基于新弹塑性模型全程模拟金属疲劳失效

发布时间：2017-12-27 18:31

本文关键词：基于新弹塑性模型全程模拟金属疲劳失效　出处：《力学季刊》2016年02期 　论文类型：期刊论文

【摘要】：金属材料疲劳失效问题是工程中一类主要问题,选择合理的材料本构关系对于准确确定疲劳失效强度至关重要.本文提出一个简单形式的自由光滑新弹塑性模型,该模型在不涉及通常的屈服条件以及加卸载条件的意义上完全自由,避免了模量间断问题,且比经典模型更简单、更符合实际.结果表明,该模型可直接模拟金属材料在循环加载下直至疲劳破坏的全过程,不涉及任何损伤变量以及人为假设的失效判据,特别地,可直接模拟金属材料的高周、低周疲劳直至最终失效破坏行为.应用P92钢的相关实验数据,给出了循环加载下的数值模拟结果,结果表明,在各种加载-卸载循环情形下,随着应力幅值的增大,疲劳失效循环数减少,这与实际材料行为相一致.
[Abstract]:The problem of fatigue failure of metal materials is one of the major problems in engineering, choose reasonable material constitutive relation for the accurate determination of fatigue failure strength is very important. This paper presents a simple form of free smooth new elastoplastic model, the model does not involve the usual yield conditions and loading conditions of completely free, to avoid modulus of discontinuous problems, and more simple than classical model, more practical. The results show that the model can directly simulate the whole process of metal material damage until fatigue under cyclic loading, does not involve any damage variable and the failure criterion, the artificial assumptions in particular, high cycle and low cycle fatigue of metallic materials can be directly simulated until the final failure behavior. Experimental data of P92 steel, the numerical simulation results under cyclic loading are given. The results show that under various loading unloading cycle condition With the increase of the stress amplitude, the number of fatigue failure cycles decreases, which is in accordance with the actual behavior of the material.
【作者单位】：潍坊学院数学与信息科学学院;上海大学上海市应用数学和力学研究所省部共建高品质特殊钢冶金与制备国家重点实验室;
【基金】：国家教委211工程科研启动基金(A.15-B002-09-032) 国家自然科学基金(11372172) 潍坊市科学技术发展计划项目(2015GX018)
【分类号】：O346.2
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