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11 June 2002 Ultrasonic waves in an open cell foam
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This paper is concerned with the nondestructive materials and defects characterization of foams using ultrasonics. Propagation of ultrasonic waves in a thick plate made out of highly porous, open cell, carbon foam is studied in an effort to understand their relationship with the elastic properties of the material. The foam is assumed to have a tetrakaidecahedral structure and its geometric and overall elastic properties are determined from microscopic data and wave propagation experiments. A simple, one-dimensional model, based on a periodic spring-mass system is proposed for propagation in the through-thickness direction. Due to the difficulty in performing experiments under dry coupling conditions, ultrasonic experiments were carried out with the foam immersed in fluid in a test bed. The wave speed in the fluid filled foam is calculated after obtaining the average elastic moduli of the fluid saturated medium. The calculated wave speed is found to be in good agreement with that measured in the experiment. Significant discontinuities within the plate are also detected through ultrasonic and radiographic experiments. The present models can be employed effectively to characterize any open-cell foam.
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Ajit K. Mal, Sauvik Banerjee, and Darren Rogers "Ultrasonic waves in an open cell foam", Proc. SPIE 4702, Smart Nondestructive Evaluation for Health Monitoring of Structural and Biological Systems, (11 June 2002);

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