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Modelling of the PELE fragmentation dynamics

Author: Verreault, J.
Type:article
Date:2014
Publisher: Institute of Physics Publishing
Source:Journal of Physics: Conference Series 500 (2014) 18th Biennial International Conference of the APS Topical Group on Shock Compression of Condensed Matter, APS-SCCM 2013 in Conjunction with the 24th Biennial International Conference of the International Association for the Advancement of High Pressure Science and Technology, AIRAPT 2013, Seattle, WA, USA, 7-12 July 2013, Part 15, 500
Identifier: 502121
doi: doi:15/152015
Article number: 152015
Keywords: Weapon systems · Projectiles · Continuum mechanics · Finite element method · Fracture mechanics · Projectiles · Residual stresses · Semiconductor insulator boundaries · Cylindrical shell · Experimental investigations · Finite-element method (FEM) simulation · Fragmentation dynamics · Mechanical stress · Numerical results · Penetrator with enhanced lateral effects · Radial deformation · Dynamics · High Tech Systems & Materials · Industrial Innovation · Mechanics, Materials and Structures · WS - Weapon Systems · TS - Technical Sciences

Abstract

The Penetrator with Enhanced Lateral Effect (PELE) is a type of explosive-free projectile that undergoes radial fragmentation upon an impact with a target plate. This type of projectile is composed of a brittle cylindrical shell (the jacket) filled in its core with a material characterized with a large Poisson's ratio. Upon an impact with a target, the axial compression causes the filling to expand in the radial direction. However, due to the brittleness of the jacket material, very little radial deformation can occur which creates a radial stress between the two materials and a hoop stress in the jacket. Fragmentation of the jacket occurs if the hoop stress exceeds the material's ultimate stress. The PELE fragmentation dynamics is explored via Finite-Element Method (FEM) simulations using the Autodyn explicit dynamics hydrocode. The numerical results are compared with an analytical model based on wave interactions, as well as with the experimental investigation of Paulus and Schirm (1996). The comparison is based on the mechanical stress in the filling and the qualitative fragmentation of the jacket.