The computational modeling linkage from the atomistic to the continuum scales of homogeneous and discrete deformation mechanisms (twinning, cleavage, micro-cracking, stacking faults, et cetera), nano- and microstructure and defects, to dynamic failure processes in brittle materials should provide pathways to designing improved mechanical performance through controlled processing. This report will review results from an internal multiscale computational program in first-principles design of armor ceramics, with a focus on an optically ...
Material failure through microscale shear localization is a significant parameter in design of applications involving high deformation rates. Experiments and continuum analysis (Wright, 2002) have shown sudden stress collapse via shear localization may be related to velocity or strain rate perturbations in the vicinity of shear band initiation. This paper examines the validity of a recently developed perturbed-continuum model for predicting the timing of stress collapse. Perturbed-continuum models for rationalizing ...
Reports by Author
