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研究了超载对ＬＹ１２ＣＺ铝合金疲劳裂纹起始寿命的影响，得出了超载前后带存活率的疲劳裂纹起始寿命的定量表达式．提出了在变幅载荷下，铝合金切口件疲劳裂纹起始寿命概率分布的预测方法，并进行了实验验证．结果表明这种预测方法是切实可行的．
The effect of overloading on fatigue crack initiation life of LY12CZ aluminum alloy was studied. The quantitative expression of fatigue crack initiation life of the LY12CZ aluminum alloy was obtained. The prediction method of the probability distribution of fatigue crack initiation life of aluminum alloy notch under fluctuating load was put forward and the experimental verification was carried out. The results show that this prediction method is feasible.