摘要
Abstract
The thermal stability and mechanical properties of HMX/RDX mixtures with different component propor-tions were studied.The maximum bond length Lmax,cohesive energy density EC,and mechanical properties of different HMX/RDX mixtures at different temperatures were calculated by molecular dynamics(MD)method.The thermal decom-position performance of different HMX/RDX mixtures was tested by differential scanning calorimetry(DSC)at heating rates of 2,5,10,and 20 K/min.And the detonation parameters of different HMX/RDX mixtures were theoretically calculated by EXPLO 5.The results show that when m(HMX)︰m(RDX)are 90︰10,80︰20,and 70︰30,Lmax of the HMX/RDX mixtures gradually increases and EC gradually decreases with increasing temperature.Lmax and EC of HMX90/RDX10 are relatively small,with low thermal sensitivity and good thermal stability.The decomposition peak temperature Tp0 and thermal explosion critical temperature Tb of different mixtures were calculated based on DSC test results.Tp0 and Tb of HMX90/RDX10 are relatively high,which are 268.12℃ and 277.66℃ respectively,indicating good thermal stability.The mechanical property parameters were calculated by Forcite.The tensile modulus E,bulk modulus K,and shear modu-lus G of HMX90/RDX10 are relatively high,with high hardness and fracture strength,and relatively good mechanical pro-perties.The detonation velocity,detonation pressure,and total detonation energy of HMX90/RDX10 are 9 192.19 m/s,38.43 GPa,and 10.98 kJ/cm3,respectively,indicating relatively high energy.关键词
HMX/RDX混合物/热稳定性/力学性能/分子动力学(MD)模拟Key words
HMX/RDX mixture/thermal stability/mechanical property/molecular dynamics(MD)simulation分类
化学工程
