同时也分析了冲头对圆管碰撞时，导致圆管由弹性变形向塑性变形转化学的临界速度值。
We also analyse the critical velocity, at which elastic deformation translate to plastic deformation when the bullet impact the tube.
碰撞接触容易引起塑性变形，这种变形与踏面形状无关，应注意消除轮轨间的不平顺。
The plastic deformation would more easily occur due to the impact contact, but it is independent to the shape of tread. However, to eliminate the irregularity between the wheel and rail is necessary.
以汽车碰撞模拟试验系统中台车与吸能器之间的碰撞接合为例，设计弹-塑性缓冲结构。
By studying crash-connection between the sled and the absorber of car crash simulation system, the buffer of elastic-plastic material structure is designed.
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