On the resistance of ceramics to high velocity penetration
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It is known that high velocity penetration for ductile materials can be represented analytically by a modified hydrodynamic theory. The strength term for the target corresponds to the pressure required to expand a cavity, if the dynamic yield strength is substituted for the static yield strength. Indentation pressures are closely related to the cavity expansion pressures. In this paper it is shown that the key parameters for indentation in brittle materials are similar to but not identical to those for ductile materials. The strength terms for ceramics as measured in ballistic tests are much lower than would be predicted on the basis of the indentation measurements. It is found that the ratio of the target strength term to hardness increases as the fracture toughness of the targets increases. The findings on penetration resistance are used together with cavity expansion theory to estimate the relative size of the craters in ceramic targets. Keywords: Ceramic materials, Mathematical models, Ceramic armor
NPS Report NumberNPS73-88-001
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