微观上在少数油管断口中观察到了典型的疲劳辉纹，在很多断口上观察到了疲劳台阶和二次裂纹。
Crack spreading area and transient breaking are observed, typical fatigue striations, fatigue steps and secondary cracks are observed on some of the fractures.
实验发现，激光自脉冲调制与行走辉纹产生的激光噪音有本质区别。
The LSPM has been found to be intrinsically different from the laser noise caused by the moving striation.
没有观察到疲劳辉纹。
疲劳辉纹的形貌特征和位向有一定的相关性。
The correlative nature is revealed between the morphology and orientation of the striations on fatigue fracture surfaces.
焊缝区和热影响区试样的辉纹间距较基体区的大，说明裂纹扩展速率快，焊缝和热影响区的抗裂纹扩展性较基体差。
The striation spacing in heat affect zone and welded seam samples was wider than that in matrix sample, this shows that fatigue crack propagation...
焊缝区和热影响区试样的辉纹间距较基体区的大，说明裂纹扩展速率快，焊缝和热影响区的抗裂纹扩展性较基体差。
The striation spacing in heat affect zone and welded seam samples was wider than that in matrix sample, this shows that fatigue crack propagation...
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