Abstract
Abstract : The goal of the program was to characterize and quantify physical processes involved in failure of brittle materials under impact loading conditions, and to synthesize results to identify properties which determine the effectiveness of a system (material and configuration) in resisting failure. This was accomplished by developing new methodologies which integrate concepts in mechanics and materials science. Among the accomplishments are: determining the pressure-shear response of alumina powders and of soda-lime glass at very high strain rates; investigating failure waves in glasses by using pressure-shear impact; measuring the pressure-shear response of pure tungsten carbide at temperatures up to 700 degrees centigrade; developing an analytical/computational theory of fragmentation based on a cohesive zone model; developing an experimental method to characterize the fragmentation response of ceramics; measuring dynamic fragmentation characteristics for alumina and silicon nitride; developing an experimental method to study biased damage evolution and projectile deflection in penetration processes.
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