钝感双基发射药迁移失效评价方法

发射药传统老化失效评价主要针对发射药贮存过程中的化学安定性，未考虑物理变化层面的钝感剂迁移现象。基于扩散原理以及钝感剂分布与燃烧性能的关联，建立由密闭爆发器实验测试钝感双基发射药动态活度最大值升高百分比的迁移失效评价方法。通过密闭爆发器和弹道实验，获得了钝感双基发射药动态活度最大值升高幅度随老化时间的线性增长模型，并验证了所提方法的有效性。通过气相色谱实验分析发射药中安定剂含量随老化时间的变化规律，揭示了钝感双基发射药老化迁移导致的失效时间早于化学安定性失效时间。钝感双基发射药老化失效评价应遵循“双阈值原则”，从而保证其贮存安全性和使用安全性。

Evaluation Method for Migration Invalidation of Deterred Double-base Gun Propellants

The traditional aging invalidation evaluation of gun propellants is mainly for the chemical stability of propellants during storage without considering the migration of deterrent in the aspect of physical change. Based on the diffusion principle and the relationship between the deterrent distribution and the combustion performance, a migration invalidation evaluation method is established for testing the percentage increase in the maximum dynamic vivacity of deterred double-base gun propellants by closed vessel experiment. Through the closed vessel and ballistic experiment, the linear growth model of the increasing percentage of the maximum dynamic vivacity of deterred double-base gun propellants with the aging time was obtained, and the validity of the established method was verified. The variation of the stabilizer content with aging time is analyzed by gas chromatography. It is revealed that the invalidation time of deterred double-base gun propellants caused by the aging migration is earlier than that of the chemical stability. The aging invalidation evaluation of the deterred double-base gun propellants should follow the “double threshold principle” to ensure their storage safety and use safety.