Detection of hidden defects in composite material using the standing waves method

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Abstract

As a result of the measurements carried out using the standing waves method, the hidden defects were detected inside the prosthetic feet details made of composite material. When comparing the obtained amplitude-frequency spectra of intact samples and samples with defects based on the first peaks corresponding to the first bending wave modes, it was revealed that the values of the resonant frequencies of defective samples were lower relative to the frequency values of the spectra of intact samples. That observation indicated that the material of defective products might have reduced strength characteristics. Also, when studying some samples, the presence of additional peaks was noted, which indicated the appearance of new reflection boundaries corresponding to the appearance of defects in the research samples. Maps of amplitude distributions in the studied samples were obtained. A preliminary comparison was made with the results of examining samples using the OmniScan X3 device manufactured by OLYMPUS. The results obtained indicate the presence of an increased number of reflection boundaries, as well as an increased content of bulges, which probably arise during the process of gluing products in a defective sample in comparison with a stronger one. The analysis confirms the possibility of successfully using the standing waves method as a method for detecting hidden defects in composite material.

About the authors

K. V. Fedin

Trofimuk Institute of Petroleum Geology and Geophysics SB RAS

Email: FedinKV@ipgg.sbras.ru
Russian Federation, Novosibirsk, Akademika Koptyuga Pr. 3, 630090

O. K. Marilov

Novosibirsk State Technical University

Author for correspondence.
Email: oleqmarilov@gmail.com
Russian Federation, Novosibirsk, Kirova str. 48, 630073

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