TY - GEN
T1 - Mesoscale modeling of dynamic failure of ceramic polycrystals
AU - Clayton, J. D.
AU - Kraft, R. H.
PY - 2011
Y1 - 2011
N2 - Mesoscale models are used to study dynamic deformation and failure in silicon carbide (SiC) and aluminum oxynitride (AlON) polycrystals. Elastic and anisotropic elastic-plastic crystal models represent mechanical behavior of SiC and AlON and grains, respectively. Cohesive zone models represent intergranular fracture. Failure data that can be used to inform macroscopic continuum models of ceramic behavior are collected and analyzed. Studied are effects of grain morphology, specimen size, and applied stress state on behavior of polycrystalline aggregates loaded dynamically at applied strain rates on the order of loVs. Results for SiC demonstrate shear-induced dilatation, increasing shear strength with increasing confinement or pressure, increasing strength with decreasing specimen size (in terms of number of grains), and decreasing strength variability with decreasing size. Results for AlON demonstrate increased initiation of slip activity - particularly in the vicinity of constrained grain boundaries - with confinement.
AB - Mesoscale models are used to study dynamic deformation and failure in silicon carbide (SiC) and aluminum oxynitride (AlON) polycrystals. Elastic and anisotropic elastic-plastic crystal models represent mechanical behavior of SiC and AlON and grains, respectively. Cohesive zone models represent intergranular fracture. Failure data that can be used to inform macroscopic continuum models of ceramic behavior are collected and analyzed. Studied are effects of grain morphology, specimen size, and applied stress state on behavior of polycrystalline aggregates loaded dynamically at applied strain rates on the order of loVs. Results for SiC demonstrate shear-induced dilatation, increasing shear strength with increasing confinement or pressure, increasing strength with decreasing specimen size (in terms of number of grains), and decreasing strength variability with decreasing size. Results for AlON demonstrate increased initiation of slip activity - particularly in the vicinity of constrained grain boundaries - with confinement.
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U2 - 10.1002/9781118095256.ch21
DO - 10.1002/9781118095256.ch21
M3 - Conference contribution
AN - SCOPUS:82355183643
SN - 9781118059906
T3 - Ceramic Engineering and Science Proceedings
SP - 237
EP - 248
BT - Advances in Ceramic Armor VII - A Collection of Papers Presented at the 35th International Conference on Advanced Ceramics and Composites, ICACC
PB - American Ceramic Society
T2 - Advances in Ceramic Armor VII - 35th International Conference on Advanced Ceramics and Composites, ICACC
Y2 - 23 January 2011 through 28 January 2011
ER -