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

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。作为工作在不寻常的压力下的物质行为的扩展，在可塑性-蠕变互动条件和寿命估计下的非弹性变形，在肥胖-蠕变状态下都被审查在组合的压力状态（压缩）和张力下。由规格规格化和温度为600 ° C的2Cr-1 Mo钢，五类问题的十种（它们是简单的和循环的张力或张力，由组合的塑料和副动词引起的张力爬行，对cruciform或循环路径下的反应，组合压力下的机械拉链，以及阶段内和阶段外循环约束）被确定为项目的第一部分，而且相位内和相位外脂肪爬行测试都是在第二部分进行的。10种固定模型预测的非弹性反应，用14种方法测量，用相应的实验结果来评估准确性，以模拟材料的实际行为，以及由7种方法估计的生命也用比较物绘制。在这里，这个意象集中在生命估计程序上，通过构造模型运用计算出的压力-应变反应三种方法。

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.