Numerical analysis on impact safety of fuel air explosive

Fuel air explosive (FAE), different from high energyexplosive is a three-phase medium consisting of metal solid particles, waterand gas. Its mechanical behavior is affected by initial condition andloading condition. In this paper a three-phase material model for FAEexplosive subjected to shock loading was presented. In the model the FAEexplosive was modeled as a three-phase mixture which contains solid metalparticles, water and gas. The solid metal particles formed a skeletonstructure. The liquid and gas were filled in the void of the skeletonstructure. In addition, the gas adiabatic compression model was introduced.The profiles of stress and temperature of individual phases could be showedin the material model. Hence it could be a way to reasonably validate thesafety of fuel. This material model was embedded into dynamic softwareAUTODYN as user subroutines. Finally, the model was applied to analyze theresponse of the FAE charge when the FAE warhead was dropped from 20m highdown to steel plate vertically. Based on the stress status and temperaturedistribution in the charge, the safety of FAE charge was discussed.