The fatigue damage of the metal material often happens under the action of the dynamic load. The accumulation of fatigue damage of the metal material leads to the result of surface fatigue cracks.
金属构件常常因受到动载荷作用引起疲劳损伤，而疲劳损伤累积的结果往往导致裂纹的产生。
The fatigue damage of the metal material often happens under the action of the dynamic load. The accumulation of fatigue damage of the metal material leads to the result of surface fatigue cracks.
金属构件常常因受到动载荷作用引起疲劳损伤，而疲劳损伤累积的结果往往导致裂纹的产生。
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