Acoustic emission characteristics of epoxy resin casting when tensile failure occurs

The acoustic emission combined with pattern recognition technologies are increasingly applied to identify the damage modes of composites, among which the stability of acoustic emission signal is undoubtedly the basis of the damage identification. This paper studied the acoustic emission signal stability of epoxy resin matrix commonly used in polymer matrix composites, focusing on how the signal characteristics are influenced by the signal propagation distance of the acoustic emission. The experimental results show that as the propagation distance of the acoustic signal increases, the absolute energy, peak frequency, and centroid frequency decrease regularly, whereas the amplitude and energy change irregularly.