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Damage tolerance approach for probabilistic pitting corrosion fatigue life prediction

机译：概率腐蚀点疲劳寿命预测的损伤容限方法

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摘要

The fatigue damage process induced by pitting corrosion is composed of seven stages: pitting nucleation, pit growth, transition from pit growth to short crack, short crack growth, transition from short crack to long crack, long crack growth, and fracture. A comprehensive mechanics-based probabilistic model for pitting corrosion fatigue life prediction by including all the seven stages is presented in this paper. An analytical first-order reliability method (FORM) and Monte Carlo simulation are implemented with the proposed model. Probabilistic sensitivity analysis is performed using the analytical FORM approach as well as through parametric studies. A numerical example is implemented for the application of the proposed method for the corrosion fatigue life prediction of aluminum alloys. The cumulative distribution function of the fatigue life is obtained and the effect of several important random variables and their scatter on the fatigue life estimation is investigated.
机译：点蚀的疲劳破坏过程包括七个阶段：点蚀成核，点蚀生长，从点蚀向短裂纹的过渡，短裂纹的扩展，从短裂纹向长裂纹的过渡，长裂纹的扩展和断裂。本文提出了一个综合的基于力学的概率模型，该模型通过包括所有七个阶段来预测点蚀疲劳寿命。该模型实现了解析一阶可靠性方法（FORM）和蒙特卡洛仿真。概率敏感性分析是使用FORM分析方法以及参数研究进行的。数值算例为所提出的方法在铝合金腐蚀疲劳寿命预测中的应用提供了依据。获得了疲劳寿命的累积分布函数，并研究了几个重要的随机变量及其散布对疲劳寿命估计的影响。

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