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Penetration dynamics of AP8 in thin ceramic tiles

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Author: Abadjieva, E. · Khoe, Y.S.
Type:article
Date:2013
Source:27th International Symposium on Ballistics, Freiburg, Germany, 22-26 April 2013, 1234-1240
Identifier: 471652
ISBN: 9781605951065
Keywords: Ballistics · Ceramic materials · High speed cameras · Projectiles · Silicon carbide · Experimental approaches · Finite element codes · Penetration behavior · Penetration dynamics · Penetration process · Penetration velocity · Projectile diameter · Spatial resolution · Dynamics · Defence, Safety and Security · Mechatronics, Mechanics & Materials · EBP - Explosions, Ballistics & Protection · TS - Technical Sciences

Abstract

The interaction of thin ceramic tiles with AP8 (WC core, 7,62 mm) at 1000 m/s velocity has been studied experimentally and numerically. “Thin” ceramic tiles refers here to ratio of the tile thickness (t) to the projectile diameter, (d), t/d@ 1, as they are both in the same order. The method applied to visualize the penetration dynamics has been described. It consists of two orthogonal X-ray sources each of 1.2 MeV, coupled to high-speed camera and triggered by aluminum foil, placed in front of the ceramic tile. The time resolution of the experimental set-up is ±1 microsecond. The spatial resolution is ±0.2 mm. The size of the tiles that permit very good image quality is 50 mm x 50 mm. The penetration dynamics of AP8 projectile in SiC tile with thickness of 8 mm has been studied both with and without backing to distinguish the different failure mechanisms during the penetration process. The normalized penetration versus time (P,t) and normalized length of the projectile versus time (L,t) curves have been generated. The penetration dynamics of AP8 in the tile with backing is a non-linear process and three different stages, each corresponding to different penetration velocity, have been identified and described. The penetration behavior in the case of stand alone tile (without backing) has linear character. The finite element code LS-Dyna has been applied to gain the spatial and temporal stress distribution and study the observed phenomena numerically. Both numerical and experimental approaches are set complementary to improve the current understanding of fragmentation and penetration dynamics in thin ceramic tiles.