基于微观结构分析的CMDB推进剂动态断裂韧性加载率敏感性研究  

Effects of Loading Rate and Microstructure on Dynamic Fracture Toughness of CMDB Propellant

作　　者：郑健[1] 汪文强[1,2] 陈雄[1] 许进升[1] 周长省[1] 

机构地区：[1]南京理工大学机械工程学院,江苏南京210094 [2]武汉滨湖电子有限责任公司,湖北武汉430077

出　　处：《推进技术》2015年第6期940-946,共7页Journal of Propulsion Technology

基　　金：总装重点预研项目(20101019)

摘　　要：为研究改性双基推进剂（CMDB）的动态断裂特性,利用霍普金森实验技术（SHPB）对CMDB推进剂进行了冲击实验,并对实验数据的可靠性进行了校验;通过数值仿真的方法进一步验证了实验数据的有效性,获得了CMDB推进剂的动态断裂韧性;利用电镜扫描技术对试件断面进行了微观表征和分析。结果表明：CMDB推进剂在加载率58906-100056MPa·m1/2·s^-1范围内,表现出明显的加载率敏感性;加载率达到105000 MPa·m^1/2·s^-1左右时,断裂韧性不再继续增大,反而出现下降趋势;电镜分析结果表明,CMDB推进剂加载率敏感性与其内部高氯酸铵（AP）颗粒的微观破坏机理直接相关。In order to investigate the dynamic fracture characteristics of the composite modified double-base propellant （CMDB） under impact loading, impact fracture experiments were performed on the split Hopkinson pressure bar （SHPB） device, and the reliability of the experimental data was verified. Moreover, a numerical analysis was conducted to verify the experimental data, and the dynamic fracture toughness of CMDB propellant was obtained. The fractured CMDB specimens were investigated by using Scanning Electron Microscope （SEM）. It is found that the CMDB propellant is a significant loading rate sensitivity material within the range of normalized loading rates from 58906MPa·m1/2·s^-1 to 100056MPa·m1/2·s^-1. However, as the loading rate increase to 105000 MPa·m1/2·s^-1, the dynamic fracture toughness of CMDB propellant does not continue to increase, but decrease. SEM analysis shows that the loading rate sensitivity of CMDB propellant is directly related to the microstructure failure mechanism of ammonium perchlorate （AP） particles.

关 键 词：改性双基推进剂 霍普金森实验 加载率敏感性 电镜扫描 

分 类 号：V435[航空宇航科学与技术—航空宇航推进理论与工程]