Sample size effect on the dynamic torsional behaviour of the 2A12 aluminium alloy

作     者：J.H.Chen W.F.Xu R.Z.Xie F.J.Zhang W.J.Hu X.C.Huang G.Chen 

作者机构：Institute of Systems EngineeringChina Academy of Engineering PhysicsMianyangSichuan 621999China 

出 版 物：《Theoretical & Applied Mechanics Letters》 (力学快报（英文版）)

年 卷 期：2017年第7卷第6期

页      面：317-324页

核心收录：

学科分类：08[工学] 080203[工学-机械设计及理论] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：Financial support is from the NSFC(Grant Nos.11602257,11472257,11272300,11572299) funded by the key subject"Computational Solid Mechanics"of the China Academy of Engineering Physics 

主　　题：Torsional split Hopkinson bar Dynamic torsion Sample size effect Finite element analysis Stress distribution 

摘      要：In order to investigate the effect of sample size on the dynamic torsional behaviour of the 2A12 aluminium alloy. In this paper, torsional split Hopkinson bar tests are conducted on this alloy with different sample dimensions. It is found that with the decreasing gauge length and thickness, the tested yield strength increases. However, the sample innerlouter diameter has little effect on the dynamic torsional behaviour. Based on the finite element method, the stress states in the alloy with different sample sizes are analysed. Due to the effect of stress concentration zone （SCZ）, the shorter sample has a higher yield stress. Furthermore, the stress distributes more uniformly in the thinner sample, which leads to the higher tested yield stress. According to the experimental and simulation analysis, some suggestions on choosing the sample size are given as well.