Abstract The fundamentals of acoustic emission behavior in SiC fiber reinforced titanium matrix composites were investigated. In order to obtain preferred damage modes and provide insight into damage identification, the acoustic emission responses in the fiber tensile test, the matrix tensile test, the longitudinal tensile test and the transverse tensile test for the single fiber composite were studied respectively. Extracted signals of fiber fracture, matrix deformation, matrix fracture, fiber fragmentation, fracture of the fiber-matrix reaction layer and interface debonding were analyzed by waveform pattern, frequency contents and time-frequency distribution. The signal characteristics with respect to amplitude, waveform shape, frequency centroid and wave modes were given for different damage modes. Furthermore, the generation and propagation mechanisms of multiple signals were also discussed with the assistance of theoretical models.

中文翻译：

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基于声发射的纤维增强钛基复合材料损伤识别

摘要 研究了碳化硅纤维增强钛基复合材料声发射行为的基本原理。为了获得优选的损伤模式并深入了解损伤识别，分别研究了单纤维复合材料在纤维拉伸试验、基体拉伸试验、纵向拉伸试验和横向拉伸试验中的声发射响应。对提取的纤维断裂、基体变形、基体断裂、纤维碎裂、纤维-基体反应层断裂、界面脱粘等信号进行波形图、频率含量和时频分布分析。针对不同的损伤模式，给出了关于幅度、波形形状、频率质心和波模式的信号特征。此外，