Fragment distribution of prismatic casings under one-end detonation conditions
J.-G. Ning, Q. Wang, J.-Q. Li
State Key Laboratory of Explosion Science and Safety Protection, Beijing Institute of Technology, Beijing, China
Keywords: prismatic shell, explosive load, fragment velocity, dispersion angle, dimensional analysis
Abstract
As a typical non-cylindrical structure, the prismatic shell with semi-finished fragments is extremely important for the structural design and evaluation of the destruction efficiency of the innovative warhead. The velocity and scattering angles of fragments are important parameters in the creation of the warhead and protective elements. However, the vast majority of existing formulas for the fragment velocity are created specifically for the cylindrical body, and there are very few formulas for calculating the scattering angle as applied to the prismatic body. In this paper, using theoretical analysis, a formula for the fragment velocity from the prismatic body is derived, and equations for both the radial and axial scattering angles of fragments are proposed. The rationality of the formulas was confirmed by experimentally verified numerical results. Ultimately, based on the obtained expressions and orthogonal analysis, the laws of influence of dimensionless geometric parameters on the scattering angle and specific kinetic energy of fragments were established, and the primary and secondary orders of influence of each parameter on the scattering angle and specific kinetic energy were determined, respectively. The results of this work will form the basis for further research into prismatic metal shells and other types of asymmetric shells, as well as a reliable source for the technical design of innovative warheads.
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