Abstract
Nondestructive quality control of small-thickness composites is an important scientific and technical problem due to significant damage inflicted on materials even with minor impact loads. The stability of a 1-mm–thick CFRP composite to impact damage with an energy of up to 10 J has been investigated. Special attention has been paid to the analysis of the “visible” area of defects formed as a result of successive striking with increasing and decreasing energy in the range from 1 to 5 J. The area of defect indications was estimated by analyzing the images of vibrations at the surface of the composite produced by its acoustic stimulation and laser vibroscanning.
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Funding
The method of resonant ultrasonic vibrometry and the approach to quality control (Sect. 1) were developed by D.A. Derusova under a grant from the Russian Science Foundation, project no. 18-79-00029 at Tomsk Polytechnic University; Sect. 2 was implemented as part of the Competitiveness Program of Tomsk Polytechnic University; Sect. 3 was carried out with financial support from the Russian Foundation for Basic Research and from Tomsk Oblast in the framework of scientific project no. 18-41-703002.
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Translated by V. Potapchouck
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Shpil’noi, V.Y., Vavilov, V.P., Derusova, D.A. et al. Studying Stability of CFRP Composites to Low-Energy Impact Damage by Laser Vibrometry. Russ J Nondestruct Test 55, 639–647 (2019). https://doi.org/10.1134/S1061830919090080
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DOI: https://doi.org/10.1134/S1061830919090080