HTPB推进剂热力耦合加速老化细观损伤机理分析  

Analysis of Mesoscopic Damage Mechanism of HTPB Propellant under Thermo⁃Mechanical Coupled Accelerated Aging

作　　者：曾毅 黄薇[1] 陈家兴 许进升[1] 陈雄[1] 武锐 ZENG Yi;HUANG Wei;CHEN Jia-xing;XU Jin-sheng;CHEN Xiong;WU Rui(School of Mechanical Engineering,Key Laboratory of Special Engine Technology,Ministry of Education,Nanjing University of Science and Technology,Nanjing 210094,China;The 41st Institute of the Sixth Academy of China Aerospace Science and Industry Corporation,Hohhot 010000,China)

机构地区：[1]南京理工大学机械工程学院,特种动力技术教育部重点实验室,江苏南京210094 [2]中国航天科工集团第六研究院四十一所,内蒙古呼和浩特010000

出　　处：《含能材料》2024年第2期162-174,共13页Chinese Journal of Energetic Materials

基　　金：国家自然科学基金(52105107);机械系统与振动国家重点实验室开放课题(MSV202220)。

摘　　要：为了深入探究端羟基聚丁二烯(HTPB)推进剂在热力耦合作用下的细观损伤机理,采用了试验表征和理论分析相结合的方法。具体而言,对在不同环境温度(50,70℃和90℃)及不同加载次数下的HTPB推进剂进行了细观层面分析。在50℃下,分别进行了约3000次和10800次加载;在70℃下,分别进行了约1800,3600次和7030次加载;而在90℃下,则进行了约1800次加载。研究发现:在热力耦合加速老化作用下,HTPB推进剂的细观损伤比单一因素老化更为显著。其细观损伤机理主要涉及两方面:一是由于基体热降解,基体自身的承载性能及其与颗粒间的粘接强度均有所下降,进而导致颗粒“脱湿”;二是颗粒的“脱湿”现象反过来进一步加剧了基体的热降解。这种相互作用使得细观损伤更加严重。研究还发现,随着老化温度的增加,细观损伤的程度会加剧,但温度过高将改变老化过程的细观损伤机理。此外,研究指出,在其他条件不变的前提下,合理选择终止加载次数对于判断HTPB推进剂是否发生显著细观损伤至关重要。本研究中,当50℃和70℃下的加载次数比(N/N_(End))分别超过0.281和0.330时,HTPB推进剂会产生显著的细观损伤。This research investigates the mesoscopic damage mechanisms in hydroxyl⁃terminated polybutadiene(HTPB)propel⁃lants under thermal⁃mechanical coupling.Experimental characterization and theoretical analysis were employed to analyze these mechanisms at different environmental temperatures(50,70,and 90℃)and loading cycles.At 50℃,the propellants under⁃went approximately 3000 and 10800 loading cycles;at 70℃,1800,3600,and 7030 cycles;and at 90℃,around 1800 cy⁃cles.The findings indicate that the mesoscopic damage in HTPB propellants,exacerbated by thermomechanical coupling,is more pronounced than that caused by a single aging factor.This damage primarily results from two processes:thermal degrada⁃tion of the matrix,diminishing both its load⁃bearing capacity and adhesion to particles,leading to particle dewetting;and the subsequent exacerbation of the matrix′s thermal degradation by this dewetting.The above interaction makes the mesoscopic damage more severe.Moreover,the damage intensifies with increasing aging temperature,but extremely high temperatures modify the mesoscopic damage mechanism.Furthermore,the study emphasizes the importance of selecting an appropriate num⁃ber of loading cycles to assess significant mesoscopic damage in HTPB propellants.Notably,substantial damage occurs when the loading cycle ratio(N/N_(End))at 50℃and 70℃exceeds 0.281 and 0.330,respectively.

关 键 词：HTPB推进剂 热力耦合加速老化 细观形貌 细观损伤机理 

分 类 号：TJ5[兵器科学与技术—军事化学与烟火技术] TJ71[理学—固体力学] O34[理学—力学]