Title :
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
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;
Conference_Titel :
Ultrasonics Symposium, 1996. Proceedings., 1996 IEEE
Conference_Location :
San Antonio, TX
Print_ISBN :
0-7803-3615-1
DOI :
10.1109/ULTSYM.1996.584116
