爆破圆管管壁内分界面形成规律初探

采用约束爆破和自由膨胀爆破两种实验方法,研究了工业纯铁,Mn-B系空冷贝氏体钢等五种材料在爆破加载条件下管壁变形、开裂特征和破片形成规律.依据宏观断口特征和破片金相组织分析的结果,将管壁组织演化及裂纹形成划分为四种不同的类型,它们对应着四种不同的变形破坏机制.不同机制形成的变形破坏区之间存在"分界面", 共发现四种分界面.采用"三层结构模型"分析了受力状态与分界面的形成之间的关系.探讨了炸药、材料性能、管壁结构等因素对分界面形成规律的影响.

Study on formation of interfaces in wall of exploded cylinder

By means of a constrained expansion and a free expansion explosion tests, the deformation and crack characteristics and the formation rules of fragments of the cylinder walls made of five kinds of materials under the condition of explosive loading were investigated. On the basis of the characteristics of macro-fractures and the analyzed results of the microstructures of fragments, the microstructural evolutions and the formations of cracks of the cylinder walls are differentiated into four kinds of types, so four kinds of deformative destructive mechanisms correspond to them. The research results show that interfaces exist between neighboring deformed layers formed by different mechanisms. Four kinds of interfaces were found. A three-layer-structure model was adopted to analyze the relationship between the loading conditions and the formations of interfaces. The effects of explosives, properties of materials and structures of cylinder walls and so on on the formation rules of the interfaces are discussed, too.