高温条件下薄壁圆柱筒高速碰撞试验

Study on high velocity impact experiment of thin cylinders at elevated temperature

为研究高温条件下薄壁圆筒高速撞击靶体的动力学响应,该文基于理论和试验分析影响加热/保温、撞靶速度和姿态的诸多因素,研究可以加温的高速撞击试验技术,分别采用次口径发射技术、间接测温技术和高速摄影技术等实现薄壁圆柱筒的加热、保温、加速和姿态控制和测试等,研究高温条件下薄壁圆柱筒的高速撞击响应。研究结果表明:整体刚度较大的薄壁圆柱筒在高温条件下与刚性靶正碰时,碰撞端撴粗,尾端收缩,两端发生凹陷变形,尾端的凹陷大于碰撞端的凹陷变形;侧碰时,试样整体变形成马鞍状,碰撞侧的变形呈扁平状;端部角碰时,碰撞端的变形呈楔形,与碰撞角密切相关,尾部也发生凹陷。整体刚度偏弱的薄壁圆筒碰撞时整体坍塌,出现大量褶皱。

In order to study the high velocity impact responses of thin cylinders with sealed end at elevated temperatures,the impact experiment techniques at high temperature were studied by combination of theory method and experiment method.The issues of heating,insulating,impact velocity and gesture controlling were studied.Missile-borne heater was produced based on subcalibre technique and heating technique,which was not used to heat and insulate the sample,but also to accelerate the sample and to control the gesture.The temperature was measured by indirect method.The gesture was monitored by high speed photography.The following could be concluded from the studies on cylinder normally impacting on rigid target.The impact end was upset while the other end was contracted.Both ends subsided,and the cave depth of impact end was smaller than the opposite end.At lateral impact,the deformation of cylinder was like a saddle with a flat impacting side.At oblique impact,the impacting end became a wedge while the other end subsided.When the strength and rigidity became smaller,the deformation became larger,and the cylinder collapsed with many folds.