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A hybrid T matrix/boundary element method for elastic wave scattering from a defect near a non-planar surface

Jonathan Westlund (Institutionen för tillämpad mekanik, Dynamik) ; Anders Boström (Institutionen för tillämpad mekanik, Dynamik)
Journal of nondestructive evaluation (0195-9298). Vol. 31 (2012), p. 148-156.
[Artikel, refereegranskad vetenskaplig]

The in-plane P-SV scattering of elastic waves bya defect and a close non-planar surface is considered. A hybrid T matrix/boundary element approach is used, where a boundary integral equation is used for the non-planar surface and the Green’s tensor in this integral equation is chosen as the one for the defect and thus incorporates the transition (T ) matrix of the defect. The integral equation is iscretized by the boundary element method in a standard way. Also models of ultrasonic probes in transmission and reception are included. In the numerical examples the defect is for simplicity chosen as a circular cavity. This cavity is located close to a non-planar surface, which is planar except for a smooth transition between two planar parts. It is illustrated that the scattering by the cavity and the non-planar surface becomes quite complicated, and that shielding and masking may appear.

Nyckelord: Boundary integral method, boundary element method, scattering, ultrasonics T matrix

Denna post skapades 2012-12-17. Senast ändrad 2016-02-08.
CPL Pubid: 168000


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Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Dynamik


Teknisk mekanik

Chalmers infrastruktur