Abstract
Abstract : The objectives of this project were to quantify the strength of shocked ceramics during uniaxial strain and to understand the mechanisms that govern shock wave induced inelastic deformation. Dense, polycrystalline silicon carbide (SiC) was selected for this study and two independent measurement techniques (lateral and longitudinal stress determination using in-material piezoresistance gauges; and combined compression and shear wave propagation) were used to examine the shocked state. Nonlinear elastic response below the Hugoniot Elastic Limit (11.5 GPa) was quantified. In the shocked state, the maximum shear stress increases from 4.5 GPa at the HEL to 7.0 GPa at twice the HEL. The inelastic deformation was interpreted as a combination of in-grain micro-plasticity and highly confined micro-fissures. The results suggest that confinement stress, inherent in shock wave loading, plays a dominant role.
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