In this paper a result of the registered acoustic emission (AE) signals during static deformation and destruction of the polymer composite material (PCM) study is presented. Analysis of the total AE accumulation, changing of the Ib-value and probability densities of peak amplitudes and median frequencies of the AE signals was done. An approach for the PCM destruction stages identification and the bearing capacity determination based on the energy and frequency analysis of the AE signals wavelet decomposition is proposed.
This paper presents the results of the study of strength and fracture processes of FRP samples, obtained by vacuum and vacuum-autoclave molding methods. The experimental studies consisted of a three-point bending test with step loading, accompanied by an acoustic emission method. Based on the acoustic emission data recorded using the acoustic-emission software and hardware complex during the experiments, a method for estimating the accumulated damage using various techniques for analyzing acoustic emission parameters was tested. The results of methods for analyzing the power-law coefficient of accumulation of total AE, b-value and density distribution of amplitudes and median frequencies are considered. An estimate of the power-law coefficient of accumulation of the total AE made it possible to determine the bearing capacity of PCM samples. Using the techniques for analyzing the amplitude distribution of the AE signals and the distribution density of the amplitudes and median frequencies of the AE signals, destructive processes in the volume of samples were described and the stages of their damaging were revealed.
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