利用超声疲劳试验设备对LZ50钢进行变幅疲劳性能的研究同时用扫描电子显微镜（SEM）观察分析了疲劳断口的形貌特征。试验采用荷载步线型累加的加载形式，选取最大荷载σhigh为390 MPa。结果表明：经过小荷载作用后的实验材料其疲劳性能有显著增强，表现出明显的Coaxing效应；引入强化因子对Palmgreen-Miner累积损伤准则进行修正，经修正后的Palmgreen-Miner累积损伤准则能较好地预测材料使用工况下的变幅寿命。
Variable amplitude fatigue properties of LZ50 steel were investigated with ultrasonic fatigue testing equipment. Fatigue tests were performed with a linear step accumulative loading. The maximum stress was selected at 390 MPa. The fracture surfaces of specimens were investigated with scanning electron microscopy(SEM). The experimental results show a marked Coaxing effect. The Palmgreen-Miner damage formula was verified based on the step-loading fatigue experiment result of LZ50 steel. It is indicated that the calculation result of the formula is of higher precision and it approaches the experimental result.
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