摘要
本文以HTPB推进剂为研究对象,开展了100%/s,50%/s,12%/s三种初始拉伸应变率下的固体推进剂松弛模量试验,得到了三种状态下的松弛模量曲线;并以初始拉伸曲线拟合的模量为依据对松弛模量Prony级数进行了修正,获得了固体推进剂的瞬时模量,在此基础上开展了发动机低温点火建压条件下的结构完整性计算。结果表明:提高松弛试验的初始应变速率获得的固体推进剂松弛模量更符合松弛模量的定义,更能表征固体推进剂短时间内的松弛过程;在低温点火建压结构完整性计算时,温度应变受固体推进剂瞬时模量影响较小,松弛模量在短时间内的快速变化和升压速率会影响装药在快速建压过程的主应变计算结果。
Hydroxyl-terminated polybutadiene(HTPB)propellant is investigated in this study.At three initial tensile strain rates of 100%/s,50%/s and 12%/s,the propellant relaxation modulus tests are carried out,and the relaxation modulus curves of the propellant are obtained.Prony series for relaxation modulus is revised based on the modulus which are fitted with initial tensile curves,and the instantaneous modulus of the propellant under three conditions are obtained.The analysis of the structural integrity of the charge during low-temperature ignition and pressure build-up is conducted based on the revised Prony series.The results indicate that it is much more appropriate for the definition of relaxation modulus by increasing the initial tensile strain rate,which is also more likely to represents the instantaneous relaxation process.When calculating structural integrity under low temperature ignition,temperature strain is less affected by the instantaneous modulus of the propellant,and the principal strain calculating results can be significantly influenced by the rapidly changing of relaxation modulus and pressure rise rate in a short time during the rapid pressure build-up process.
作者
王一博
唐奇
董蒙
蒋鹏琛
Wang Yibo;Tang Qi;Dong Meng;Jiang Pengchen(China Airborne Missile Academy,Luoyang 471009,China;Unit 93160 of PLA,Beijing 100076,China)
出处
《航空兵器》
北大核心
2025年第4期135-140,共6页
Aero Weaponry
关键词
固体推进剂
瞬时模量
松弛模量试验
装药结构完整性
粘弹性
solid propellant
instantaneous modulus
relaxation modulus test
structural integrity of the charge
viscoelastictity
