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Based on an energy conservation model, the strength offered by a number of
brittle materials has been calculated from depth-of-penetration (DOP) test
results. Each material was completely penetrated by a tungsten carbide cored
projectile of known kinetic energy and the residual penetration into a ductile
aluminium alloy backing material was measured. The energy transferred to the
tile by the projectile has been calculated and has been shown to vary linearly
with the tile thickness. From the energy transferred to the armour tile, the
mean resisting stress that was offered to the penetrator was calculated and for
the materials tested, scaled with the material hardness. This work shows that
for DOP testing, where the projectile remains intact, the measured DOP is merely
a facet of the ceramic’s hardness and not its true ballistic performance. The
possibility of using this method to measure the strength of damaged ceramic is
also discuss
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