HTPB推进剂非线性粘弹特性的时温等效研究 *

Time-Temperature Equivalent Researchof Nonlinear Viscoelastic Propertiesof HTPBP ropellant

关键词:  HTPB推进剂  非线性  粘弹特性  时温等效效应  蠕变

Key words:  HTPB propellant  Nonlinear  Viscoelastic property  Time-temperature equivalent effect  

摘要:

为研究 HTPB推进剂非线性粘弹特性的时温等效效应，推导了基于 Schapery单积分非线性本构方程的 HTPB推进剂时温等效理论表达式，给出了蠕变柔量主曲线的拟合方法。通过不同应力(0.1MPa，0.2MPa，0.3MPa)和不同温度( 20℃，40℃，60℃，80℃)条件下 HTPB推进剂蠕变试验，得到了参考温度( 20℃)下的蠕变柔量主曲线。通过反复加载蠕变试验，分析了载荷变化对蠕变过程的影响。结果表明:不同温度下的蠕变柔量 -时间对数曲线在稳定蠕变阶段具有良好的一致性，验证了 HTPB推进剂非线性粘弹特性的时温等效效应； 0.1MPa，0.2MPa和 0.3MPa应力下的蠕变柔量主曲线时间尺度从试验测试的 103s分别延伸到了 104.27 s，104.17 s和 103.91 s；快速的应力释放和恢复加载过程不会影响整个蠕变过程，载荷变化蠕变过程的时温等效效应具有连续性。

Abstract:

In order to study the time-temperature equivalent effect of HTPB propellant among the viscoelas. tic process，the time-temperature equivalent mathematical expressions based on single-integral nonlinear consti. tutive equation of Schapery was deduced，and the creep compliance master curve fitting method was given. The creep experiments under different stress(0.1MPa，0.2MPa，0.3MPa)and temperature(20℃，40℃，60℃，80℃) levels were conducted to obtain the creep compliance-time logarithmic curve and the creep compliance mastercurve when the reference temperature was 20℃. The repeated loading creep experiments were conducted to ana.lyze the load change on the influence of creep process. The results show that there is a good consistency on themaster curves under the different temperature levels. The main curve time scales in the 0.1MPa，0.2MPa and 0.3MPa stress conditions extends from the test time 103s to 104.27 s，104.17 s and 103.91 s. High-speed stress release