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本文通过对HTPB复合固体推进剂在宽广温度范围内、定应变条件下单轴应力松弛的实验测定,根据线性粘弹及热流变简单性的基本假设,将-50℃到80℃间+一个温度下的应力松弛曲线,采用时间～温度折合变量的数据处理方法,迭加成-40℃、20℃及70℃三个参考温度下主松弛模量随推进剂时间特性的变化曲线,并用Prony级数式及修正的幂函数式描述;还通过玻璃化转变温度的测定和图解法求出的时间～温度偏移因子建立了该推进剂材料修正的WLF方程;同时就端部粘木试样和传统的哑铃形试样对试验结果的影响进行了比较。
In this paper, HTPB composite solid propellant in a wide temperature range, the uniaxial stress relaxation under constant strain experimental determination, according to the basic assumption of linear viscoelastic and thermal rheology simplicity, will be between -50 ℃ to 80 ℃ + a temperature Under the stress relaxation curve, the data processing method of the time ~ temperature equivalent variable was used to superpose the curve of the main relaxation modulus with the time characteristics of the propellant under the three reference temperatures of -40 ℃, 20 ℃ and 70 ℃, And the modified power function description. The WLF equation of the propellant material was also established by measuring the glass transition temperature and the time-temperature offset factor obtained from the graphic method. At the same time, The dumbbell samples were compared for their impact on the test results.