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为获得抗拉强度主曲线,基于动态储能模量主曲线、应力松弛模量主曲线和Griffith方程,建立了固体推进剂动态和静态单向拉伸力学性能之间量化关系,即考虑温度折算后,推进剂抗拉强度之比等于动态模量相应变换后的均方根之比。依据这种关系,可从动态模量主曲线估算出推进剂在任意温度和拉速下的应力值,进而绘制成抗拉强度主曲线。将计算值与实测值进行对比,结果较一致。利用所得抗拉强度主曲线,可推广用于评估推进剂药柱是否具备承受点火冲击的力学性能。
In order to get the main curve of tensile strength, based on the main curves of dynamic storage modulus, principal stress relaxation modulus and Griffith equation, the quantitative relationship between dynamic and static uniaxial tensile mechanical properties of solid propellant was established, After, the ratio of the tensile strength of the propellant is equal to the ratio of the root mean square of the transformed dynamic modulus. According to this relationship, the main curve of dynamic modulus can be used to estimate the stress value of propellant at any temperature and pulling speed, and then draw the main curve of tensile strength. Comparing the calculated value with the measured value, the results are more consistent. The main curve of tensile strength can be used to evaluate whether the propellant grains possess the mechanical properties of igniting impact.