随机加载下缺口局部应力应变的弹塑性有限元计算

根据材料在塑性变形后引起的各向异性和Bauschinger效应，利用Jhansale模型原理，对缺口件在随机加载下的缺口根部的局部应力和应变进行弹塑性有限元分析，有限元分析采用了随动强化模型，并考虑材料瞬态局部应力应变的响应特性，最后，将本文有限元的局部应力应变历程分析结果与工程上常用的Neuber法进行了比较。

CALCULATION OF ELASTIC-PLASTIC FEM FOR LOCAL STRESS STRAIN AT NOTCH UNDER RANDOM LOADING

To predict the stress strain response of a material subject to the random loading, an increment elastic plastic finite element model is required. Repeated loads can be thought to be the alternative loading of the tension and compression, and the random loading can be considered to be the repeated loads that their amplitude are not equal. According to the anisotropy caused by the plastic deformation for material and the Bauschinger effect, the local stress and strain were analyzed by elastic plastic FEM at notch under random loading in this paper. Kinematic hardening model was used in FEM analysis and the response behaviors of transient local stress strain for material was also considered. Finally, Neuber's calculating results were used to compare and evaluate the FEM analytical results given by this paper, and good correlation was observed.