Issue 46

A. Kostina et alii, Frattura ed Integrità Strutturale, 46 (2018) 332-342; DOI: 10.3221/IGF-ESIS.46.30 332 Numerical simulation of a heat generation in a layered material during ultrasonic wave propagation Anastasiia Kostina Research and Education Center "Materials", Don State Technical University, Rostov-on-Don, Russia kostina@icmm.ru , http://orcid.org/0000-0002-5721-3301 Oleg Plekhov Institute of Continuous Media Mechanics of the Ural Branch of Russian Academy of Sciences, Perm, Russia poa@icmm.ru , http:/ orcid.org/ 0000-0002-0378-8249 Sergey Aizikovich Research and Education Center "Materials", Don State Technical University, Rostov-on-Don, Russia saizikovich@gmail.com, http://orcid.org/0000-0002-2756-5752 A BSTRACT . Ultrasonic vibrothermography is an effective and non-destructive method, which can be used for a quick detection of coating defects on large surfaces. Mechanical excitation of a layered structure induces inelastic deformation and, as a consequence, energy dissipation in the defective area and local heating. In this work, a three-dimensional numerical simulation of this process is applied to the bi-metallic layered structure with an edge crack. Two models of energy dissipation are considered (hysteretic damping model and visco-elastic Maxwell’s model) for simulation of energy dissipation in a crack tip area under ultrasonic loading. The models allow us to study the effects of the loading frequency, loading direction and location of the coating defects on the heat dissipation and propose optimal regimes for the ultrasonic vibrothermography of bi-metallic layered structures. K EYWORDS . Ultrasonic thermography; Non-destructive technique; Energy dissipation; Finite-element analysis. Citation: Kostina, A., Plekhov, O., Aizikovich, S., Numerical simulation of a heat generation in a layered material during ultrasonic wave propagation, Frattura ed Integrità Strutturale, 46 (2018) 332-342. Received: 08.08.2018 Accepted: 10.09.2018 Published: 01.10.2018 Copyright: © 2018 This is an open access article under the terms of the CC-BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. I NTRODUCTION ltrasonic vibrothermography is a safe, non-destructive technique, which can be applied to the detection of defects in metals and composite materials [1-3]. This method is an effective way to study characteristics of the coating and monitor hidden defects. The loading frequency, loading direction and location of the coating defects U