Numerical simulation of formation and acceleration of high-density alloy fragments in a small-calibre short-range round
Authors: Zavora I.V., Imkhovik N.A.
Published in issue: #5(77)/2018
DOI: 10.18698/2308-6033-2018-5-1767
Category: Mechanics | Chapter: Mechanics of Deformable Solid Body
The article presents results of numerical simulation and experimental studies of the explosion process of a fragmentation grenade from a small-calibre round for a promising automatic grenade launcher. We propose an improved design of a fragmentation shell fora 40 mm round that features annular controlled fragmentation regions made of a tungsten-based high-density alloy. We show that automated parametric meshing of components ofa small-calibre round is possible. The study deals with the basic stages of forming and accelerating controlled fragments out of uniformly notched rings. We detected a range of triangle-shaped associated fragments generated via shear deformation in the notching sites. We provide static explosion test results for mockups of 40 mm fragmentation rounds featuring a set of rings manufactured by means of powder injection moulding. Statistical processing of mass and size characteristics in the fragment distribution obtained led to determining average acceleration velocity of the controlled fragments. We show that our numerical simulation converges with experimental data in terms of mass, geometrical and velocity characteristics of controlled fragments and their corresponding fragment distribution.
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