Al-Mg-Si基合金车身板材成形极限及数值应用  

Forming Limit of Al-Mg-Si Based Alloy Automotive Outer Sheet and Its Numerical Application

作　　者：林敦文[1] 关绍康[1] 卢广玺[1] 陈晶阳[1] 

机构地区：[1]郑州大学材料科学与工程学院,河南郑州450002

出　　处：《机械工程材料》2006年第4期64-67,共4页Materials For Mechanical Engineering

基　　金：河南省杰出人才创新基金(0321001100);河南省科技攻关资助项目(0224360015)

摘　　要：采用成形极限图(FLD)试验,运用网格应变自动测试分析系统ASAME,对Al-Mg-Si基合金车身板的成形极限进行了检测,同时,将FLD应用于有限元分析作为成形时出现破裂缺陷的判据,并分析车门外板在冲压成形过程中破裂危险部位主应变在FLD上分布。结果表明：Al- Mg-Si基合金板材的成形极限高于目前常用的AA6111铝合金车身板；拉延筋的形状和位置对成形过程的影响很大,采用双曲面法设计车门可以改善车门腹部拉深不充分引起的刚度问题。The forming limit of Al-Mg-Si based alloy sheet was tested and the forming limit diagram （FLD） was determined by using FLD test and automated strain analysis and measurement system （ASAME）. The result of comparison analysis showed that the forming limit of Al-Mg-Si based alloy sheet was higher than that of AA6111 sheet at the same thickness and heat treatment state （T4）. The above result was also applied to the commercial finite element analysis to serve for the fracture criterion during forming. Automotive door panel was investigated in order to test the application formability of Al-Mg-Si based alloy sheet. Through analysing the distribution of principal strain in FLD, it was found that the shape and position of brake bead played vital role in forming processing and the rigidity problem could be solved by using the double surface designing method.

关 键 词：Al-Mg-Si基合全 成形极限 有限元模拟 车门外板 

分 类 号：TG386.41[金属学及工艺—金属压力加工] U463.223[机械工程—车辆工程]