Evaluation of Inelastic Constitutive Equations under Plasticity-creep Interaction Condition subjected to Multiaxial Stresses

多轴应力塑性-蠕变相互作用条件下非弹性本构方程的评估

基本信息

批准号：
61302036
负责人：
INOUE Tatsuo
金额：
$ 8万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Co-operative Research (A)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1987
项目状态：
已结题

项目摘要

Some of the results of the bench mark project on the evaluation of constitutive equations and life prediction methods conducted by the project members are reported. As an extention of the work done for material behavior under uniaxial stress, inelastic deformation under plasticity-creep interaction condition and life estimation in fatigue-creep regime are both examined in combined stress state of tension (compression) and torsion. By specifying normalized and tempered 2 Cr-1Mo steel at 600゜C, ten kinds of problems of five categories (they are simple and cyclic tension or torsion, tensile creep followed by combined plasticity and vice versa, response under cruciform or circular path, mechanical ratcheting under combined stresses, and in-phase and out-of-phase cyclic straining) were established for the first part of the project, and in-phase and out-of-phase fatigue-creep tests were performed in the second part.Predictions of inelastic response by ten constitutive models by fourteen way sare compared with the corresponding experimental results to evaluate the accuracy in simulating the actual behavior of the material, and the estimated lives by seven methods are also plotted in comparison with the observed lives. Here, the emphasis is focused on the life estimation procedure by three methods employing caluclated stress-strain response by the constitutive models.

报告了项目成员进行的构成方程和生命预测方法的评估基准项目的一些结果。作为在单轴压力下为材料行为所做的工作的扩展，在疲劳 - 冻结状态的可塑性相互作用条件和寿命估计下进行的非弹性变形均以张力的组合状态（压缩）和扭转状态检查。通过在600°C下指定归一化和调节的2 cr-1mo钢，十种五类问题（它们是简单的，循环的张力或扭转，紧张的蠕变，紧张的蠕变，然后是可塑性，反之亦然，在十字形或圆形路径下的响应，在组合的压力和相结合的压力下，以及在相结合的压力下进行机械赛车，并在频率上进行了组合，并且在频率上进行了cy静止，并且在建立的情况下及其及其及时的静止和静止的静止和静止。与相应的实验结果相比，在第二部分中进行了隔离疲劳检验。十项构成模型通过十种本构模型对非弹性响应的预测，以评估材料的实际行为的准确性，并且还与经过的材料相比，还绘制了七种方法的估计寿命。在这里，重点是通过构成模型采用归类的应力应变响应的三种方法来关注生命估计程序。