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The Elastic Moduli of Thick Composites

  • E. P. Papadakis
  • T. Patton
  • Y.-M. Tsai
  • D. O. Thompson
Chapter
Part of the Review of Progress in Quantitative Nondestructive Evaluation book series

Abstract

Thick composites are in use in critical applications and are proposed for still others. It is important to measure the elastic moduli of thick composites for two reasons: (1) for design data on stiffness, and (2) for prediction of feasible wave paths for ultrasonic waves for NDE. Previously only relatively thin composites of relatively simple symmetries have been measured for their elastic moduli. Now, it is becoming necessary to measure thick composites of feasible engineering lay-ups. These generally provide the complexity of orthorhombic symmetry locally in a specimen combined with curvature in the gross structure. In this work, specimens cut from thick structures will be treated in the same way as crystals to measure the elastic moduli by means of ultrasonic wave velocities. Results on one structure will be presented. Difficulties will be analyzed.

Keywords

Elastic Modulo Ultrasonic Velocity Orthorhombic Symmetry Ultrasonic Wave Velocity Plane Wave Propagation 
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.
    H. Kolsky, Stress Waves in Solids, Dover Publications, New York, 1963, pp. 33–40.Google Scholar
  2. 2.
    E. P. Papadakis and H. Bernstein, “Elastic Moduli of Pyrolytic Graphite”, J. Acoust. Soc. Amer. 35, 521–524 (1963).CrossRefGoogle Scholar
  3. 3.
    W. Murri, Hercules Aerospace Co., private communication.Google Scholar
  4. 4.
    E. P. Papadakis and B. W. Petersen, “Ultrasonic Velocity as a Predictor of Density in Sintered Powder Metal Parts”, Materials Evaluation 37 (5), 76–80 (1979).Google Scholar

Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • E. P. Papadakis
    • 1
  • T. Patton
    • 1
  • Y.-M. Tsai
    • 1
  • D. O. Thompson
    • 1
  1. 1.Center for Nondestructive EvaluationIowa State UniversityAmesUSA

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