金属学及工艺—物理冶金]