Wave reflection at a slightly undulating interface

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Abstract

Currently, most of the ultrasonic techniques for the nondestructive evaluation of composite materials are based on the assumption that the interfaces between the plies are perfectly flat. In reality, interfaces between the plies in composite laminates are slightly undulated because of non-uniform resin thickness and fiber spacing, or because of interfacial defects such as interface cracks and delaminations. It is believed that many of the existing discrepancies between the theoretical predictions and experimental observations are, to some degree, due to this over-idealized assumption. The purpose of this paper is to study wave reflection and refraction at a slightly undulating interface between two solids. Asymptotic solutions to the coefficients of reflection and refraction are derived as functions of the incident wave angle, the incident wave frequency and the characteristics of the undulating interface. The method of asymptotic expansion is used in conjunction with the Fourier transforms. Critical angles for the incident wave are investigated. Applications of the results to non-destructive evaluation of interface defects are discussed.

Original languageEnglish
Title of host publicationVibro-Acoustic Characterization of Materials and Structures
Pages73-77
Number of pages5
StatePublished - 1992
EventWinter Annual Meeting of the American Society of Mechanical Engineers - Anaheim, CA, USA
Duration: 8 Nov 199213 Nov 1992

Publication series

NameAmerican Society of Mechanical Engineers, Noise Control and Acoustics Division (Publication) NCA
Volume14

Conference

ConferenceWinter Annual Meeting of the American Society of Mechanical Engineers
CityAnaheim, CA, USA
Period8/11/9213/11/92

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