Acquisition of the Variable Temperature Relaxation Modulus of Modified Double Base Propellant
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LI Yao, XU Jin-sheng and ZHOU Chang-sheng
The relaxation modulus curve of modified double-base propellant under constant temperature was obtained by stress relaxation tests at different temperatures. According to the time-temperature equivalent principle, the relaxation modulus main curve and time-temperature equivalent model were established by regression analysis method. The relaxation modulus curve of variable temperature is based on the relaxation modulus obtained under different constant temperature levels. By establishing the relaxation modulus main curve and the time-temperature equivalent model, the variation of mechanical properties of materials with temperature is obtained. The results show that the main relaxation modulus curve based on Prony series data fitting has high accuracy and convenient data processing, so it is suitable for obtaining the relaxation modulus of modified double-base propellant with variable temperature.
Relaxation modulus, viscoelastic, equivalent factor of time and temperature, modified DB propellant