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Scattering of elastic waves by a rectangular crack in an anisotropic half-space

Anders Boström (Institutionen för tillämpad mekanik, Dynamik) ; Thomas Grahn (Institutionen för tillämpad mekanik, Dynamik) ; A. Jonas Niklasson (Institutionen för mekanik och hållfasthetslära)
Wave motion (0165-2125). Vol. 38 (2003), p. 91-107.
[Artikel, refereegranskad vetenskaplig]

The scattering of elastic waves by a rectangular crack in a half-space of arbitrary anisotropy is considered. The application in mind is ultrasonic testing of thick-walled anisotropic components where the crack is close to a planar back surface. The orientation of the crack and the back surface may be arbitrary relative the anisotropy. The scattering problem is formulated as hypersingular integral equation for the crack-opening-displacement (COD) by means of a half-spce Green's tensor. The integral equation is solved by expanding the COD in a double series of Chebyshev functions with the correct behavior along the crack's edges. Insertion inte the integral equation and projection onto the same set of functions result in a linear system of equations for the expansion coefficients appearing in the representation of the COD. The transmitting transducer is modeled by the traction beneath it on the scanning surface and the incident field may then be calculated. An electromechanical reciprocity relation is used to model the receiving transducer. Numerical examples are included which show the influence of the anisotropy and espcially the prexence of a nearby planar back surface.

Nyckelord: ultrasonic waves, anisotropy, crack, rectangular, nondestructive testing



Denna post skapades 2016-04-04.
CPL Pubid: 234048

 

Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Dynamik
Institutionen för mekanik och hållfasthetslära (1972-2003)

Ämnesområden

Teknisk mekanik

Chalmers infrastruktur