Mechanism of material microstructure on the fragmentation results of explosively driven metal cylinders based on fracture modes

There are many complicated fracture modes during the expansion and fracture of metal cylinders under explosive loading. The fracture mode directly affects the masses and number of fragments, that is, the distribution of fragment masses with number. However, the understanding of the factors and mechanisms that substantively affect the result of crushing is not comprehensive enough. In this paper, through macroscopic and microscopic observation of the fragments formed by explosively driven metal cylinders, the fracture modes were analyzed. And the mechanism of material microstructure on fragment mass statistics was investigated. It was found that the small and large mass fragments had different fracture modes, and the mechanism of the two kinds of fragments on the fragment mass distribution was different: (1) The scale parameter μ, which characterized the mass distribution of fragments, mainly depended on the number of small mass fragments, and the influence of large mass fragments was small. (2) The intergranular fracture of small mass fragments led to the influence of grain size on the masses and number of small mass fragments.