Elastodynamic Scattering From Inclusions Surrounded by Thin Interface Layers

[+] Author and Article Information
P. Olsson, A. Bostrom

Division of Mechanics, Chalmers University of Technology, Göteborg, Sweden

S. K. Datta

Department of Mechanical Engineering and CIRES, University of Colorado, Boulder, CO 80309

J. Appl. Mech 57(3), 672-676 (Sep 01, 1990) (5 pages) doi:10.1115/1.2897075 History: Accepted February 20, 1989; Received February 20, 1989; Online March 31, 2008


The scattering of elastic waves by elastic inclusions surrounded by interface layers is a problem of interest for nondestructive evaluation of interfaces in composites. In the present paper the scattering by a single elastic inclusion is studied. The scattering problem is solved by means of the null field approach and the properties of the interface layer enters through the boundary conditions on the inclusion. Various ways of doing this have been tried, from the simpler approach of just keeping the inertia of the layer, to using a membrane type of approximation or a more sophisticated method that includes all effects to first order in the layer thickness. The results obtained by using these different methods are compared numerically and with the exact solution for a layered sphere and with some recent results for a spheroid obtained using a hybrid finite element and wave function expansion technique. The numerical results show significant dependence on parameters containing the thickness and stiffness of the interface layer.

Copyright © 1990 by The American Society of Mechanical Engineers
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