Prediction of Effective Elastic Modulus of Polymer Bonded Explosive Based on Digimat

Using Digimat-FE, a representative volume element (RVE) model was constructed that reflects the true mesostructure of PBX explosives. The model consists of three phases of explosive particles, binder and pores. Through Digimat-MF, various factors affecting the effective elastic modulus of PBX explosives were investigated, including the elastic modulus, volume fraction, morphology, gradation, porosity and pore diameter of the explosive particles. The calculation results show that the higher the volume fraction of explosive particles, the larger the effective elastic modulus of PBX, and the increase of the effective elastic modulus of PBX is obviously increased when the volume fraction exceeds 60%. The morphology of the explosive particles has little effect on the effective elastic modulus of the PBX explosive, while the grading of the explosive particles has a great influence. The existence of pores makes the effective elastic modulus of PBX explosives significantly reduced, and the increase of porosity makes the effective elastic modulus decrease exponentially; the increase of pore diameter makes the effective elastic modulus of PBX explosives decrease.