The photographs of the sweep electron microscope show that fatiguedamage are caused mainly by microcracks and impurities of metal.
通过疲劳断口的电镜扫描试验,证明防爆膜的疲劳破坏是由存在于金属内部的微裂纹和杂质所引起。
2
The fatigue invalidation made by the kind of microcosmic and macroscopical mechanical stress concentrate 80% resulted in equipment part and metal components damage.
设备的零部件和金属构件发生的损坏,80%是由于各种微观和宏观机械应力集中所导致的疲劳失效。
3
The fatiguedamage of metal materials has been recognized in engineering field for a long time. And the fatiguedamage problem of metal structures has become more and more serious.