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Defect Characterization in Thick Composites by Ultrasound

  • David K. Hsu
  • Ali Minachi
Chapter
Part of the Review of Progress in Quantitative Nondestructive Evaluation book series

Abstract

In today’s application of composites, thick composites are beginning to be used for load bearing structural members. The nondestructive evaluation of composites relies heavily on ultrasound as the probing field, but the ultrasonic NDE of thick composites poses new challenges. First, to penetrate a large thickness of composite one must use ultrasound of low frequencies, but the long wavelengths at low frequencies afford only poor resolution. Secondly, with increasing thickness, the anisotropy of the material assumes a greater importance and certain simplifying assumptions acceptable in thin composites are no longer valid. Moreover, in pulsed ultrasonic measurement of thick composites, the high total attenuation associated with the large thickness and its frequency dependence often changes the spectral content of the pulses considerably [1].

Keywords

Flaw Size Ultrasonic Pulse Void Content Ultrasonic Attenuation Distance Curve 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    W. J. Murri and B. W. Sermon, “NDE of Thick Graphite/Epoxy Composites: Some Approaches and Problems”, Review of Progress in Quantitative NDE, Vol. 8, edited by D. O. Thompson and D. E. Chimenti, ( Plenum, New York, 1989 ). pp. 1511–1518.Google Scholar
  2. 2.
    D. K. Hsu and S. M. Nair, “Evaluation of Porosity in Graphite Epoxy Composites by Frequency Dependence of Ultrasonic Attenuation”, Review of Progress in Quantitative NDE, Vol. 6, edited by D. 0. Thompson and D. E. Chimenti, ( Plenum, New York, 1987 ). pp. 1185–1193.Google Scholar
  3. 3.
    D. K. Hsu, “Quantitative Evaluation of CFRP Void Content using Ultrasonic Attenuation and Velocity”, Fourth Japan-U. S. Conference on Composite Materials, Washington, D. C., June 27–30, 1988.Google Scholar
  4. 4.
    F. J. Margetan, T. A. Gray, R. B. Thompson, and B. P. Newberry, “A Model for Ultrasound Transmission Through Graphite Composite Plates Containing Delaminations”, Review of Progress in Quantitative NDE, Vol. 7, edited by D. O. Thompson and D. E. Chimenti, ( Plenum, New York, 1988 ). pp. 1083–1092.Google Scholar
  5. 5.
    F. J. Margetan, B. P. Newberry, T. A. Gray and R. B. Thompson, “Modeling Ultrasonic Beam Propagation in Graphite Composites”, Review of Progress in Quantitative NDE, Vol. 8, edited by D. O. Thompson and D. E. Chimenti, ( Plenum, New York, 1989 ). pp. 157–164.Google Scholar

Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • David K. Hsu
    • 1
  • Ali Minachi
    • 1
  1. 1.Center for NDEIowa State UniversityAmesUSA

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