Synthetic Tridimensionnal Representation of Slowness Surfaces of Anisotropic Materials
The traditional bidimensionnal representation of the characteristics of the polarisation and slowness curves for the ultrasonic waves propagating within anisotropic media is well known but does not permit a global approach of the phenomena encountered during propagation of ultrasonic beams. We established that a tridimensionnal classification of the waves by the slowness was preferable rather than by the polarisations in order to better understand the evolution of the three waves with propagation direction. The representation of the polarisation by vector fields which is easy in bidimensionnal plots is no more convenient in tridimensionnal analysis. A method based upon a colour coding according to the decomposition of the polarisation vector on a local spherical basis is proposed. A simple criterion is chosen: red for the longitudinal polarisation, green for the vertical shear polarisation and blue for the horizontal shear polarisation. The quasi-longitudinal waves and the quasi-shear waves are characterised by mixed colours. The method is applied to three different media.
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Document Type: Research Article
Publication date: November 1, 1998
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- Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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