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