【摘要】 针对爆轰波对碰驱动下金属圆管对碰区易出现过早断裂的问题,以加环紫铜(T2)圆管作为研究对象,利用高速分幅摄影、脉冲X光照相、VISAR三种测试技术,对其在爆轰波对碰驱动下的变形及破坏过程进行了观测。实验结果显示:在紫铜圆管对碰部位增加保护环结构,可以有效推迟该部位圆管的破裂时间。但同时也发现:加保护环后圆管对碰区会出现射流状超前突起现象。由高速摄影结果与X光照相结果对比分析证实:射流状超前突起物质为圆管表面微喷颗粒与空气冲击波混合形成的雾状结构。另外,采用DYNA3D程序对实验模型进行了模拟,计算结果与实验结果符合较好。最后,利用DYNA3D程序就保护环倒角变化对金属圆管对碰区壳体破裂的影响特征进行了初步分析。更多还原

【Abstract】 The deformation characteristics of copper tube with guard ring under two head-on collision detonation waves were experimentally researched.High-speed frame photography,pulsed X-ray radiography and VISAR interferometer were employed to record the expanding process,radius history and velocity history of the copper tube with guard ring.Experimental results show that guard ring can postpone the collision region shell to rupture.The jet-shaped protuberance was found on collision region of copper tube with guard ring.The jet-shaped protuberance consisted of mass ejection from free surface of copper tube and air shock.The DYNA3D code was utilized to simulate the expanding process of copper tube with guard ring.The calculated results and the experimental results are coincident.The LS-DYNA3D code was used to analyze the influence of guard ring’s fillet on deformation characteristics of metal tube.更多还原