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首页> 外文期刊>Frattura e Integrita Strutturale >On the applicability of Miner’s rule for multiaxial fatigue life calculations under non-proportional load histories
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On the applicability of Miner’s rule for multiaxial fatigue life calculations under non-proportional load histories

机译：Miner规则在非比例载荷历史下多轴疲劳寿命计算的适用性

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Fatigue design routines and computer codes must use some damage accumulation rule to deal with variable amplitude loadings (VAL), usually Palmgren-Miner (or Miner’s) linear rule for lack of a clearly better option. Nevertheless, fatigue lives are intrinsically sensitive to the order of VAL events, which may e.g. induce residual stresses and thus change the critical point stress state, much affecting its subsequent residual life. On the other hand, in general, non-linear damage accumulation rules are not robust, resulting in better predictions than Miner’s rule only for some specific load orders, requiring a case-by-case analysis. Therefore, Miner’s linear damage rule still is the usual choice in practical fatigue calculations and assessments, giving reasonable predictions at least when properly combined with approaches that sequentially consider plasticity-induced effects, following the critical point stress/strain history in a cycle-by-cycle basis. In this work, Miner’s rule is evaluated for non-proportional tension-torsion loadings on annealed tubular 316L stainless steel specimens. Normal-shear strain histories following either cross, diamond, circular or square paths are applied, and their fatigue lives are measured. Then, more complex VAL paths consisting of combinations of these individual path shapes are applied in other specimens, whose associated fatigue lives are predicted based on Miner’s rule.
机译：疲劳设计程序和计算机代码必须使用一些损伤累积规则来处理可变振幅载荷（VAL），通常采用Palmgren-Miner（或Miner的）线性规则，因为缺少明显更好的选择。然而，疲劳寿命本质上对VAL事件的顺序敏感，例如引起残余应力，从而改变临界点应力状态，极大地影响了其随后的残余寿命。另一方面，一般而言，非线性损伤累积规则并不稳健，因此仅对于某些特定的载荷阶次，其结果比Miner的规则更好，因此需要逐案分析。因此，Miner的线性损伤规则仍然是实际疲劳计算和评估中的常用选择，至少在与循序渐进地按照临界点应力/应变历史顺序依次考虑可塑性引起的影响的方法正确结合后，才能给出合理的预测。周期基础。在这项工作中，对退火后的316L管形不锈钢试样上的非比例拉伸-扭转载荷评估了Miner规则。应用遵循交叉，菱形，圆形或正方形路径的正剪应变历史，并测量其疲劳寿命。然后，将由这些单独路径形状的组合组成的更复杂的VAL路径应用于其他样本，这些样本的相关疲劳寿命是根据Miner规则预测的。

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