文章摘要信息 关键词 ： 循环冲击 强度劣化 累积损伤 临界卸载应力 [gap=1690]Keywords : cyclic impact；strength deterioration；cumulative damage；critical unloading stress
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Furthermore, at all impact power, the wear mechanism of the material changes distinctively with the time under the cyclic impact stress.
同时，在各个冲击功下，材料的磨损机理在冲击应力的循环作用下随时间发生明显变化。
The micro morphology of low carbon steel cyclic deformed with low cycle impact fatigue was investigated it was found that the cycle deformation is caused by slipping.
观察了低碳钢在低周冲击疲劳过程中循环形变的显微特征。结果表明：循环形变主要由滑移引起。
Based on the analytic method of cyclic spectrum density, the paper pointed out that the impact frequency could be extracted effectively with the help of scanning cyclic frequency domain.
通过对循环谱密度分析方法的特性分析，指出应用循环谱密度分析方法可以在循环频率域有效提取出滚动轴承的冲击故障频率。
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