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含能材料  2015 

结构试验器固体推进剂装药低温加速老化试验研究

DOI: 10.11943/j.issn.1006-9941.2015.07.008

Keywords: 推进剂 老化 应变 损伤 力学性能

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Abstract:

采用低温加速老化试验的方法, 依据GJB770B-2005火药试验方法, 测试了6%、9%、12%和15%四种不同应变水平的结构试验器在单轴拉伸条件下的最大拉伸强度σm和最大伸长率εm, 考察了四种结构试验器中装药推进剂在低温(-28 ℃)下贮存性能随老化时间的变化趋势。结果表明:在低温应力应变情况下结构试验器中推进剂老化的主要原因是应力损伤。动态力学分析(DMA)试验(频率1 Hz, 振幅20 μm, 测试温度范围-100~80 ℃, 升温速率为3℃·min-1)证实推进剂确已发生损伤。常温拉伸(拉伸速度100 mm·min-1, 测试温度(23±2) ℃)情况下, 推进剂σm逐渐升高, 15%应变的结构试验器经过19周低温老化后, σm(0.96 MPa)与初始值(0.74 MPa)相比增加了近30%, εm基本在初始值附近波动; 低温快速拉伸(拉伸速度500 mm·min-1, 测试温度(-55±2) ℃情况下老化后期推进剂σm升高, εm明显下降, 15%应变的结构试验器经过19周低温老化后, σm(4.18 MPa)与初始值(3.77 MPa)相比增加了约11%, εm(26.8%)与初始值(37.6%)相比降低近29%。根据试验现象初步分析推进剂在低温应力情况下的老化机理可能是应力/应变作用下的物理损伤, 包括网络内聚损伤和固体颗粒与粘合剂界面“脱湿”

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