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.
介绍了型砂塑性变形临界值、回弹势能的概念及其测试方法；
The conceptions and testing methods of the plastic deformation threshold and springback potential are introduced.
用计算机技术和传感技术组成系统构成型砂多项性能测试仪，测定湿型粘土砂塑性变形临界值。
Critical value of plastic deformation of green sand has been tested by molding sand multi-tester using computer and sensors.
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