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Ultrasonic propagation in finite-length granular chains

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Hutchins, David A., Yang, Jia, Akanji, Omololu, Thomas, P. J. (Peter J.), Davis, Lee A. J., Freear, Steven, Harput, Sevan, Saffari, Nader‏ and Gelat, Pierre (2016) Ultrasonic propagation in finite-length granular chains. Ultrasonics, 69 . pp. 215-223. doi:10.1016/j.ultras.2015.10.018

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Official URL: http://dx.doi.org/10.1016/j.ultras.2015.10.018

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Abstract

A narrowband ultrasound source has been used to generate solitary wave impulses in finite-length chains of spheres. Once the input signal is of sufficient amplitude, both harmonics and sub-harmonics of the input frequency can be generated as non-linear normal modes of the system, allowing a train of impulses to be established from a sinusoidal input. The characteristics of the response have been studied as a function of the physical properties of the chain, the input waveform and the level of static pre-compression. The results agree with the predictions of a theoretical model, based on a set of discrete dynamic equations for the spheres for finite-length chains. Impulses are only created for very small pre-compression forces of the order of 0.01 N, where strongly non-linear behaviour is expected.

Item Type: Journal Article
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Science, Engineering and Medicine > Engineering > Engineering
Library of Congress Subject Headings (LCSH): Ultrasonic testing, Granular materials, Discrete-time systems, Nondestructive testing
Journal or Publication Title: Ultrasonics
Publisher: Elsevier Science BV
ISSN: 0041-624X
Official Date: July 2016
Dates:
DateEvent
July 2016Published
2 November 2015Available
19 October 2015Accepted
26 August 2015Submitted
Volume: 69
Page Range: pp. 215-223
DOI: 10.1016/j.ultras.2015.10.018
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access
Funder: Engineering and Physical Sciences Research Council (EPSRC)
Grant number: EPK030159

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