On the Attenuation of Diverging Shock Waves in a Porous Material
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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Several approximate theories for predicting the attenuation rate of shockwaves in porous materials are developed. The material is assumed to be an ideal locking solid. Cylindrical and Spherical geometries are considered, with the shockwave assumed to be generated by several different mechanisms, including the instantaneous deposition of momentum and the rapid deposition of energy over the interior of a cavity in the porous material. The generation of shockwaves through the adiabatic expansion of a cavity filled with an ideal gas at high pressure is also considered with a model based on conservation of momentum and a model based on conservation of energy. The predictions of six simple models are compared for the case of a cylindrical wave in a material having low porosity, including a model which is analagous to the familiar snowplow model.
- Soil Mechanics