When the inclusion size in the spring steel is larger than the critical size of inclusions, the probability of fatigue failure will increase.

当弹簧钢中的夹杂物尺寸大于临界夹杂物尺寸时，容易造成疲劳强度失效。

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In this paper, multidimensional probability model of random fatigue failure was established and the random simulating formula of failure distribution function was deduced.

本文建立随机疲劳失效的多维概率模型。论述推导机械零件疲劳失效分布的随机模拟公式。

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In response to the complexity of calculation for failure probability regarding fatigue crack growth life, a method for reliability analysis based on neural network response surface was presented.

针对疲劳裂纹扩展寿命失效概率计算的复杂性，提出基于神经网络响应面的可靠性分析方法。

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