HTPB推进剂交变温度加速老化与自然贮存相关性

摘要

Alternating temperature accelerated aging test was designed to ensure that accelerated aging could preferably simulate real world storage of HTPB propellant. Aging test was designed in the temperature range from -10 ℃ to 60 ℃ at three different rate of change(10 ℃/12 h,20 ℃/12 h,30 ℃/12 h). Mechanical properties of HTPB propellant aged for three different periods were measured and analyzed. The correlation between accelerated aging and real world storage was analyzed in terms of elongation.Results show that the tensile strength increased and the elongation decreased after accelerated aging,showing the same trend of real world storage. The mechanical properties of HTPB propellant is strongly influenced by the rate of temperature change,and alternating temperature accelerated aging test is consistent well with real world storage.%为研究与自然贮存环境相关性较好的推进剂加速老化方法,设计了 HTPB复合推进剂交变温度加速老化试验,在-10～60℃温度范围内,以3种温度变化速率(10 ℃/12 h,20 ℃/12 h,30 ℃/12 h),分别老化3S d,56 d,91 d后对推进剂进行力学性能测试,基于最大伸长率进行了HTPB推进剂加速老化与自然贮存的相关性分析.结果表明,加速老化过程中推进剂抗拉强度变大、伸长率下降,与自然老化趋势一致;温度变化速率在推进剂老化过程中对力学性能变化有较大影响;交变温度加速老化1 d分别相当于自然贮存9.2 d,13.3 d,19.7 d,交变温度加速老化与自然贮存具有较好的相关性.