摘要
为揭示固体火箭发动机碳纤维缠绕复合材料壳体多载荷工况下的失效机理,开展了单向T800碳纤维复合材料试件不同偏轴角度下的拉伸实验。利用声发射(AE)无损测试技术获得了试件完整波形信号,结合Pearson相关系数选取了AE信号的特征参数,通过K-means聚类算法对AE信号进行了聚类分析,同时结合扫描电镜(SEM)拍摄的微观断口形貌将不同的损伤机制与声发射聚类组对应。进一步利用代表性体积单元并结合渐进损伤方法,实现了单向复合材料损伤过程的数值模拟。分析结果表明,AE信号的峰值频率与幅值两类参数的相关系数低于0.2。采用二者对AE信号进行聚类分析,同时结合数值仿真获得的应力-应变曲线,发现纤维断裂峰值频率最高,基体开裂峰值频率居中,界面脱粘峰值频率最低,试件宏观破坏时的AE信号幅值最高。
To reveal the failure mechanism of the carbon fiber wound composite case in solid rocket motors under multiple load conditions,tensile tests were carried out on unidirectional T800 carbon fiber reinforced plastic specimens under different off-axis angles.By employing acoustic emission(AE) non-destructive testing technology,complete waveform signals of the specimens were acquired,and characteristic parameters of AE signals were selected using the Pearson correlation coefficient.The K-means clustering algorithm was used to cluster AE signals,and the different damage mechanisms were corresponding to the AE cluster based on the microscopic fracture morphology captured by scanning electron microscopy(SEM).Furthermore,representative volume elements in conjunction with a progressive damage method was utilized to realize the numerical simulation of damage process of unidirectional composites.The analysis results show that the correlation coefficient between the peak frequency and amplitude of the AE signal is less than 0.2.By combining with the stress-strain curve obtained from numerical simulation,cluster analysis is conducted on the AE signal using the two parameters,which indicate that fiber breakage has the highest peak frequency,matrix cracking has an intermediate peak frequency,interface debonding has the lowest peak frequency and the AE signal amplitude is highest when macroscopic damage occurr in the test specimen.
作者
董少静
李凯
丁文辉
王立强
申秀丽
DONG Shaojing;LI Kai;DING Wenhui;WANG Liqiang;SHEN Xiuli(School of Energy and Power Engineering,Beihang University,Beijing 100191,China;Academy of Aerospace Solid Propulsion Technology,Xi'an 710025,China;Xi'an Institute of Aerospace Propulsion Technology,Xi'an 710025,China)
出处
《固体火箭技术》
CAS
CSCD
北大核心
2024年第3期411-420,共10页
Journal of Solid Rocket Technology
关键词
碳纤维复合材料
固体火箭发动机
纤维缠绕壳体
声发射
偏轴拉伸
聚类分析
渐进损伤
carbon fiber composite
solid rocket motor
filament-wound case
acoustic emission
off-axis tensile
cluster analy-sis
progressive damage
