Cut-off properties of leaky surface waves for the evaluation of adhesive-adherend interlayers by acoustic microscope

Author

Zinin, P. ; Lefeuvre, O. ; Goldfarb, L. ; Briggs, G.A.D. ; Zeller, B.D. ; Kinloch, A.J. ; Cawley, P. ; Robert, L. ; Thompson, G.E.

Author_Institution

Dept. of Mater., Oxford Univ., UK

Volume

2

fYear

1996

fDate

3-6 Nov 1996

Firstpage

803

Abstract

The standard surface pre-treatment used on aluminium adherends in aerospace applications produces a porous oxide structure on the adherend surface. The adhesive penetrates some distance into the pores to form a microcomposite. The thickness of these interlayers in a typical aluminium-epoxy joint is of the order of 1 μm only. Surface acoustic wave measurements have been carried out with an acoustic microscope at frequencies between 220 and 980 MHz for different thicknesses of oxide layer. A good agreement has been found between the predictions and the acoustic microscope measurements. Attention has been focused on the anomalous behaviour of the attenuation around the cutoff

Keywords

acoustic dispersion; acoustic microscopy; adhesion; aerospace testing; elastic constants; surface acoustic waves; ultrasonic materials testing; 220 to 980 MHz; acoustic microscope; adhesive-adherend interlayers; aerospace applications; anomalous behaviour; cut-off properties; leaky surface waves; microcomposite; porous oxide structure; surface acoustic wave measurements; surface pre-treatment; Acoustic measurements; Aluminum; Attenuation; Educational institutions; Frequency measurement; Microscopy; Surface acoustic waves; Surface waves; Thickness measurement; Ultrasonic variables measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1996. Proceedings., 1996 IEEE

Conference_Location

San Antonio, TX

ISSN

1051-0117

Print_ISBN

0-7803-3615-1

Type

conf

DOI

10.1109/ULTSYM.1996.584116

Filename

584116