A one-dimensional theoretical model is developed to predict the acoustic waves generated by rapid thermal expansion caused by electromagnetic microwave absorption in viscoelastic rods. The theoretical acceleration at the end of the irradiated rod is predicted. The comparison between the experimental and the theoretical accelerations leads to the evaluation of viscoelastic characteristics. Parameters related to the electromagnetic absorption can be also obtained. A procedure to find approximate values of the different parameters is developed. Since it is considered in the model that the distribution of the temperature rise along the rod is exponential, very absorbing materials can be tested. Consequently, the influence of the moisture content on viscoelastic properties of a porous material can be investigated. The method is applied to study the influence of the moisture content on viscoelastic characteristics of medium density fiberboard materials.
An Acoustic-Microwave Method for the Study of the Mechanical Influence of Moisture Content in Materials
Contributed by the Applied Mechanics Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF APPLIED MECHANICS. Manuscript received by the Applied Mechanics Division, July 18, 2000; final revision, Aug. 1, 2002. Associate Editor: V. K. Kinra. Discussion on the paper should be addressed to the Editor, Prof. Robert M. McMeeking, Chair, Department of Mechanics and Environmental Engineering, University of California–Santa Barbara, Santa Barbara, CA 93106-5070, and will be accepted until four months after final publication in the paper itself in the ASME JOURNAL OF APPLIED MECHANICS.
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Bacon , C., Guilliorit , E., and Hosten, B. (March 27, 2003). "An Acoustic-Microwave Method for the Study of the Mechanical Influence of Moisture Content in Materials ." ASME. J. Appl. Mech. March 2003; 70(2): 268–274. https://doi.org/10.1115/1.1545783
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