- Conference date: 15–20 July 2012
- Location: Denver, Colorado, USA
Ultrasound wave scattering from the rough surfaces of defects is an important consideration for the qualification of safety-critical inspections because some species of fabrication and service-induced defects are rough. Whereas the surfaces of flat defects only reflect specularly, an incident wave reflects over a range of angles when the surface is rough. This affects the inspection performance because the coefficient of the specular reflection is reduced, while the detection of reflections at other angles becomes possible. An infinite periodic surface is a simple form of rough surface, which has been well investigated since Rayleigh, and can be useful to provide general insight into the nature of the wave scattering. Furthermore, in the context of scattering from cracks, the study of an infinite surface enables examination of the reflections from the surface and behavior at the surface without the presence of the crack tip diffraction fields. In this paper, an infinite periodic surface is modelled by a unit cell FE model with cyclic symmetric boundary conditions, allowing the model to be small, and elastic wave scattering from the surface is simulated in the time domain. This cell model is demonstrated using the commercial FE package ABAQUS and examples of the scattered wave results are compared with large FE model results.
- Rough surfaces
- Finite element methods
- Surface scattering
- Ultrasonic scattering
- Boundary value problems
Daniel Baumann, Mark G. Jackson, Peter Adshead, Alexandre Amblard, Amjad Ashoorioon, Nicola Bartolo, Rachel Bean, Maria Beltrán, Francesco de Bernardis, Simeon Bird, Xingang Chen, Daniel J. H. Chung, Loris Colombo, Asantha Cooray, Paolo Creminelli, Scott Dodelson, Joanna Dunkley, Cora Dvorkin, Richard Easther, Fabio Finelli, Raphael Flauger, Mark P. Hertzberg, Katherine Jones‐Smith, Shamit Kachru, Kenji Kadota, Justin Khoury, William H. Kinney, Eiichiro Komatsu, Lawrence M. Krauss, Julien Lesgourgues, Andrew Liddle, Michele Liguori, Eugene Lim, Andrei Linde, Sabino Matarrese, Harsh Mathur, Liam McAllister, Alessandro Melchiorri, Alberto Nicolis, Luca Pagano, Hiranya V. Peiris, Marco Peloso, Levon Pogosian, Elena Pierpaoli, Antonio Riotto, Uroš Seljak, Leonardo Senatore, Sarah Shandera, Eva Silverstein, Tristan Smith, Pascal Vaudrevange, Licia Verde, Ben Wandelt, David Wands, Scott Watson, Mark Wyman, Amit Yadav, Wessel Valkenburg and Matias Zaldarriaga
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