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Deflection dynamics of rock beam caused by ultrasound
Blekinge Institute of Technology, School of Engineering, Department of Mathematics and Natural Sciences.
Blekinge Institute of Technology, School of Engineering, Department of Mathematics and Natural Sciences.
2013 (English)In: Mechanics of time-dependant materials, ISSN 1385-2000, E-ISSN 1573-2738, Vol. 17, no 4, 597-604 p.Article in journal (Refereed) Published
Abstract [en]

A new method for monitoring the time dependent dynamics of materials is proposed and implemented. By completely separating the conditioning (here ultrasound), the probing (here gravity), and the material state indicator (here deflection), the details of this dynamic process becomes apparent. The method allows both continuous monitoring of the material state without cross-interaction by the measuring process on the results, as well as complete freedom of conditioning and probing. It was successfully tested for sensitivity and repeatability when applied on a horizontally suspended beam of gabbro rock, which was observed to sag when subjected to ultrasound. These introductory tests have given new insights. The beam rises back, against the force of gravity, after the ultrasound is turned off. The deflection motions are fast both at the onset and at the termination of ultrasound, with the subsequent continuations being much slower. This new method is able to provide the higher accuracy needed for the advancement of the theoretical framework for material property time dependent dynamics.

Place, publisher, year, edition, pages
Springer , 2013. Vol. 17, no 4, 597-604 p.
Keyword [en]
Non-equilibrium dynamics, Nonlinear acoustics, Nonlinear elasticity, Slow dynamics
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:bth-6785DOI: 10.1007/s11043-012-9207-8ISI: 000327862300006Local ID: oai:bth.se:forskinfo3203D871C6B6803DC1257B9B0034E4C2OAI: oai:DiVA.org:bth-6785DiVA: diva2:834331
Available from: 2014-01-07 Created: 2013-07-01 Last updated: 2016-09-07Bibliographically approved

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Hedberg, ClaesHaller, Kristian
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Department of Mathematics and Natural Sciences
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