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利用扫描电镜（SEM）对靶板层裂破坏崩落块断口形貌进行了分析,结果表明,后崩落块断口可分为三个区域,分别对应裂纹萌生与扩展的不同阶段.中心区域为波浪状拉伸韧窝,这里在熔融状态下受拉应力作用;平坦区为抛物线型韧窝,表明断裂是张开型和滑开型共同作用的过程;侧面为等轴韧窝,说明崩落块最终是被拉应力拉断的.因此层裂过程可分为:开坑挤压及前崩落块的剪切断裂阶段;干涉应力波引起的材料内部裂纹萌生阶段;后崩落块的张开与滑开共同作用的裂纹扩展和弹靶摩擦表面的熔化阶段以及最后的拉伸断裂阶段.整个过程为韧性断裂,这种韧性层裂破坏有时需要比冲塞破坏还要高的能量.
The fracture morphology of cracked blocks in the target layer was analyzed by scanning electron microscopy (SEM). The results show that the fracture of the afterbolt can be divided into three regions, corresponding to the different stages of initiation and propagation of cracks. The central region is wavy Tensile dimples, where the tensile stress in the molten state; flat area for the parabolic dimples, indicating that the fracture is open and sliding together the role of the process; side of the equiaxed dimples, indicating that the collapse of the final block is Is pulled by the tensile stress.So the delamination process can be divided into: open pit extrusion and the collapse of the former collapse of the fracture phase; interference stress wave caused by the initiation of internal cracks in the material; after the collapse of the block open and slide together The role of crack propagation and the melting surface of the target friction surface and the final stage of tensile fracture.The whole process is ductile fracture, this ductile fracture sometimes need more than the crash damage energy.