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中文摘要：
以断裂力学为基础,根据复合型裂纹断裂判据建立了LY12CZ铝合金材料微动疲劳裂纹扩展寿命预测模型,确定了模型中的参数,通过预测寿命与试验值的对比验证了该模型的正确、有效性。研究结果表明,微动疲劳裂纹形成阶段比较快,其寿命只占整个疲劳寿命的20%～25%,结构失效所消耗的时间主要在裂纹扩展阶段。
英文摘要：
A new model for predicting propagation life of fretting fatigue crack of aluminum alloy LY12CZ was established based on part mechanics and part criterion of composite crack.Parameters of the model were determined.The correctness and validity of the model were validated according to the contrast of experiment life and predicting life.The results showed that fretting fatigue crack formation is fast and its propagation life is only 20 to 25 percent of the total fatigue life,which means the failure life of structure is mainly in the propagation phase.
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