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Probabilistic modeling of damage accumulation for fatigue reliability analysis

机译:损伤累积的概率模型用于疲劳可靠性分析

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摘要

Combining a nonlinear damage accumulation model, a probabilistic S-N curve and one-to-one probability density functions transformation technique, a general probabilistic methodology for modeling damage accumulation is developed to analyze the fatigue reliability in this paper. The damage accumulation is characterized as a distribution in a general degradation path, which captures a nonlinear damage accumulation phenomenon under multi-level loading conditions, its mean and variability change with time. Experimental data of 45 and LZ50 steels used in the railway vehicle are then used to validate the proposed methodology. The fatigue reliability is analyzed and demonstrated using probabilistic model of cumulative fatigue damage.
机译:结合非线性损伤累积模型,概率S-N曲线和一对一的概率密度函数转换技术,提出了一种通用的概率模型来模拟损伤累积,以分析疲劳可靠性。损伤累积的特征是在一般退化路径中的分布,它捕获了多级载荷条件下的非线性损伤累积现象,其均值和可变性随时间变化。然后,将用于铁路车辆的45和LZ50钢的实验数据用于验证所提出的方法。使用累积疲劳损伤的概率模型分析并证明了疲劳可靠性。

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