Solid propellant is the main part of solid rocket motor (SRM). To further investigate the service life of SRM, aging of solid propellant should be concerned. The aim of this study is to propose a new aging constitutive model of solid propellant using the degree of crosslinking. The aging development equation of viscoelastic Poisson’s ratio (VPR) and relaxation modulus are considered in establishing the model. A series accelerated aging experiments accompanied with some tensile tests are designed to verify the new model. Aging experiments show that degree of crosslinking (DCL) can be used to act as a link to facilitate the communication between chemical aging and aged mechanical parameters well.

中文翻译：

---

基于交联度的固体推进剂老化模型研究

固体推进剂是固体火箭发动机（SRM）的主要部件。为了进一步调查SRM的使用寿命，应该关注固体推进剂的老化。本研究的目的是利用交联度提出一种新的固体推进剂老化本构模型。建立模型时考虑了粘弹性泊松比(VPR)和松弛模量的老化发展方程。设计了一系列加速老化实验和一些拉伸试验来验证新模型。老化实验表明，交联度（DCL）可以作为一个纽带，很好地促进化学老化和老化机械参数之间的沟通。