考虑应变非强化区的Ohno本构模型验证分析  

Verification of Ohno constitutive model with strain nonhardening region

作　　者：杨勇[1] 张克实[1] 李文翔[1] 胡桂娟[1] 蔚夺魁[2] 

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]沈阳航空发动机研究所,辽宁沈阳110015

出　　处：《广西大学学报（自然科学版）》2010年第1期175-180,186,共7页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(10662001;90815001);广西自然科学基金资助项目(桂科自0832024);广西大学科学基金资助项目

摘　　要：对含有塑性应变非强化区的Ohno循环塑性本构方程关于应力、内变量计算和一致切线刚度矩阵计算的过程进行了分析,在此基础上编写了ABAQUS材料用户子程序UMAT。然后用该程序对316L不锈钢材料的应变对称拉压变幅循环、应变非对称拉压变幅循环、应变对称剪切(扭转)变幅循环和轴向拉压棘轮循环等塑性变形过程进行了数值模拟,所得结果合理地反映了材料相应试验过程中的现象。In this paper, the algorithm procedure of Ohno constitutive equation with strain nonhardening region for computation of stress, internal variable and consistent tangent matrices is analyzed and discussed. A material user subroutine UMAT for ABAQUS software was composed according to the investigation mentioned above. By using this UMAT with ABAQUS software the symmetrical and unsymmetrical tension-compressed unequal amplitude strain cycle, symmetrical sheared unequal amplitude strain cycle and tension-compressed ratcheting were simulated. The results are found fairly reasonable in describing the phenomena observed in experiment.

关 键 词：循环加载 Ohno 本构模型 数值模拟 316L不锈钢 

分 类 号：O344.3[理学—固体力学] TU51[理学—力学]