PSI - Issue 16

Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 16 (2019) 11–18

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” organizers. © 2019 The Author(s). Published by Elsevier B.V. Peer- review under responsibility of the 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” organizers We solve the problem of normal waves diffraction in an elastic layer rigidly onnected with interfac on an int rface c ack under the action of antipl ne dynamic loading. The Wiener – Hopf technique is applied f r the solution. The reson nce vibrations of th ynamic system on the main mode ar investigated. The subtractive synchro ized lectro ic speckle p ttern interfero try technique and the approach based on estimation of the dynamic speckle motion of surface areas of multilayer composites were developed for detection of subsurface defects. Experimental breadboards realizing these techniques are created and experiments to identify test and real s surface defects are fulfilled. © 2019 The Author(s). Published by Elsevier B.V. Peer- review under responsibility of the 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” organizers 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” To the problem of the subsurface defects detection: theory and experiment Zinoviy Nazarchuk, Leonid Muravsky*, Dozyslav Kuryliak Karpenko Physico-Mechanical Institute of the National Academy of Sciences of Ukraine, 5 Naukova St., Lviv 79060, Ukraine 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” To the problem of the subsurface defects detection: theory and experiment Zinoviy Nazarchuk, Leonid Muravsky*, Dozyslav Kuryliak Karpenko Physico-Mechanical Institute of the National Academy of Sciences of Ukraine, 5 Naukova St., Lviv 79060, Ukraine Abstract We solve the problem of normal waves diffraction in an elastic layer rigidly connected with interface on an interface crack under the action of antiplane dynamic loading. The Wiener – Hopf technique is applied for the solution. The resonance vibrations of the dynamic system on the main mode are investigated. The subtractive synchronized electronic speckle pattern interferometry technique and the approach based on estimation of the dynamic speckle motion of surface areas of multilayer composites were developed for detection of subsurface defects. Experimental breadboards realizing these techniques are created and experiments to identify test and real subsurface defects are fulfilled. Keywords: subsurface defects; nondestructive techniques; wave diffraction; speckle interferogram; speckle pattern; ultrasonic excitation. Abstract

Keywords: subsurface defects; nondestructive techniques; wave diffraction; speckle interferogram; speckle pattern; ultrasonic excitation.

1. Introduction

1. Introduction

Multilayer composites are widely used in many industrial areas and their contribution in machines, aircrafts, vehicles, buildings, etc. increases permanently. The strength and stiffness of multilayer composites depend directly on the presence of manufacturing and operating defects that are located predominantly between the composite layers. The reliable detection and localization of these defects is one of the main problems of nondestructive testing (NDT). There are some NDT techniques based on mechanical impedance, ultrasonic (US) and infrared inspection of Multilayer composites are widely used in many industrial areas and their contribution in machines, aircrafts, vehicles, buildings, etc. increases permanently. The strength and stiffness of multilayer composites depend directly on the presence of anufacturing and operating defects that are located predominantly between the composite layers. The reliable detection and localization of these defects is one of the main problems of nondestructive testing (NDT). There are some NDT techniques b sed on mechanical impedance, ultrasonic (US) and infrared inspection of

* Corresponding author. Tel.: +38-032-263-3388; fax: +38-032-2649427. E-mail address: muravskyleon@gmail.com * Corresponding author. Tel.: +38-032-263-3388; fax: +38-032-2649427. E-mail address: muravskyleon@gmail.com

2452-3216 © 2019 The Author(s). Published by Elsevier B.V. Peer-review under responsibility of the 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” organizers 2452-3216 © 2019 The Author(s). Published by Elsevier B.V. Peer-review under responsibility of the 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” organizers

2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” organizers. 10.1016/j.prostr.2019.07.016