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Penetration Physics of Armor Glass
Final rept. 31 Jul 2006-30 Jun 2009
SOUTHWEST RESEARCH INST SAN ANTONIO TX
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As part of a team working to develop improved ceramic and glass armor, SRI International performed and interpreted experiments designed to elucidate the physics of material failure when attacked by a rod-like projectile. Partially penetrated glass targets were sectioned and examined to observe the fracture damage. Finely comminuted material in advance of arrested penetrators suggested that frictional properties of fragments influence penetration. A test was devised and applied to measure shear resistance of a bed of fragments at high pressure. The results formed the basis for a physics-based model of fracture and flow of glass ahead of a penetrator and, hence, the basis for computational simulations of projectilearmor encounters that can be used for armor design. The partial penetration experiments and findings are described in Section III, and the mesomodel of glass fracture and flow is presented in Section IV. All three sections were presented at meetings of the American Ceramic Society and all were reviewed and published in the proceedings.
APPROVED FOR PUBLIC RELEASE