Numerical Simulation of Shock Propagation in Heterogeneous Solids

摘要: Hypervelocity impacts of asteroids and comets on Earth other planets lead to shock compression the affected rocks. Heterogeneities, which are ubiquitously present in rocks, likely influence dynamic behavior geological materials under loading. The presence small-scale heterogeneities like lithological interfaces, fractures, pores, etc. propagation, magnitude, geometry subsequent release waves need be considered if pressure temperature achieved during an impact process derived base observed effects. In this study, we performed numerical simulations using hydrocode SALE analyze effects a simple planar interface wave behavior, determine magnitude temperature, pressure, density near interface. simulated materials, their geometries, scale model adapted recovery experiments. ANEOS equation state has been employed. samples either composed rectangular pieces quartzite dunite enclosed iron container impacted by flyer plate, or consisting with wedge-shaped inclusion presenting inclined slab. computations indicate that compression, pressures temperatures quartzite, completely reversible solid-solid phase transitions target material start develop at Shock heating alone is not sufficient for melt formation systems but localized shear particular boundaries between different results significant additional rise up 400 K addition regular model. Further mechanisms energy dissipation needed proper description experimentally melting.