Novel Approaches for the Ultrasonic NDE of Thick and other Composites

  • Wolfgang Sachse
  • Kwang Yul Kim


This paper summarizes several recent developments which are facilitating new approaches for both active and passive quantitative ultrasonic measurements in composite materials. These include the development of point sources and point receivers, a theory for analyzing the propagation of transient elastic waves through a bounded, dispersive and attenuative medium, and the development and implementation of appropriate signal processing algorithms. An alternative to these deterministic approaches is a processing scheme based on a simulated intelligent system which processes the signals like a neural network. Examples of applications of these ideas to the NDE of composite materials are shown.


Ultrasonic Signal Pattern Vector Viscoelastic Plate Quantitative Nondestructive Evaluation Transient Elastic Wave 
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.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    W. Sachse and K. Y. Kim, Ultrasonics, 25, 195–203 (1987).CrossRefGoogle Scholar
  2. 2.
    W. Sachse and K. Y. Kim, “Point-source/Point-receiver materials testing”, in Review of Quantitative Nondestructive Evaluation, 6A, D. O. Thompson and D. E. Chimenti, Eds., Plenum Press, New York (1986), pp. 311–320.Google Scholar
  3. 3.
    W. Sachse, “Transducer considerations for point-source/point-receiver materials measurements”, in Ultrasonics International ’87: Conference Proceedings, Butterworth Scientific, Ltd., Guildford, Surrey, UK (1987), pp. 495–501.Google Scholar
  4. 4.
    B. Castagnede and W. Sachse, “Optimized determination of elastic constants of anisotropic solids from wavespeed measurements”. This volume.Google Scholar
  5. 5.
    R. L. Weaver and W. Sachse, “Asymptotic viscoelastic rays in a thick plate”, T&AM Preprint (June 1988). Submitted to: Journal of Applied Mechanics.Google Scholar
  6. 6.
    R. L. Weaver, W. Sachse and L. Niu, “Transient ultrasonic waves in a viscoelastic plate: I. Theory; II. Applications to materials characterization”, Materials Science Center Reports #6504; #6505 (July 1988). Submitted to: J. Acoust. Soc. Am. Google Scholar
  7. 7.
    I. Grabec and W. Sachse, “Experimental Characterization of ultrasonic phenomena by a learning system”, MSC Report #6447, Ithaca, NY (April 1988). (Submitted for publication).Google Scholar
  8. 8.
    I. Grabec and W. Sachse, “Application of an intelligent signal processing system to AE analysis”, MSC Report #6428, Ithaca, NY (April 1988). In Press: J. Acoust. Soc. Am. Google Scholar
  9. 9.
    I. Grabec and W. Sachse, “Experimental characterization of ultrasonic phenomena by a neural-like learning system”. This volume.Google Scholar
  10. 10.
    T. Kohonen, “State of the art in neural computing”, Proc. Intl. Conf. Neural Networks, San Diego, CA (1987), pp. 1–77.Google Scholar
  11. 11.
    T. Kohonen, Neural Networks, 1, 3–16 (1988).CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1989

Authors and Affiliations

  • Wolfgang Sachse
    • 1
  • Kwang Yul Kim
    • 1
  1. 1.Department of Theoretical and Applied MechanicsCornell UniversityIthacaUSA

Personalised recommendations