PBT基复合固体推进剂高温蠕变行为研究  

Creep behavior of composite solid propellant based on PBT at high temperature

作　　者：胡义文 左海丽[2] 郑启龙 屠仁举 张惠坤 周伟良[1] 

机构地区：[1]南京理工大学,南京210094 [2]中国航天科技集团公司八院806所,湖州313002

出　　处：《固体火箭技术》2018年第1期41-46,共6页Journal of Solid Rocket Technology

基　　金：国家973重点基础研究规划项目资助(613275)

摘　　要：针对叠氮类推进剂高温软化问题,通过蠕变试验研究了某3,3-二叠氮甲基氧丁环与四氢呋喃共聚醚(PBT)基复合固体推进剂高温力学性能。结果表明,叠氮聚醚推进剂高温蠕变性能与应力、温度强烈相关,尤其是载荷效应明显。T-1、T-2和T-3试样在50℃、0.1 MPa条件下蠕变应变值分别为7.01%、7.98%和21.77%,增塑比较大的试样高温软化现象明显。高温蠕变形变中,主要是高弹形变,其所占比重明显大于普弹形变和永久形变总和。运用时温等效原理对叠氮聚醚推进剂长期蠕变性能预测过程中,T-1、T-2和T-4试样的蠕变柔量主曲线时间范围扩展至3.4×10~8、1.9×10~8、9.1×10~7s。在考察的时间尺度范围内,试样的蠕变柔量变化相对较小,并未明显表现出蠕变破坏阶段。In order to solve the high-temperature softening problem of azido-based propellants, the high-temperature mechanical behavior of composite solid propellants based on PBT were investigated by means of creep test. The results reveal that creep behavior of propellant sample is greatly dependent on the temperature and stress, especially displays obvious loading effect. Under the condition 50℃ and 0.1 MPa, the creep strain of T-1, T-2, and T-3 samples are 7.01%, 7.98%, 21.77%, respectively. Among the fitted parameters, it can be mentioned that the proportion of high elastic deformation is obviously larger than those of instantaneous deformation and viscous flow deformation. It indicates the elastic performance of solid propellant has great influence on their high-tem- perature mechanical properties. Moreover, according to the creep master curves based on time-temperature equivalence principle, the predication time of T-l, T-2 and T-3 can expand to 3.4×10^8 s, 1.9×10^8 s, and 9.1×10^7 s, respectively. The creep curves of composite solid propellants based on PBT do not show accelerated creep failure stage, which was confirmed by the modest increase of creep compliance in the prediction range.

关 键 词：PBT复合固体推进剂 高温蠕变 时温等效原理 

分 类 号：V512[航空宇航科学与技术—航空宇航推进理论与工程]