Static tensile test of three dimension needled C/SiC composite material (3D-N C/SiC) was carried out at room temperature and damage processes of the composite was monitored online by an acoustic emission (AE) instrument. Noise information in the AE signals was removed according to Wavelet theory, and K-means clustering was used to analyze the AE signals. Combined with SEM observation, five damage modes were found during the tension: matrix cracking, interfacial debonding, interfacial sliding, individual fiber breakage, and fiber bundle rupture. The damage signal of 3D-N C/SiC composite contained three main frequencies at 240, 370 and 455 kHz, corresponding to interface damage, matrix damage and fiber fracture, respectively. Damage evolutionary mechanism was proposed through AE events and cumulative energy variation with loading time.
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