准静态拉伸下固体推进剂三维结构变形损伤失效机理研究  

Research on three-dimensional structural deformation failuremechanism of solid propellant under quasi-static tension

作　　者：魏晋芳 赖国栋 柴海伟 谢红兰[3] 王宁 桑丽鹏[4,5] 张峰涛 WEI Jinfang;LAI Guodong;CHAI Haiwei;XIE Honglan;WANG Ning;SANG Lipeng;ZHANG Fengtao(School of Physical Science and Technology,Southwest Jiaotong University,Chengdu 610031,China;Key Laboratory of Advanced Technologies of Materials,Ministry of Education,School of Materials Scienceand Engineering,Southwest Jiaotong University,Chengdu 610031,China;Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 100864,China;Science and Technology on Aerospace Chemical Power Laboratory,Xiangyang 441003,China;Hubei Institute of Aerospace Chemotechnology,Xiangyang 441003,China)

机构地区：[1]西南交通大学物理科学与技术学院,成都630031 [2]西南交通大学材料科学与工程学院教育部先进材料与技术重点实验室,成都630031 [3]中国科学院上海应用物理研究所,上海100864 [4]航天化学动力重点实验室,襄阳441003 [5]湖北航天化学技术研究所,襄阳441003

出　　处：《固体火箭技术》2023年第2期186-194,共9页Journal of Solid Rocket Technology

摘　　要：为揭示固体推进剂在准静态拉伸下变形损伤过程,依靠微型材料试验机在上海同步辐射光源BL13W1线站搭建了原位显微CT测试系统,对HTPB推进剂试样在准静态拉伸下变形损伤过程进行了三维原位实时表征,像素尺寸3.74μm。基于上述试验结果,分析了目标微细观结构演化过程及孔隙率与材料宏观损伤之间的关系。结果表明,固体推进剂内部微裂纹的出现早于应力-应变曲线达到拉伸极限强度点。利用图像分割技术精确提取了AP颗粒、Al粉颗粒、微裂纹与HTPB基体相,并对AP颗粒与Al粉颗粒的三维拓扑结构进行了定量描述。微裂纹的成核集中在较大且形貌不规则的AP颗粒与HTPB基体界面。最后,观察到裂纹在固体推进剂内部的水平传播和竖直合并两种传播模式,并以水平传播为主导。In order to reveal the deformation and damage process of solid propellant under quasi-static tension,an in-situ micro-CT test system was set up at the BL13W1 line station of Shanghai Synchrotron Radiation Source Facility by using a micro-material testing machine.The deformation and damage process of HTPB propellant samples under quasi-static tension was three-dimensional in-situ real-time characterized and the pixel size was 3.74μm.Based on the above test results,the evolution process of target microstructure as well as the relationship between the porosity and the macroscopic damage of material was analyzed.The result shows that internal micro-cracks of the solid propellant appear earlier than ultimate tensile strength point of the stress-strain curve.AP particles,aluminum powder particles,micro-cracks and HTPB matrix phase were accurately extracted by image segmentation technology,and the three-dimensional topological structure of AP particles and aluminum powder particles was quantitatively described.The nucleation of micro-cracks was concentrated at the interface between larger and irregular AP particles and HTPB matrix.Finally,horizontal and vertical merging propagation modes of cracks in solid propellant were observed,and the horizontal propagation was dominant for formation of deformation concentration zones.

关 键 词：固体推进剂 原位显微CT 三维数字图像分析技术 变形损伤失效机制 

分 类 号：V512[航空宇航科学与技术—航空宇航推进理论与工程]