一种利用动态模量主曲线估算抗拉强度主曲线的方法

A method of estimating tensile strength master curves using dynamic storage modulus master curves

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 obtain tensile strength master curve, based on the dynamic storage modulus master curve, the relaxation modulus master curve of solid propellants and Griffith equation, quantitative relations between dynamic and static uniaxial tension property of the solid propellants were established. The ratio of the tensile strength of solid propellants after converting temperature was equal to the root-mean-square ratio of dynamic modulus after some transform. According to this relation, the stress of solid pro- pellants under any temparature and tensile speed was estimated from the dynamic storage modulus master curve, thereby the tensile strength master curve was plotted. The comparison results show that the predicted data is close to the tested data. The tensile strength master curve can evaluate whether the propellants have the mechanical properties to bear ignition impact.