On the modelling of ultrasonic testing using boundary integral equation methods
Doktorsavhandling, 2011

Ultrasonic nondestructive testing has important applications in, for example, the nuclear power and aerospace industries, where it is used to inspect safety-critical parts for flaws. For safe and reliable testing, mathematical models of the ultrasonic measurement systems are invaluable tools. In this thesis such measurement models are developed for the ultrasonic testing for defects located near non-planar surfaces. The applications in mind are the testing of nuclear power plant components such as thick-walled pipes with diameter transitions, pipe connections, etc. The models use solution methods based on frequency domain boundary integral equation methods, with a focus on analytical approaches for the defects and regularized boundary element methods for the non-planar surfaces. A major benefit of the solution methods is the ability to provide accurate results both for low, intermediate and high frequencies. The solution methods are incorporated into a framework of transmitting probe models based on prescribing the traction underneath the probe and receiving probe models based on electromechanical reciprocity. Time traces are obtained by applying inverse temporal Fourier transforms, and it is also shown how calibration and effects of material damping can be included in the models.

Boundary element method

Regularization

Ultrasonics

Boundary integral equation method

T matrix.

Elastic waves

Nondestructive testing

Scattering

HA2
Opponent: Andrés Saéz

Författare

Jonathan Westlund

Chalmers, Tillämpad mekanik, Dynamik

A 2D model of ultrasonic testing for cracks near a non-planar surface

Wave Motion,; Vol. 47(2010)p. 383-394

Artikel i vetenskaplig tidskrift

2D SH modelling of ultrasonic testing for cracks near a non-planar surface

Engineering Analysis with Boundary Elements,; Vol. 33(2009)p. 1103-1112

Artikel i vetenskaplig tidskrift

Ämneskategorier

Maskinteknik

ISBN

978-91-7385-502-0

Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie: 3183

HA2

Opponent: Andrés Saéz