固体发动机推进剂/衬层粘接试件振动损伤分析

Vibration Damage Analysis of Propellant/Liner Specimen for Solid Rocket Motors

以固体发动机的推进剂/衬层粘接试件为研究对象,设计了单向拉伸试验夹具,开展了三种不同频率的振动加速试验以及单向剪切拉伸试验,应用双因素方差分析法探究了振动时间、振动频率对试件最大剪应力强度的影响规律。结果表明,不同频率下的振动试验对推进剂/衬层粘接试件最大剪应力强度的影响无明显区别,且理论振动时间与振动频率之间不存在明显的交互作用;同一频率下,推进剂/衬层粘接试件所能承受的最大剪应力随理论振动时间的增加而减小;从原始未振动状态至理论振动180 d时,三种频率下试件的最大剪应力强度估计边际均值比初始最大剪应力强度分别下降了6.24%、6.15%和6.56%。

In this paper,the propellant/liner bonding test piece of solid rocket motor is taken as the research object,and the uniaxial tensile test fixture is designed.Three different frequencies of vibration acceleration test and one-way shear tensile test are carried out.The influence of vibration time and vibration frequency on the maximum shear stress of the specimen is investigated by two-way analysis of variance.The results show that the vibration test at different frequencies has no significant difference on the maximum shear stress intensity of the propellant/liner bonded test piece,and there is no obvious interaction between the theoretical vibration time and the vibration frequency.At the same frequency,the maximum shear stress that the propellant/liner bonded specimen can withstand decreases with increasing theoretical vibration time.From the original unvibrated state to the theoretical vibration of 180d,the estimated maximum shear stress intensity of the specimen at three frequencies decreased by 6.24%,6.15%and 6.56%compared with the initial maximum shear stress.