摘要
含有裂纹缺陷的固体推进剂在服役周期内受到冲击波载荷影响易引发裂纹扩展,严重影响固体推进剂的结构完整性。为探究端羟基聚丁二烯推进剂在不同冲击波强度下的动态力学响应和缺陷损伤演化行为,采用激波管装置,结合纹影成像和3D-DIC技术,在0.3~0.9 MPa的压力范围内,对无裂纹缺陷推进剂试样及含十字裂纹缺陷推进剂试样进行了冲击波加载实验,捕捉了推进剂的动态变形及损伤演化过程。结果表明,无裂纹缺陷试样变形呈抛物线形状,试样变形随冲击压力增大而增大。不同裂纹缺陷深度试样在0.9 MPa冲击压力下,呈现出不同程度的裂纹扩展,多重冲击会叠加损伤,临界失效裂纹深度比例为50%~75%。残样分析显示基体裂纹、颗粒脱粘和颗粒断裂是惰性推进剂主要的失效机制。该结果对评估点火冲击条件下固体火箭发动机的结构完整性具有一定的参考价值。
Solid propellants with crack defects are susceptible to crack propagation under shock wave loading during their service life,significantly affecting their structural integrity.The dynamic mechanical response and defect-induced damage evolution of hydroxyl-terminated polybutadiene(HTPB)propellants under varying shock wave intensities are investigated using a shock tube apparatus,and the schlieren imaging and 3D digital image correlation(3D-DIC)techniques.Shock wave loading experiments are conducted on both defect-free and crack-defected propellant specimens within a pressure range of 0.3 to 0.9 MPa,and the dynamic deformation and damage evolution processes of propellant specimens are captured in the experiments.The results indicate that the deformation of the defect-free specimen exhibits a parabolic profile,and The deformation of the sample increases with the increase in impact pressure.The specimens with different crack depths show different degrees of crack growth under 0.9 MPa impact pressure,and the multiple impacts will result in superimposed damage.The critical failure crack depth ratio is 50%-75%.Residual specimen analysis reveales that the matrix cracking,particle debonding,and particle fracture are the primary failure mechanisms.These findings provide valuable insights for assessing the structural integrity of solid rocket motors under ignition shock condition.
作者
王冉
张益铭
郭松林
王灏森
王宁飞
武毅
WANG Ran;ZHANG Yiming;GUO Songlin;WANG Haosen;WANG Ningfei;WU Yi(School of Aerospace Engineering,Beijing Institute of Technology,Beijing 100081,China;Chongqing Innovation Center,Beijing Institute of Technology,Chongqing 401100,China)
出处
《兵工学报》
北大核心
2025年第7期121-129,共9页
Acta Armamentarii
关键词
冲击波载荷
预制损伤
固体推进剂
失效模式
shock wave load
prefabricated damage
solid propellant
failure mode
