2198铝锂合金充液拉深成形的本构模型及数值模拟  

Constitutive equation and numerical simulation of hydro-mechanical deep drawing of 2198 Al-Li alloy

作　　者：凌娟[1] 郭训忠[1] 李华冠[1] 骆心怡[1] 陶杰[1] 王辉[2] 

机构地区：[1]南京航空航天大学材料科学与技术学院,南京210016 [2]南京航空航天大学机电学院,南京210016

出　　处：《塑性工程学报》2015年第2期78-83,共6页Journal of Plasticity Engineering

基　　金：中国商飞公司国家工程研究中心创新基金资助项目(SAMC13-JS-15-032);南京航空航天大学研究生创新基地(实验室)开放基金资助项目(kfjj20130220);中央高校基本科研业务费专项资金资助项目

摘　　要：为建立能准确描述2198-T3态铝锂合金充液拉深成形的本构模型并合理制定成形工艺参数,采用单向拉伸实验测定2198-T3态铝锂合金0°、45°、90°方向的真实应力-应变曲线,并通过不同本构方程拟合材料变形抗力曲线。结果表明,具有初始屈服应力的幂函数本构方程对板材不同方向的试验数据拟合较好;2198-T3态铝锂合金板材塑性应变比r为0.931,具有良好的拉深性能;采用DYNAFOM有限元分析软件对充液拉深成形过程进行数值模拟,并对获得的成形性能参数进行验证。The true stress‐strain curves of 2198‐T3 aluminum‐lithium alloy in three different orientations （0° ,45° and 90°） were measured by uniaxial tensile test and fitted with different constitutive equations in order to establish an accurate constitutive model and obtain optimum forming parameters of the hydro‐mechanical deep drawing for the alloy .The results showed that the power law with initial yield stress was accurate for the different directions of the sheet .Meanwhile ,the plastic strain ratio r was 0.931 , indicating excellent drawing performance .Subsequently ,the hydro‐mechanical deep drawing simulation of this alloy was conduc‐ted by numerical simulation with DYNAFORM and the results were analyzed to verify the forming parameters .

关 键 词：2198铝锂合金 本构模型 充液拉深 数值模拟 

分 类 号：TG38[金属学及工艺—金属压力加工]