Technical Diagnostics and Non-Destructive Testing, 2024, №04



2024 №04 (02)

DOI of Article 10.37434/tdnk2024.04.03

2024 №04 (04)

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Technical Diagnostics and Non-Destructive Testing #4, 2024, pp. 18-22

Detection of circular subsurface defects in laminated composites using optical-acoustic nondestructive testing system

O.M. Sharabura, L.I. Muravsky, O.G. Kuts

G.V. Karpenko Physico-Mechanical Institute of NASU. 5 Naukova str., 79060, Lviv, Ukraine. E-mail: muravskyleon@gmail.com

An optical-acoustic system layout for nondestructive testing of subsurface defects in laminated composites is created. Detection and localization of subsurface defects in composite laminated structures with the help of the optical-acoustic system layout is performed by forming a series of dynamic speckle patterns of the composite surface, which is excited by a flexural elastic wave, their subsequent registration and accumulation in order to generate differential digital speckle patterns and extract optical spatial responses from defects. To assess the efficiency of detecting such defects, fiberglass laminated structures were manufactured containing three layers of glass textolite plates and circular flat defects of various sizes in the middle layer. Based on the conducted studies, an experimental dependence of the fundamental resonance frequency of circular subsurface defects on their sizes was obtained, which is close to the theoretically plotted one. It is shown that using the created optical-acoustic system layout, it is possible to detect such defects in a wide range of changes in their sizes. 24 Ref., 5 Fig.
Keywords: optical-acoustic system, dynamic speckle pattern, circular subsurface defect, region of interest, difference speckle pattern, elastic wave, laminated composite

Received: 24.10.2024
Received in revised form:14.11.2024
Accepted: 20.12.2024

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