缺陷对圆管膨胀断裂影响的实验研究  

Experimental Study on the Influences of Defects on Expanding Fracture of a Metal Cylinder

作　　者：金山[1] 张世文[1] 龙建华[1] 

机构地区：[1]中国工程物理研究院流体物理研究所,冲击波物理与爆轰物理国防科技重点实验室,四川绵阳621900

出　　处：《高压物理学报》2011年第2期188-192,共5页Chinese Journal of High Pressure Physics

摘　　要：采用高速分幅摄影技术,通过对比实验,获得了清晰的无缺陷和预制缺陷金属圆管膨胀断裂的演化图像。实验结果表明,缺陷大大加速了圆管的断裂过程;有缺陷圆管的产物开始泄漏的时间比无缺陷圆管提前5.5μs,采用应力/应变集中法很好地解释了这种现象。另外,针对预制缺陷圆管膨胀断裂时出现的裂块较小而数量较多、无缺陷圆管膨胀断裂时裂块相对较大而数量较少的现象,采用Mott波理论进行了合理的解释。By means of high-speed frame photography,clear images of the expanding fracture of two metal cylinders with and without a notch were obtained.The experimental results showed that the notch defect would significantly accelerate the fracture process of the cylinder.For the metal cylinder containing a prefabricated notch,the leakage time of detonation products（5.5 μs） is earlier than that without a notch,which can be satisfactorily explained by stress or strain concentration.Furthermore,using Mott wave theory,it is well explained that the fragments of the metal cylinder with a notch defect are smaller and more abundant than that without defect.

关 键 词：爆炸力学 圆管 缺陷 膨胀断裂 Mott波 

分 类 号：O346.1[理学—固体力学] O343.4[理学—力学]