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Sound Velocity Dependence on Strain for Damaged Steel
Responsible organisation
2008 (English)Conference paper, (Refereed) Published
Abstract [en]

When making acoustic measurements on materials with cracks, there exist two types of behavior that influence the sound velocity monitored through the resonance frequency of the object. One is the material's nonlinearity, and the other is a slow recovery process of the material parameters towards equilibrium called Slow Dynamics. The former is a wave distortion taking place in the presence of the wave while the latter is a slow recovery process that makes the time history of the material state count. For the understanding of the dynamics of these solids it is necessary to be able to separate the effects of nonlinearity and slow dynamics. In this work, this has been accomplished by making measurements on steel at steady-state through keeping the strain constant. Normal frequency sweeps at different strains are compared to constant strain sweeps. As every material state parameter can induce a slow dynamic response it is important to keep control of humidity and temperature. Measurements performed at different temperatures give different results. An example of this is the presented resonance frequency plots for the temperatures 20, 25 and 30 degrees Celcius. © 2008 American Institute of Physics.

Place, publisher, year, edition, pages
Stockholm: American Institute of Physics , 2008.
Keyword [en]
Amplitude dependence, Non-equilibrium dynamics of solids, Nonlinear sound velocity dependence, Slow dynamics, Temperature dependence
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:bth-8349ISI: 000257236700063Local ID: oai:bth.se:forskinfo8AA9CFA1A93658E8C125750400552B96ISBN: 978-0-7354-0544-8 (print)OAI: oai:DiVA.org:bth-8349DiVA: diva2:836059
Conference
18th International Symposium on Nonlinear Acoustics
Available from: 2012-09-18 Created: 2008-11-17 Last updated: 2015-06-30Bibliographically approved

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