Electronic Journal Technical Acoustics ISSN 1819-2408

H. Rhimini, M. El Allami, M. Sidki, A. Haddout, M. Benhadou

Ultrasonic guided waves in tri-layer structure. Application to study the interaction of guided waves with hidden defect at low frequency

language: English

received 25.06.2016, published 23.09.2016

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ABSTRACT

The article presents a study of guided ultrasonic waves in a tri-layer structure formed of two aluminium plates assembled with a layer of epoxy resin. The resolution of the dispersion equation was used to plot the dispersion curves and to determine the energy distribution of a given mode propagating within the structure. On the other hand, the evaluation of the interaction of guided modes at low frequency with hidden defect placed either in one of the aluminium plates at the interface between aluminium and the adhesive layer was presented. The analyse of the reflected and transmitted waves in the dual space (wave number, frequency) permitted the separation and the identification of the propagating guided modes and showed the conversion phenomenon of the incident mode into other guided modes after the reflection and the transmission. Finally a quantification of the energy of the reflected and transmitted modes is presented.

Keywords: guided waves, adhesive structure, conversion modes, dispersion curves.

14 pages, 13 figures

Сitation: H. Rhimini, M. El Allami, M. Sidki, A. Haddout, M. Benhadou. Ultrasonic guided waves in tri-layer structure. Application to study the interaction of guided waves with hidden defect at low frequency. Electronic Journal “Technical Acoustics”, http://www.ejta.org, 2016, 5.

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		Hassan Rhimini received his master and PhD from Chouaib Doukkali University, EL Jadida, Morocco. He has published over 18 publications and communications on acoustics and modelling of ultrasound propagation. Hassan Rhimini is a Research Professor at the National High School of Electricity and Mechanics, Hassan II University, Casablanca, Morocco. E-mail: h.rhimini(at)ensem.ac.ma
		Mhammed El Allami received his master and PhD from Chouaib Doukkali University, EL Jadida, Morocco. He has published over 12 publications and communications on modelling of Lamb modes signals in plates. Mhammed El Allami is a Research Professor at CRMEF, Settat and member of Laboratory of Mechanics Energy Electronics Telecommunications, Hassan II University, Settat, Morocco. E-mail: m.elallami(at)gmail.com
		Mouncif Sidki received his master from Paul Sabatier University, Toulouse, France and PhD from Sherbrooke University, Sherbrooke, Canada. He has published over 35 publications and communications on acoustics and modelling of ultrasound propagation. Mouncif Sidki is a Research Professor at Chouaib Doukkali University, El Jadida, Morocco. E-mail: sidkimouncif(at)hotmail.com
		Abdellah Haddout - Professor at the National High School of Electricity and Mechanics, Hassan II University, Casablanca Morocco. Director of the laboratory ”Industrial Management, Energy and Technology of plastics and composites materials”. Email: Abdellahhaddout(at)yahoo.fr
		Mariam Benhadou - Professor at the National High School of Electricity and Mechanics, Hassan II University, Casablanca Morocco. PHD in applied mechanics and industrial materials. Head of the research team “Eco-design, modeling and developing industrial plastics and composites materials”. Email: mariambenhadou(at)yahoo.fr