Effect of fiber layout on signal analyzing of carbon/glass/epoxy hybrid composite laminates flexural loading using acoustic emission

Abstract

In this study, Glass, Carbon and Epoxy Hybrid Composite laminates were loaded under flexural loading and monitored by an acoustical sensor and therefore, the effect of fiber layout in hybrid composite laminates on acoustical signal processing was studied. In fact, in order to diagnosis full frequency areas of the emitted signals and determining fracture mechanisms, also to obtain maximum load frequency and time; signal processing is necessary. Wavelet and Choi–Williams transforms, two analytical methods, were used to investigate the acoustic signal. Based on the results, Choi–Williams Analysis maximum frequencies have 0, 5%, −5% and −4% variation in compare with Wavelet Analysis maximum frequencies in Specimens A, B, C, and D respectively.Adding Nanoparticles to the polymer matrix composites increases inter-laminar adherence, and the possibility of delamination occurrence decreases considerably. Also, Wavelet coefficients are 4.5, 33.3, 6.3 and 18.75 times less than Choi–Williams coefficients in Specimens A, B, C, and D respectively. For more detailed studies, SEM images have been prepared.