Shock induced hot-spot formation and subsequent decomposition in granular, porous hexanitrostilbene explosive

摘要: Experimental and theoretical studies on granular, porous hexanitrostilbene (HNS) explosive have yielded an increased understanding of microstructural processes occurring during initiation by shock loading. Experiments involved the planar impact HNS specimens onto fused-silica targets. Chemical decomposition liberated gaseous products, causing pressure in to rise. Velocity interferometry measured material velocity, hence, at fused silica/HNS interface. An analysis this excursion yields chemical history. The data are interpreted terms a quantitative two-temperature model which considers hot spots be formed pore sites as result irreversible work accompanying shock. Subsequently, completion is achieved burn fronts propagate radially out from each spot velocity can determined bulk rate. Analysis experimental context several important results: delay times corresponding hot-spot shorter than expected; calculations show about same inferred temperature for different initial porosities particle sizes HNS, shock-loaded equal pressures, consistent with results.