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利用裂纹扩展速率的Ｐａｒｉｓ公式，将应力幅值Ｓｒ和材料参数Ｃ作为随机变量，应用概率中心极限定理推导出在随机载荷作用下构件的裂纹长度和疲劳寿命的概率密度函数．在此基础上得出构件的疲劳可靠度．
Using the Paris formula of crack growth rate, the stress amplitude Sr and the material parameter C are taken as random variables. The probability density function of the crack length and fatigue life under the random load is deduced by using the probability central limit theorem. Based on this, the fatigue reliability of the component is obtained.