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利用动态热机械分析研究了一组不同RDX含量的改性双基推进剂的动态力学性能。根据“时间-温度”等效原理的WLF方程获得了该推进剂体系α松弛的粘弹系数Cg1,Cg2和主曲线叠合的垂直位移因子bT以及松弛过程的活化能Ea。结果表明,随着固体填料(RDX)含量的增加,该推进剂的储能模量下降,α松弛的损耗角正切(tanδ)的峰温逐渐降低,以tanδ为代表的力学损耗强度逐渐增大,而β转变所对应的温度不变。用自由体积理论解释了固体含量对改性双基推进剂动态力学性能的影响。
Dynamic mechanical properties of a modified double base propellant with different RDX contents were studied by means of dynamic thermo-mechanical analysis. The viscoelastic coefficient Cg1, Cg2 of the relaxation system α and the vertical displacement factor bT of the main curve stack and the activation energy Ea of the relaxation process are obtained according to WLF equation of “time-temperature” equivalence principle. The results show that with the increase of RDX content, the storage modulus of the propellant decreases, the peak temperature of loss tangent of α relaxes gradually decreases, and the strength of mechanical loss, such as tan δ, gradually increases , While the corresponding temperature β transformation unchanged. The free volume theory is used to explain the influence of solid content on the dynamic mechanical properties of modified double base propellants.