Dynamic Loading of Porous Inert and Energetic Materials
NAVAL SURFACE WARFARE CENTER INDIAN HEAD DIV MD INDIAN HEAD United States
Pagination or Media Count:
Bed compaction occurs throughout the various stages of deflagration-to-detonation transition DDT. As burning begins, compressive waves compact the adjacent porous bed, thereby restricting gases flow and increasing the pressure buildup. Stronger compressive waves coalesce into a compaction front, where rapid pore collapse creates hot spots and initiates compressive reaction. Rapid growth of compressive reaction will strengthen the compaction front into a shock wave that can then transit to detonation. Experimental techniques were developed for driving quasi-steady fronts into porous beds at pressures of interest to DDT, ranging from 15 to 500MPa. A variety of explosives and propellants were studied, along with some inert materials to avoid any influence from reaction. Measurements were made during the compaction process of the front velocity, the state of the compacted bed behind the front in the absence of reaction, the time for the onset of compressive reaction, the pressure growth and increased front velocity from reaction, and the time and distance to detonation. These data were related to DDT experiments on some of the same materials.