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Abstract: Direct modeling of porous materials under shock is a complex issue. Weinvestigate such a system via the newly developed material-point method. Theeffects of shock strength and porosity size are the main concerns. For the sameporosity, the effects of mean-void-size are checked. It is found that, localturbulence mixing and volume dissipation are two important mechanisms fortransformation of kinetic energy to heat. When the porosity is very small, theshocked portion may arrive at a dynamical steady state; the voids in thedownstream portion reflect back rarefactive waves and result in slightoscillations of mean density and pressure; for the same value of porosity, alarger mean-void-size makes a higher mean temperature. When the porositybecomes large, hydrodynamic quantities vary with time during the wholeshock-loading procedure: after the initial stage, the mean density and pressuredecrease, but the temperature increases with a higher rate. The distributionsof local density, pressure, temperature and particle-velocity are generallynon-Gaussian and vary with time. The changing rates depend on the porosityvalue, mean-void-size and shock strength. The stronger the loaded shock, thestronger the porosity effects. This work provides a supplement to experimentsfor the very quick procedures and reveals more fundamental mechanisms in energyand momentum transportation.

Autor: Aiguo Xu, Guangcai Zhang, X. F. Pan, Jianshi Zhu


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