| 引用本文: | 张亮,申志彬,虞跨海.围压下固体推进剂的破坏机理分析.[J].国防科技大学学报,2022,44(6):6-13.[点击复制] |
| ZHANG Liang,SHEN Zhibin,YU Kuahai.Analysis on the failure mechanism of solid propellant under superimposed pressure[J].Journal of National University of Defense Technology,2022,44(6):6-13[点击复制] |
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| 围压下固体推进剂的破坏机理分析 |
| 张亮1,申志彬2,虞跨海1 |
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(1. 河南科技大学 土木工程学院, 河南 洛阳 471023;2. 国防科技大学 空天科学学院, 湖南 长沙 410073)
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| 摘要: |
| 贴壁浇筑的固体发动机推进剂药柱在点火状态下处于三向围压状态,而环向承受拉应变,亟待对围压下推进剂的破坏机理展开研究。基于自研的围压加载试验系统,通过开展推进剂在不同围压、温度和应变率下的单轴拉伸试验来研究围压、温度和应变率的耦合作用对推进剂力学行为的影响。针对围压下推进剂的力学响应特征,通过细观力学仿真进一步研究围压下推进剂的破坏形式,同时借助电镜扫描试验分析推进剂试样断面的形貌特征,通过试验和仿真相结合的手段分析了围压下推进剂的破坏机理。研究结果表明,围压下推进剂的损伤界面显著减少,且随着围压载荷的逐渐增加,推进剂的损伤形式从以颗粒脱湿为主转变为以颗粒破碎为主。 |
| 关键词: 固体推进剂 围压 细观模型 电镜扫描 破坏机理 |
| DOI：10.11887/j.cn.202206002 |
| 投稿日期：2021-06-22 |
| 基金项目:国家自然科学基金资助项目(11872372,11902348,11902350)；国防科技基础加强计划资助项目(2019JCQZD178)；河南省科技攻关资助项目(222102210298)；河南省教育厅自然科学研究资助项目(22A130001) |
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| Analysis on the failure mechanism of solid propellant under superimposed pressure |
| ZHANG Liang1, SHEN Zhibin2, YU Kuahai1 |
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(1. School of Civil Engineering, Henan University of Science and Technology, Luoyang 471023, China;2. College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China)
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| Abstract: |
| In the ignition state, the SRM (solid rocket motor) grain with wall pouring is in the state of superimposed pressure, while the circumferential direction of SRM inner bore is under tensile strain. It is urgent to carry out related research on the failure mechanism of propellant under superimposed pressure. The mechanical behavior of solid propellant under coupling effect of superimposed pressure, temperature and strain rate was investigated through uniaxial tensile tests at different pressure, temperature and strain rates using self-developed superimposed pressure loading system. According to the mechanical response characteristics of the propellant under superimposed pressure, the failure modes of the propellant under superimposed pressure were further studied by means of meso-scale mechanical simulation. At the same time, the morphologic sectional features of the propellant specimens were analyzed by means of scanning electron microscope test. The failure mechanism of the propellant under superimposed pressure was found out by means of combining test and simulation. The results show that the damage interfaces of propellant decrease significantly under superimposed pressure, and with the increasing of superimposed pressure, the damage form of propellant changes from particle dewetting dominated to particle breakage dominated. |
| Keywords: solid propellant superimposed pressure meso-scale model scanning electron microscope failure mechanism |
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