PBT固体推进剂低温力学性能研究

Low Temperature Mechanical Properties of PBT Solid Propellant

关键词:  PBT固体推进剂  低温  力学性能  单轴拉伸  线性拟合

Key words:  PBT propellant  Low temperature  Mechanical properties  Uniaxial tension  Linear fit

摘要:

为考察PBT固体推进剂低温力学性能，采用单轴拉伸实验方法研究了固化参数、交联参数、固化时间三种因素对PBT固体推进剂-40℃下力学性能的影响。玻璃化温度测试结果表明，全部样品玻璃化温度处于-51.3～-53.6℃，推进剂在-40℃下处于高弹态；单轴拉伸测试结果表明：PBT固体推进剂在低温状态下硬度、抗拉强度与固化参数、交联参数、固化时间呈正相关，伸长率与固化参数、交联参数、固化时间呈负相关。低温力学性能受固化参数、交联参数影响显著性低于常温力学性能；低温下固化参数在1.00～1.05内与伸长率呈现一定线性关系。

Abstract:

In order to investigate the mechanical properties of PBT propellant at low temperature， the uniaxial tensile test method was used to study the effects of curing parameters， crosslinking parameters， and curing time on the mechanical properties of PBT propellant at -40°C.The glass transition temperature of all samples is between -51.3~-53.6℃，indicating that propellant is in rubbery state at -40℃.The results of mechanical properties data show that hardness and tensile strength are positively correlated with curing parameter， crosslinking parameter and curing time， and the elongation is negatively correlated with curing parameters， crosslinking parameters and curing time. Effects of curing parameter， crosslinking parameter on mechanical properties at -40℃are less significant than those at 20℃. Elongation presents a good linear relationship when curing parameter is between 1.00~1.05.