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Formulation of a Polynomial Stochastic Fatigue Crack Growth Model

机译:多项式随机疲劳裂纹生长模型的制剂

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The study is focused on the formulation of a proposed polynomial stochastic fatigue crack growth model. Assuming the fatigue crack growth rate equal to a deterministic polynomial function in terms of fatigue crack size multiplied by a stationary lognormal random factor accounting for the statistical scatter of the fatigue crack growth, the analytical solutions of fatigue crack growth function and median crack growth function in term of model parameters were derived. Two extreme cases, lognormal random variable and lognormal white noise, of the proposed model were also investigated, and the analytical solutions of the distribution function of the random crack size at any service time and distribution function of random time to reach a specified crack size were obtained.
机译:该研究专注于制定提出的多项式随机疲劳裂纹裂纹生长模型。假设疲劳裂纹生长速率等于疲劳裂纹尺寸方面的确定性多项式函数乘以固定的伐木量随机因子核算疲劳裂纹增长的统计散射,疲劳裂纹增长功能和中值裂纹生长功能的分析解派生了模型参数的术语。还研究了两个极端情况,Lognormal随机变量和Lognormal白噪声,所提出的模型也研究,并且随机裂纹大小的分布解决方案在任何服务时间和随机时间的分布函数达到指定的裂缝大小获得。

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