结果表明：铸铁的石墨形态对疲劳裂纹的萌生及扩展有很大影响。
The results show that graphite morphology of cast irons had great effects on initial fatigue crack and propagation behavior.
确认螺栓机加工不当引起疲劳裂纹的萌生及扩展，加之螺栓受力不均匀加速了疲劳断裂过程。
The results showed that manufacturing defects of the bolt resulted in initiation and propagation of fatigue crack, and uneven loading of the bolt speeded up failure process of fatigue fracture.
电镜分析指出，复相组织疲劳性能高的原因是复相组织中的下贝氏体回火后析出短杆状碳化物，能有效地阻止疲劳裂纹的萌生及扩展。
TEM analysis reveals that the precipitation of short-bar-shaped carbides in lower-bainite can prevent effectively from initiation and propagation of fatigue cracks.
在频率比确定的条件下，载荷比是影响双频疲劳裂纹萌生及扩展的一个重要因素。
On constant frequency ratio, loading ratio has an importance influence on the initiation and propagation of fatigue crack under double frequency complex loading.
在频率比确定的条件下，载荷比是影响双频疲劳裂纹萌生及扩展的一个重要因素。
On constant frequency ratio, loading ratio has an importance influence on the initiation and propagation of fatigue crack under double frequency complex loading.
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