二次撞击
- 网络second impact;DOUBLE KISS
二次撞击-
高能量长叶片撞击将引起大变形，叶片弯曲成U形，机匣在第二次撞击处被撕裂击穿。
The impaction of long blade with high energy can cause large deformation and the blade will curl as U shape and tear the wall of the ring at the second impact position .
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指出当撞块质量和长杆质量的比值满足一定条件时，在第一次撞击过程结束后会发生第二次撞击。
It is shown that for a certain ratio of the mass of the bar to that of the block , the second impact will be happened after the first impact .
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甚至在第二次撞击发生后，南楼还有一条楼梯可通向外面的街道。
Even after the second airplane struck , an open staircase connected the upper reaches of the south tower to the street .