Model-Based Iterative Flaw Sizing for Thick Composites

  • Ali Minachi
  • David K. Hsu


Ultrasonic inspection of thick composites has been plagued by many problems such as the high degree of anisotropy and difficulties in achieving sufficient signal penetration. The dependency of wave speed to propagation direction causes beam skewing and excess beam divergence in certain directions, leading in turn to distortion of beam profile. Consequently, the beam distortion generates false indication of size and location of a flaw. This distortion of the beam in thick composites depends on several factors such as fiber layout of the material, size and frequency of the transducer used, etc.


Displacement Field Beam Profile Apparent Size Ultrasonic Beam Ultrasonic Inspection 
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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  1. 1.
    D. K. Hsu and A. Minachi, “Defect Characterization in Thick Composites by Ultrasound”, Review of Progress in Quantitative NDE, Vol. 9. D. O. Thompson and D. E. Chimenti (Plenum, New York, 1990), pp. 1481–1488.Google Scholar
  2. 2.
    B. P. Newberry and R. B. Thompson, “A Paraxial Theory for the Propagation of Ultrasonic Beam in Anisotropic Solids”, J. Acoust. Soc. Amer. 85, pp. 2290–2300.Google Scholar
  3. 3.
    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, D. O. Thompson and D. E. Chimenti (Plenum, New York, 1989), pp. 157–164.Google Scholar

Copyright information

© Plenum Press, New York 1991

Authors and Affiliations

  • Ali Minachi
    • 1
  • David K. Hsu
    • 1
  1. 1.Center for NDE, Department of Aerospace Engineering and Engineering MechanicsIowa State UniversityAmesUSA

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