Defect Characterization in Layered Composites using a Pulsed Eddy-Current Technique
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Characterization in Layered Composites using a Pulsed Eddy-Current Technique A. M. Kokurova,b*, D. S. Malushinc,d, B. A. Chichigind, D. E. Subbotina, and A. O. Kusnetsovd,e a PJSC
b
Tupolev, Moscow, 105005 Russia Blagonravov Mechanical Engineering Research Institute of the Russian Academy of Sciences, Moscow, 101000 Russia c ERPC Nondestructive Testing Facilities, Russian Technological University—MIREA, Moscow, 119454 Russia d National Research University Moscow Power Engineering Institute, Moscow, 11250 Russia e JSC Central Scientific Research Institute for Special Machine-Building, Chot’kovo, 141371 Russia *e-mail: [email protected] Received June 4, 2020; revised July 30, 2020; accepted July 30, 2020
Abstract—The practical possibility of determining the size of the delamination area and its depth of location in nonmetallic multilayer low-conductive materials is demonstrated using the unique pulsed eddy current equipment facilities. Operational integrity and efficiency of the application of the developed techniques and engineering solutions are confirmed by the results of the experimental studies performed on the carbon-fiberreinforced plastic specimens with artificial defects in the form of delaminations varying in sizes and shapes. Keywords: pulsed eddy-current technique, defect, damage, layered composite, carbon fiber. DOI: 10.1134/S106378502011022X
General trends in the development of engineering production are characterized by increasing requirements of application of multilayer composite materials (CMs), which are already widely used in engineering—in particular, in the aerospace industry [1]. In the course of the manufacturing and operation of layered CM products, different local structural failures often occur within the material, the most dangerous of which are debondings and delaminations. Disruption of adhesion between composite plies along with their partial fracture can lead to a sharp decrease in the strength characteristics of the structure [2]. For consistent assessment of behavior of a damaged CM product under loading, a comprehensive calculation-0experimental study should be implemented, an essential part of which is precise and reliable determination of correct boundaries of defects, their areas, and depth location within the composite laminate. To solve the problem of evaluation of composite structural elements, different techniques of nondestructive testing are widely used, including ones that have been newly developed. In particular, evaluation techniques, such as optical interferometry (holography, shearography, electronic and digital speckle interferometry) are being increasingly developed [3]. At the same time, traditional methods of nondestructive testing are more often used to solve these problems [4]. Nevertheless, experience in testing of CM structures makes it possible to claim that the application of
some single method is not enough to obtain enough data for reliable determination of all the aforementioned geometrical parameters of defects. Widely used techniques of acoustic
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