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Application of the Acoustic Emission Technique for Damage Identification in the Fiber Reinforced Polymer Composites
 
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Lublin University of Technology, ul. Nadbystrzycka 36, 20-618 Lublin, Poland
CORRESPONDING AUTHOR
Sylwester Samborski   

Lublin University of Technology, ul. Nadbystrzycka 36, 20-618 Lublin, Poland
Publication date: 2022-11-17
 
Adv. Sci. Technol. Res. J. 2023; 17(1):210–221
 
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ABSTRACT
A set of experiments having in target determination of fracture resistance was performed on the Fiber Reinforced Polymer (FRP) composites specimens with an additional monitoring of damage onset and evolution with a so-called Acoustic Emission (AE) technique. The AE technique is a non-destructive material testing method, which enables registering the phenomena usually not audible with a human ear - the frequency bands lay between 100 and 1000kHz. For the FRP composites this enables monitoring various damage phenomena - matrix cracking, delamination, fiber cracking etc. by acquisition and subsequent analysis of several AE parameters: number of hits, number of counts, amplitude or energy of the signal. In the paper advantages of a deeper analysis of the raw AE signal was presented with an application of the Fast Fourier Transform (FFT), leading to a more detailed damage identification along the whole loading procedure. The study proved the usability of the AE method in damage monitoring of the FRPs; a bundle of illustrative examples of chosen acoustic emission parameters’ evolution displayed on the background of the load applied to composite specimens was presented in the Appendix, where the results for the energy, as well as the cumulated number of hits were plotted and interpreted.