| 基体特性对HTPB推进剂力学性能的影响 |
| |
| 引用本文： | 韩龙,许进升,周长省. 基体特性对HTPB推进剂力学性能的影响[J]. 航空动力学报, 2017, 32(10): 2553-2560. DOI: 10.13224/j.cnki.jasp.2017.10.030 |
| |
| 作者姓名： | 韩龙 许进升 周长省 |
| |
| 作者单位： | 南京理工大学 机械工程学院，南京 210094 |
| |
| 基金项目： | 江苏省自然科学青年基金（BK20140772）； 中央高校基本科研业务费专项资金（30915011301） |
| |
| 摘 要： | 按工程生产工艺要求，制得hydroxyl terminated polybutadiene (HTPB)固化胶片，通过控制试验环境温度（-50、-35、-20、0、20、35℃），得到了基于Prony级数形式的具有不同松弛特性的复合基体材料的松弛行为描述，为细观模型的建立提供了必要参数。随后基于分子动力学方法，结合具有内聚本构的黏接单元，建立了推进剂的细观计算模型。为验证所建数值模型的准确性，对固体推进剂在常温条件下进行宏观松弛力学试验，将仿真结果与试验数值的对比，试验结果与仿真结果相差在20%范围之内。最后对具有不同随机分布及不同基体松弛特性的推进剂细观模型进行有限元计算，结果表明:颗粒随机性不影响推进剂的宏观力学行为，而基体松弛特性显著影响固体推进剂的宏观力学性能，基体松弛特性获取环境温度与推进剂的宏观初始模量、延伸率以及强度均呈指数型关系。
|
| 关 键 词： | 复合固体推进剂 黏弹性 细观模型 分子动力学方法 黏接单元 松弛特性 |
| 收稿时间： | 2016-02-28 |
Effect of matrix material properties on the mechanical behavior of HTPB composite propellant |
| |
| HAN Long,XU Jinsheng,ZHOU Changsheng. Effect of matrix material properties on the mechanical behavior of HTPB composite propellant[J]. Journal of Aerospace Power, 2017, 32(10): 2553-2560. DOI: 10.13224/j.cnki.jasp.2017.10.030 |
| |
| Authors: | HAN Long XU Jinsheng ZHOU Changsheng |
| |
| Abstract: | The matrix material of hydroxyl-terminated polybutadiene (HTPB) composite propellant was manufactured according to the requirement of production process.To obtain the matrix material with different relaxation characteristics,the relaxation tests of material specimens were conducted under different temperatures (-50,-35,-20,0,20,35 ℃),and the test results were fitted by Prony series.The experimental results provided necessary parameters for the follow-up simulation calculation.Then the meso-scale model of the composite propellant was generated by combining molecular dynamics method with cohesive element.To verify the applicability of the random packing numerical model,the relaxation tests of HTPB propellant were conducted under room temperature.The simulation results agreed well with the real relaxation tests and the error between the two curves was less than 20％.This shows that the developed meso-scale numerical model is capable of reflecting the mechanical behavior of HTPB propellant.Finally,the numerical simulation of HTPB propellant with different random spatial distributions and matrix material properties was conducted on the Abaqus program.The results show that the random distribution of particles does not affect the macroscopic mechanical properties of HTPB propellant.However,the matrix properties have a significant impact on macroscopic mechanical behavior of HTPB propellant,and the relationship between macroscopic mechanical parameters (initial modules,elongation and strength) and the environment temperatures of binder follows the rule of exponential equation. |
| |
| Keywords: | composite propellant viscoelastic mesomechanicas model molecular dynamics method cohesive element relaxation characteristic |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《航空动力学报》浏览原始摘要信息 |
|
点击此处可从《航空动力学报》下载全文 |
