All kinds of defects appear in the surface of components which under the repeated impact load, and the surface defects make the earlier damage and failure.
在多冲这种动载应力波作用下的零部件大都在多冲的接触表面出现或引发各种缺陷并导致早期损伤失效。
The flaws' forming and expanding mechanism had been analyzed and studied, that was happened on the laser coating under repeated impact load by SEM or some other methods.
对激光涂层进行了多次冲击碰撞试验，并通过SEM等手段分析研究了激光涂层在多冲碰撞载荷下的裂纹形成与扩展机理。
Against the characters of repeated impact load, we pointed out some research methods suitable for the deformation research of repeated impact, and discussed its practicability.
针对多次冲击载荷的性质和特点，提出了几种适合于多冲形变研究的方法，并对其可行性进行了探讨。
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