Abstract: The hygrothermal accelerated aging experiments for adhesive interface specimens of solid rocket motor were carried out, and the tearing strength at different aging time was measured. The phenomena in the hygrothermal accelerated aging experiments and tearing strength measurment were described and explained, also including the rule of variation of the tearing strength with aging time by contrasting to the absorption law of composite. The results show that the lining-propellant interfaces are the weakest interfaces. Hygrothermal aging can promote the diffusion and permeability of water from lining-propellant interface to propellant internal and lead the tearing strength loss. The average tearing strength of adhesion interface varies downward with aging time, and there is a period in which the strength varies stably.

Key words: Adhesive interface; Hygrothermal aging; Tearing strength

摘要： 对固体火箭发动机粘接界面试验件进行了不同湿热条件下的加速老化试验,并测量了不同老化时间粘接界面的扯离强度,描述了湿热老化试验和性能测试中的试验现象,结合复合材料微粘接结构吸湿规律对试验现象和撤离强度随老化时间变化曲线进行了分析。研究结果表明:衬层-推进剂粘接界面是固体火箭发动机粘接结构中最薄弱环节,应予以重点考虑；湿热老化促进了环境水分从衬层–推进剂界面向推进剂内部的扩散和渗透,致使弱边界层向推进剂内部扩展,导致了衬层-推进剂界面粘接强度的降低。试验件平均扯离强度随老化时间呈下降趋势,中间有一个强度趋于稳定的平台期。 

关键词: 粘接界面;湿热老化;扯离强度 