Study on Axial Dispersion Characteristics of Double-Layer Prefabricated Fragments

Abstract

The axial distribution of initial velocity and direction angle of double-layer prefabricated fragments after an explosion were investigated via an explosion detonation test. A three-stage detonation driving model of double-layer prefabricated fragments was proposed. In the three-stage driving model, the acceleration process of double-layer prefabricated fragments is divided into three stages: “detonation wave acceleration stage”, “metal–medium interaction stage” and “detonation products acceleration stage”. The initial parameters of each layer of prefabricated fragments calculated by the three-stage detonation driving model of double-layer prefabricated fragments fit well with the test results. It was shown that the energy utilization rate of detonation products acting on the inner-layer and outer-layer fragments were 69% and 56%, respectively. The deceleration effect of sparse waves on the outer layer of fragments was weaker than that on the inner layer. The maximum initial velocity of fragments was located near the center of the warhead where the sparse waves intersected, located at around 0.66 times of the full length of warhead. This model can provide theoretical support and a design scheme for the initial parameter design of double-layer prefabricated fragment warheads.

Editorial for the Special Issue “Materials under High Pressure”

“…He et al [ 4 ] investigated the axial distribution of the initial velocity and direction angle of double-layer prefabricated fragments after an explosion. A three-stage detonation driving model of double-layer prefabricated fragments was proposed.…”

“…The interaction between explosion products and materials is very quick, and the strain rate could be extremely high. Preformed fragments can deform or even fracture when subjected to contact blasts, which might lead to a reduction of the terminal effect [ 3 , 4 , 5 ]. To solve this problem, Meng et al [ 5 ] analyzed the effect of surface electroplating on the fragment deformation behavior under contact blasts.…”

“…The deformation and failure of materials under high pressure are related to structural optimization and equipment design [ 4 , 8 , 13 , 14 ]. The electronic components inside a main battle tank (MBT) are the key components by which the tank exerts its combat effectiveness.…”