Simulation calculation on neutron radiation shielding properties of aramid fiber reinforced ballistic composites
Aramid fiber reinforced ballistic composites are widely used in armored vehicle protection products because of their excellent fragment protection performances,flame retardant performance and low density.Improving the nuclear protection capabili-ty of the composites can further improve the comprehensive protection capability of armored vehicles.The numerical models of aramid fiber reinforced polyurethane resin matrix composites were established by MCNP software based on Monte Carlo method.The radiation shielding abilities of the composites with different conditions to various energy neutron rays were analyzed.The simu-lation results show that the thermal neutron shielding ability of the composite is little affected and negligible by different molding pressure.With the increase of the resin content,the shielding efficiency of the composite on neutron ray increases linearly,especially for thermal neutron,which is the worst for fast neutrons.Then,with the increase of thickness,the neutron shielding ability of the composite is continuously enhanced,but the increase trend is different,in which the shielding ability for slow and medium neutrons is strong and increases nonlinearly,and finally tends to be stable,and the shielding ability for fast neutrons is weak but increases linearly.In addition,the energy distribution of penetrating neutrons was analyzed by simulation.The results show that aramid fiber reinforced ballistic composites have high moderating effect for slow and medium neutrons and low moderating effect for fast neutrons.
Monte Carlo methodnumerical modelneutron shieldingresin contentthicknessmoderating effect
万方数据
维普
