TY - GEN
T1 - Wave reflection at a slightly undulating interface
AU - Qu, Jianmin
PY - 1992
Y1 - 1992
N2 - 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.
AB - 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.
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M3 - Conference contribution
AN - SCOPUS:0027002945
SN - 0791811255
T3 - American Society of Mechanical Engineers, Noise Control and Acoustics Division (Publication) NCA
SP - 73
EP - 77
BT - Vibro-Acoustic Characterization of Materials and Structures
T2 - Winter Annual Meeting of the American Society of Mechanical Engineers
Y2 - 8 November 1992 through 13 November 1992
ER -