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Evaluation of Sensitivity of Ultrasonic Detection of Delaminations in Graphite/Epoxy Laminates

  • S. W. Schramm
  • I. M. Daniel
  • W. G. Hamilton

Abstract

A study was conducted to evaluate, improve and optimize ultrasonic techniques for the detection of tight delaminations in composite laminates. Four graphite/epoxy panels were investigated using matched pairs of compression and shear wave ultrasonic transducers of three frequencies (1, 2.25 and 5MHz). Pulse echo and through transmission modes were used and A-scans, C-scans and frequency spectra were analyzed. It was found that the higher frequency (5MHz) compression transducer operated in the pulse-echo mode gave the best results in most cases. Shear wave transducers were found to be cumbersome to use and unsuitable for the cases studied.

Keywords

Composite Laminate Compressive Wave Ultrasonic Transducer Specimen Type 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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Copyright information

© Plenum Press, New York 1980

Authors and Affiliations

  • S. W. Schramm
    • 1
  • I. M. Daniel
    • 1
  • W. G. Hamilton
    • 1
  1. 1.Materials Technology DivisionIIT Research InstituteChicagoUSA

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