研究了加载频率和超载对ＬＹ１２ＣＺ铝合金切口件在３．５％ＮａＣｌ溶液中腐蚀疲劳裂纹起始（ＣＦＣＩ）寿命的影响。结果表明，当加载频率ｆ≥１Ｈｚ时，频率对ＣＦＣＩ寿命无显著影响；拉伸超载显著延长铝合金ＣＦＣＩ寿命。超载延寿效应的程度取决于由超载引起的切口根部局部应变值。依据实验结果与分析，给出反映超载影响的ＣＦＣＩ寿命表达式，并对超载延寿效应的机制进行了探讨。
Effect of loading frequency and overloading on corrosion fatigue crack initiation (CFCI) life of notched aluminum alloy LY12CZ specimens in 3.5% NaCI solution were investigated. The frequency had no considerable effect on the CFCI life at the frequency range from 10 Hz to 1 Hz. Tension overloads prolonged the CFCI life, especially in the longer life range. The overloads increased the CFCI threshold value considerably, but had less effect on the CFCI resistance coefficient. The CFCI threshold was in proportion to the strain value at the notch roots caused by overloads. Based on analysis of the experimental results a CFCI life expression, which revealed the quantitative effect of overloading, was put forward. The mechanism of overloading effect was discussed.
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