Multi-Parameter, Multi-Frequency Acousto-Ultrasonic for Detecting Impact Damage in Composites

  • James R. Mitchell

Abstract

The inability to detect impact damage in composite material structures is a major factor blocking more extensive use of these materials. Past research utilizing a simplistic measurement of AU has indicated great potential when used in a laboratory environment. The use of AU outside of the laboratory by non-scientists has not met with the same success. This report describes the use of a more complicated approach to AU which incorporates several parameters measured simultaneously. The result is a technique, called “DCAT” (Dry Contact Acoustic Transmission; Patent Pending), which can be utilized to locate impact damage in non-laboratory environments.

Keywords

Acoustic Emission Stress Wave Carbon Fiber Reinforce Plastic Impact Damage Composite Material Structure 
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.
    A. Vary and R. F. Clark, “Correlation of Fiber Composite Tensile Strength with the Ultrasonic Stress Wave Factor, TM-78846,” NASA, Cleveland (1978).Google Scholar
  2. 2.
    “Standard Definitions of Terms Relating to Acoustic Emission, ASTM E610,” American Society for Testing and Materials, Baltimore (1986).Google Scholar
  3. 3.
    A. Govada, J. C. Duke, Jr., E. G. Henneke, II, and W. W. Stinchcomb, “A Study of the Stress Wave Factor Technique for the Characterization of Composite Materials, CR-174870,” NASA, Cleveland (1985).Google Scholar
  4. 4.
    J. R. Mitchell, and R. K. Miller, Acousto-Ultrasonics Principles and Application, in: “Proceedings of the Second International Symposium on Acoustic Emission from Composites,” Society of Plastics Industry, New York (1986).Google Scholar
  5. 5.
    D. E. W. Stone, and B. Clark, Ultrasonic Attenuation as a Measure of Void Content in Carbon Fiber Reinforced Plastics, NDT. 8 (1975).Google Scholar
  6. 6.
    A. Vary, Concepts and Techniques for Ultrasonic Evaluation of Material Mechanical Properties, in: “Mechanics of Nondestructive Testing,” W. W. Stinchcomb, ed., Plenum Press, New York (1980).Google Scholar
  7. 7.
    A. Vary and K. J. Bowles, “Use of Ultrasonic-Acoustic Technique for Nondestructive Evaluation of Fiber Composite Strength, TM-73813,” NASA, Cleveland (1978).Google Scholar
  8. 8.
    A. Vary and K. J. Bowles, “Ultrasonic Evaluation of the Strength of Unidirectional Graphite-Polyimide Composites, TM-X-73646,” NASA, Cleveland (1977).Google Scholar
  9. 9.
    D. R. Hull and A. Vary, “Interrelation of Material Microstructure, Ultrasonic Factors, and Fracture Toughness of a Two Phase Titanium Alloy, TM-82810,” NASA, Cleveland (1982).Google Scholar
  10. 10.
    J. H. Williams and N. R. Lampert, “Ultrasonic Evaluation of Impact Damaged Graphite Fiber Composites,” Matls Eval. 38 (1980).Google Scholar
  11. 11.
    E. G. Henneke, II, J. C. Duke, Jr., W. W. Stinchcomb, A. K. Govada, and A. Lemascon, “A Study of the Stress Wave Factor Technique for the Characterization of Composite Materials, CR-3670,” NASA, Cleveland (1984).Google Scholar
  12. 12.
    J. C. Duke, Jr, E. G. Henneke, II, W. W. Stinchcomb, and K. L. Reifsnider, Characterization of Composite Materials by Means of the Ultrasonic Stress Wave Factor, in: “Composite Structures 2,” I. H. Marshall, ed., Applied Scientific Publications, London (1983).Google Scholar

Copyright information

© Springer Science+Business Media New York 1988

Authors and Affiliations

  • James R. Mitchell
    • 1
  1. 1.Physical Acoustics CorporationLawrencevilleUSA

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