Effect of Relative Grain Size on the Flow Stress of Polycrystalline FCC Sheets  

作　　者：杨梅 

机构地区：[1]Advanced Vocational Technical College, Shanghai University of Engineering Science

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2012年第3期477-483,共7页武汉理工大学学报（材料科学英文版）

基　　金：Funded by Science Foundation for the Excellent Youth Scholars of Shanghai (No.gjd10028)

摘　　要：A dynamic explicit finite element code and rate-dependent elastic-viscoplastic polycrystalline model were used to simulate the simple tension test of annealing FCC polycrystal and 6111-T4 aluminum alloy sheet metal. The variability of flow stress was investigated, which was induced by various grain boundary constraints when the ratio of thickness-to-grain size was changed. The simulated results show that, when the relative grain size increases, the constraint of grain boundary will increase accordingly, which results in the increase of the flow stress of polycrystal. The results agree with experiments.A dynamic explicit finite element code and rate-dependent elastic-viscoplastic polycrystalline model were used to simulate the simple tension test of annealing FCC polycrystal and 6111-T4 aluminum alloy sheet metal. The variability of flow stress was investigated, which was induced by various grain boundary constraints when the ratio of thickness-to-grain size was changed. The simulated results show that, when the relative grain size increases, the constraint of grain boundary will increase accordingly, which results in the increase of the flow stress of polycrystal. The results agree with experiments.

关 键 词：MICRO-FORMING crystal plasticity POLYCRYSTAL grain size 

分 类 号：TB302[一般工业技术—材料科学与工程]