Detonation gas model for combined finite-discrete element simulation of fracture and fragmentation

The equation of state for expansion of detonation gas together with a model for gas ow through fracturing solid is proposed and implemented into the combined nite-discrete element code. The equation of state proposed enables gas pressure to be obtained in a closed form for both reversible and irreversible adiabatic expansion, while the gas ow model proposed considers only 1D compressible ow through cracks, hence avoiding full 2D or 3D gas ow through the fracturing solid. When coupled with nite-discrete element algorithms for solid fracture and fragmentation, the model proposed enables gas pressure to be predicted and energy balance to be preserved.