HTPB 推进剂的热机械耦合加速老化分析

Yi Zeng, Wei Huang, Jia‐Xing Chen, Jin-sheng Xu, Xiong Chen, Rui Wu, Qi‐Xuan Song
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摘要

本研究采用低应变率和中应变率的宏观单轴压缩试验,结合微观电子显微镜,广泛分析了热机械耦合老化对羟基封端聚丁二烯(HTPB)推进剂加速老化的影响,并与热量和动态往复力等孤立因素的影响进行了对比。结果表明,在不同的环境温度下(323 K、343 K 和 363 K),热机械耦合老化对 HTPB 推进剂的影响比孤立因素的影响更为显著。从宏观上看,这种影响表现为老化过程中更容易变形、永久变形、耗散能量持续增加以及老化后平均应力和极限应变降低。从微观上看,这种效应主要源于基体热降解和颗粒破碎之间的相互作用,它们迅速累积并对材料的宏观机械性能产生重大影响。此外,随着老化温度的升高,HTPB 推进剂的宏观机械性能和微观形态的变化会变得更加明显。然而,过高的温度可能会迅速导致材料性能大幅下降。因此,虽然提高温度可以有效加速热机械老化,但必须审慎考虑其对材料性能的潜在不利影响。这强调了在 HTPB 推进剂中平衡温度调节和提高老化效率的必要性,以确保有效控制和定量评估老化过程,同时最大限度地减少材料降解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Analysis of thermomechanical coupled accelerated aging of HTPB propellants
This study employed macroscopic uniaxial compression tests at low and medium strain rates, coupled with microscopic electron microscopy, to extensively analyse the impact of thermomechanical coupled aging on the accelerated aging of Hydroxyl‐terminated Polybutadiene (HTPB) propellants, contrasting it with the effects of isolated factors such as heat and dynamic reciprocating force. Results indicate that at various environmental temperatures (323 K, 343 K, and 363 K), thermomechanical coupled aging more significantly affects HTPB propellants than isolated factors. This effect is macroscopically evident in increased ease of deformation, permanent deformation during aging, continual increase in dissipated energy, and a decrease in average stress and ultimate strain post‐aging. Microscopically, the effect predominantly arises from the interplay between matrix thermal degradation and particle fragmentation, which rapidly accumulate and substantially impact the material's macroscopic mechanical properties. Furthermore, as the aging temperature rises, the alterations in both macroscopic mechanical properties and microscopic morphology of HTPB propellants become more pronounced. However, overly high temperatures may swiftly result in substantial material performance deterioration. Consequently, while elevating temperature effectively accelerates thermomechanical aging, the potential adverse effects on material performance must be judiciously considered. This underscores the necessity of balancing temperature regulation with aging efficiency enhancement in HTPB propellants to ensure effective control and quantitative assessment of the aging process, while minimizing material degradation.
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