复杂应力状态下金属材料屈服模型及有限元验证  

A Theoretical and Numerical Research on Metal Criterion under Complex Stress States

作　　者：刘彦杰 李明强 杨卫平 LIU Yanjie;LI Mingqiang;YANG Weiping(Department of Strength Design,AVIC The First Aircraft Institute,Xi’an 710089,China)

机构地区：[1]航空工业第一飞机设计研究院强度设计研究所,西安710089

出　　处：《航空工程进展》2021年第4期131-137,共7页Advances in Aeronautical Science and Engineering

摘　　要：日益复杂的结构细节特征和载荷作用给飞机金属实体结构的精细化设计提出了极高挑战,对复杂应力状态下金属材料的屈服及失效行为的高精度预测是结构精细化设计与验证的关键。多种典型构形拉伸试验研究发现基于单一曲线假设的von Mises屈服理论难以精确描述金属材料在复杂三维应力状态下的屈服行为。为提高复杂应力状态下金属弹塑性行为的预测精度,提出一种基于应力三轴度和Lode角参数修正的von Mises屈服模型,将该修正模型以VUMAT用户材料子程序嵌入ABAQUS/explicit求解器对铝合金2024-T4试件的屈服行为进行数值模拟。结果表明:本文提出的修正屈服模型比von Mises屈服模型更符合试验结果。It is the fact that the complicity of structural details and loading conditions makes a great challenge of metal structure design.One of the most important aspects is to numerically predict the metal yield and failure behavior under complex stress state in a high accuracy.However,experimental results have revealed that the traditional von Mises criterion can not accurately predict yield behavior of metal under complex stress states.In order to improve the accuracy,a yield criterion modified by stress state parameters of triaxiality and Lode angle is proposed in this paper.Then modified yield criterion is implemented into ABAQUS/explicit with VUMAT user’s subroutine and applied to numerical analysis of 2024-T4 coupons.Numerical and experimental results show that the proposed yield criterion can improve the prediction accuracy of metal yield under complex stress state than traditional von Mises criterion.

关 键 词：应力三轴度 Lode角 复杂应力状态 金属屈服 屈服准则 

分 类 号：V252[一般工业技术—材料科学与工程] V216.1[航空宇航科学与技术—航空宇航制造工程]