Influence of uniaxial tensile pre-strain on forming limit curve by using biaxial tensile test

作     者：Wennan YUAN Min WAN Xiangdong WU Bolin MA Xu LU Bing YANG Wennan YUAN;Min WAN;Xiangdong WU;Bolin MA;Xu LU;Bing YANG

作者机构：Department of Mechanical Engineering and AutomationBeijing University of Aeronautics and AstronauticsBeijing 100083China Research Institute of BaosteelShanghai 201900China 

出 版 物：《Chinese Journal of Aeronautics》 (中国航空学报（英文版）)

年 卷 期：2020年第33卷第8期

页      面：2268-2280页

核心收录：

学科分类：08[工学] 0802[工学-机械工程] 0825[工学-航空宇航科学与技术] 0801[工学-力学（可授工学、理学学位）] 

基　　金：supported by the National Natural Science Foundation of China(Grant No.51875027) the China Postdoctoral Science Foundation(No.2018M630058) assistances of the program for the financial support 

主　　题：Aluminum alloy sheet Biaxial tensile tests Formability M–K model Yld2000-2d 

摘      要：This paper focused on the effect of pre-strain on forming limit curves(FLC)of 5754-O aluminum alloy sheet through utilizing biaxial tensile *** on Swift model and Yld2000-2 d yield criterion,the dimensions of cruciform specimen was optimized through applying finite element method for increasing the strain at specimen *** that,with the recommended specimen size,the cruciform specimen was tested under various stroke ratios to experimentally characterize the limit strains under different pre-strain ***,the biaxial tensile tests were simulated by Abaqus to obtain the limit strains and validate the material *** can be observed in both experiments and simulations that the pre-strained uniaxial tension followed by plane tension or equi-biaxial tension can improve the formability of sheet ***,the strain path change affects the trend of first derivative of strain rate difference between neighboring points with respect to *** early increase occurred and then fell back to the stable value,the steady evolution continued until to a new increase reaching the critical *** M–K prediction approach was simulated to verify the influence of pre-strain on *** can be found that the early increase peaks of the major strain incremental ratio rose with the amplitude of ***,the phenomenon of pseudolocalization caused by the strain path change was explained through evolution of stress state inside the groove.