准确的线粘弹性本构参数是进行装药结构完整性分析的基础。文中基于遗传算法提出了复合推进剂单轴松弛模量和体积松弛模量的实验获取方法。通过实验获得了HTPB推进剂的单轴松弛模量参数。将传统方法和文中所用方法进行对比,结果显示基于遗传算法获得的单轴松弛模量数据更加准确,弥补了传统方法不准确的缺点。对单轴拉伸情况下HTPB推进剂线性粘弹性本构模型的适用性进行了讨论,确定了其适用范围。提出的体积松弛模量获取方法对实验设备要求不高,易于实现。

Accurate linear viscoelastic constitutive parameters are foundation of propellant grain structural integrity analysis. Based on genetic algorithm, uniaxial relaxation modulus and bulk relaxation modulus acquisition methods were presented. The uniaxial relaxation modulus of HTPB propellant was obtained by experiment. Compared with traditional method, it is indicated that the relaxation modulus determined by genetic algorithm method is more accurate, and the presented method overcomes shortage of being inaccurate in traditional approach. The applicability of linear viscoelastic constitutive model for HTPB propellant was discussed, and the application range was determined. The proposed bulk relaxation modulus measurement method has no significant equipment requirement, and is easy to implement.