Life Prediction Techniques for Variable Amplitude Multiaxial Fatigue—Part 1: Theories
Life Prediction Techniques for Variable Amplitude Multiaxial Fatigue—Part 1: Theories
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DOI：
10.1115/1.2806821
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发表时间：
1996-07
影响因子：
1.2
通讯作者：
Chun H. Wang;Malcolm Brown
中科院分区：
文献类型：
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作者：
Chun H. Wang;Malcolm Brown
多轴随机载荷下的疲劳寿命预测是一个极其复杂和棘手的课题；文献中只提出了几种方法。此外，多轴随机载荷下的实验结果也很少。在这篇由两部分组成的论文的第一部分中，提出了一种多轴非比例循环计数方法和疲劳损伤计算程序，并与一种已发表的损伤搜索方法进行了比较。两种理论都基于临界平面概念，一种是单轴变幅载荷局部应变方法的扩展，另一种采用新的多轴随机载荷计数算法。原则上，这两种方法可以被视为多轴随机载荷下疲劳损伤累积的边界解。
Fatigue life prediction under multiaxis random loading is an extremely complex and intractable topic ; only a few methods have been proposed in the literature. In addition, experimental results under multiaxis random loading are also scarce. In part one of this two-part paper, a multiaxial non-proportional cycle counting method and fatigue damage calculation procedure are proposed, which is compared with one published damage-searching method. Both theories are based on critical plane concepts, one being an extension of the local strain approach for uniaxial variable amplitude loading and the other employing a new counting algorithm for multiaxis random loading. In principle, these two methods can be considered as bounding solutions for fatigue damage accumulation under multiaxis random loading.