A Nonlinear Thermomechanical Model of Spinel Ceramics Applied to Aluminum Oxynitride (AlON)

摘要: A continuum model is developed for describing deformation and failure mechanisms in crystalline solids (ceramics minerals) with the cubic spinel structure. The constitutive describes response under conditions pertinent to impact loading: high pressures, strain rates, and, possibly, temperatures. Nonlinear elasticity, anisotropy, thermoelastic coupling, dislocation glide, twinning, shear-induced fracture, pressure-induced pore collapse are addressed. applied enable an improved understanding of transparent ceramic aluminum oxynitride (AlON). Calculations demonstrate accurate depiction hydrostatic shear stresses observed experimentally shock-loaded polycrystalline AlON. Various choices initial resistances slip, or fracture that result similar predictions average polycrystals but different defect densities (accumulated dislocations twin volume fractions) investigated. Predictions single crystals provide insight into grain orientation effects not available from previous experimental investigations.