试验结果表明，对于高灰分煤尘，在冲击波的多次冲击下煤尘的爆炸特性明显增强，危险性大大增加。
These experiments have proved that, for the coal dust with high ash component, after multiple actions by shock wave, it's explosive characteristic has been greatly increased.
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。
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.
本研究进行了渗硼试样的拉伸、多次冲击以及旋转弯曲疲劳试验，并与未渗硼试样进行比较。
In the present study, tensile and repeated impact as well as rotated-bending fatigue tests were carried out.
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