Theory and Application

  • John C. DukeJr.

Table of contents

  1. Front Matter
    Pages i-ix
  2. Keynote

    1. Alex Vary
      Pages 1-21
  3. Theory — Wave Propagation for Acousto-Ultrasound

    1. Adnan H. Nayfeh, Timothy W. Taylor
      Pages 23-34
    2. R. L. Weaver
      Pages 35-43
    3. B. Tang, E. G. Henneke II, R. C. Stiffler
      Pages 45-65
    4. A. Pilarski, J. L. Rose, K. Balasubramaniam, J. Da-Le
      Pages 79-91
  4. Data Interpretation

  5. Sources/Detectors

    1. A. Sarrafzadeh, R. J. Churchill, M. G. Niimura
      Pages 201-207
    2. Richard O. Claus, J. A. Wiencko, R. E. Rogers
      Pages 239-246
  6. Calibration and Method Implementation

  7. Applications — General

    1. Marcia Patton-Mallory, Kent D. Anderson
      Pages 301-303
    2. Avraham Mittelman, Itzhak Roman, Arye Bivas, Isaac Leichter, Joseph Y. Margulies, Arie Weinreb
      Pages 305-309
  8. Applications — Composite Materials

  9. Applications — Bonding

  10. Back Matter
    Pages 351-353

About this book


Finding and slzmg cracks and other crack-like discontinuities has been the center of attention for scientists and engineers developing and using nondestructive evaluation (NDE) technology. However, with advanced mate­ rials being "engineered" and used in critical structural components, a new for NDE has emerged. Whereas many traditional engineering materi­ challenge als fail due to the initiation and self-similar propagation of a crack, reinforced composite materials degrade and fail in a manner more analogously to the collapse of a structure. Consequently the NDE of such materials involves assessing the combined effect of the material's damaged condition rather than identifying and sizing single critical imperfection. In 1979 Alex Vary, seeking to address the challenge confronting the NDE of advanced fiber reinforced composite materials began work on a new method of materials characterization. Focusing on the problem of evaluating graphite fiber reinforcedl epoxy laminated plates; Vary used a piezoelectric transducer to excite a mechanical disturbance in a plate and, with a sensi­ tive piezoelectric transducer monitored the disturbance on the same surface of the plate. (Placing the transducers on the same surface was primarily for practical purpose but their displacement in the direction of anticipated service load was of fundamental significance!) To quantify this observation, he counted the number of excursions, of the resulting electrical signal, above a arbitrary voltage threshold; a procedure frequently used for acoustic emission signal analysis.


cement cracks damage engine glass laser materials materials characterization scattering sensors service structure surface technology transducer

Editors and affiliations

  • John C. DukeJr.
    • 1
  1. 1.Virginia Polytechnic Institute and State UniversityBlacksburgUSA

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