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Acoustic anisotropy and birefringence in fibre-reinforced composite materials

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Abstract

All nine elastic moduli of an orthotropic composite material, namely, polypropylene reinforced with glass fiber, are determined from the measured values of the bulk acoustic wave velocities along specific directions in the planes of symmetry of the material. These data are used to calculate the angular dependences of phase velocities, polarization vectors, and directions of ray velocities of bulk waves in the composite. It is demonstrated that the difference in the velocities of shear waves polarized along and across the glass fiber gives rise to an acoustic birefringence and can lead to an elliptical polarization of waves. The measurement of the phase velocities of shear waves as functions of the wave polarization is suggested as a method for the determination of the fiber orientation in a composite material.

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Authors and Affiliations

  1. Department of Nondestructive Testing, Institute for Polymer Testing and Science, Stuttgart University, Pfaffenwaldring 32, Stuttgart, 70563, Germany

    G. Busse, R. Stoessel & J. Schuetz

  2. Department of Physics, Moscow State University, Vorob’evy gory, Moscow, 119899, Russia

    I. Yu. Solodov

Authors
  1. G. Busse
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  2. I. Yu. Solodov
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  3. R. Stoessel
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  4. J. Schuetz
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Translated from Akusticheski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Zhurnal, Vol. 48, No. 1, 2002, pp. 22–27.

Original Russian Text Copyright © 2002 by Busse, Solodov, Stoessel, Schuetz.

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Busse, G., Solodov, I.Y., Stoessel, R. et al. Acoustic anisotropy and birefringence in fibre-reinforced composite materials. Acoust. Phys. 48, 18–23 (2002). https://doi.org/10.1134/1.1435384

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  • DOI: https://doi.org/10.1134/1.1435384

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