| HTPB推进剂的低温疲劳特性 |
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| 引用本文： | 童心,王永平,许进升,职世君,陈雄,郑亚.HTPB推进剂的低温疲劳特性[J].航空动力学报,2017,32(5):1234-1240. |
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| 作者姓名： | 童心 王永平 许进升 职世君 陈雄 郑亚 |
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| 作者单位： | 1.南京理工大学 机械工程学院，南京 210094 |
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| 基金项目： | 国家自然科学基金（U1404106）;江苏省自然科学基金（BK20140772）；中央高校基本科研业务费专项资金（30915011301） |
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| 摘 要： | 为探究端羟基聚丁二烯（HTPB）推进剂在低温下的疲劳特性，结合空空导弹在使用中的实际情况设计了包含不同应变幅值和加载频率的高周疲劳实验.实验在动态热机械分析仪上进行，温度保持为-50℃，加载频率设定为50,100,150Hz.为了考察低温下HTPB推进剂微小预变形对疲劳特性的影响，在动力循环加载前进行了准静态加载.疲劳实验后对试件实施单轴恒速拉伸，以获取疲劳后推进剂的力学参数.结果表明:在其他条件不变的情况下，疲劳应变幅值和加载频率越大，材料力学性能劣化程度越大，所累积的疲劳损伤量越大.初始阶段的准静态加载对推进剂疲劳特性起消极影响，低温高频下推进剂的疲劳损伤演化呈现出非线性，随着疲劳次数的增加，疲劳损伤增速由快变缓.
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| 关 键 词： | HTPB推进剂 低温 高频率 疲劳特性 损伤 |
| 收稿时间： | 2016/6/3 0:00:00 |
Fatigue properties of HTPB propellant at low temperature |
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| TONG Xin,WANG Yong-ping,XU Jin-sheng,ZHI Shi-jun,CHEN Xiong,ZHENG Ya.Fatigue properties of HTPB propellant at low temperature[J].Journal of Aerospace Power,2017,32(5):1234-1240. |
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| Authors: | TONG Xin WANG Yong-ping XU Jin-sheng ZHI Shi-jun CHEN Xiong ZHENG Ya |
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| Abstract: | To obtain the fatigue properties of hydroxyl-terminated polybutadiene (HTPB) propellant at low temperature,high-cycle fatigue tests including variable strain amplitudes and frequencies were conducted by taking practical application of tactics missile into account.Test equipment was a dynamic mechanical analyzer and temperature was kept constant at-50 ℃,frequencies at 50,100,150 Hz.Before cyclic loading,quasi-static loading was carried out to investigate the effect of small pre-strain on fatigue properties of HTPB propellant at low temperature.Also,axial tensile tests at constant strain rates were made to acquire mechanical parameters after fatigue tests.The results indicate that with the increasing strain amplitude and loading frequencies,the mechanical properties degradation degree and fatigue damage increase.Initial quasi-static loading has a negative effect on fatigue properties and fatigue damage evolution demonstrates the non-linear characteristics,while fatigue damage accumulation slows down along with the cyclic numbers. |
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| Keywords: | HTPB propellant low temperature high frequency fatigue properties damage |
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