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Thermal Diffusivity Measurements on Composite Porosity Samples

  • Joseph N. Zalameda
  • William P. Winfree
Chapter
Part of the Review of Progress in Quantitative Nondestructive Evaluation book series

Abstract

Porosity is a defect which can arise from moisture or gases being introduced to the resin system before cure and also during the curing process when poor bagging techniques are used. The effect of porosity results in a degradation in compressive, transverse tensile, and interlaminar shear strengths. For example, for a 1% porosity level there is approximately a 7% decrease in the interlaminar shear strength [1]. Ultrasonics is the current state of the art NDE method for the characterization of porosity in composites using the back scatter and frequency dependent attenuation measurements. In this work a thermal diffusivity technique is investigated for the characterization of porosity in graphite composite parts. The advantages of using thermal techniques is the noncontacting nature of the measurements and the ability to capture large areas using a thermal imager.

Keywords

Porosity Level Spherical Void Electrical Analog Pyroelectric Detector Thermal Diffusivity Measurement 
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

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    N. Judd, W. Wright, SAMPE Journal January/February, pp. 10–14 (1978).Google Scholar
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    A. Hirschman, J. Dennis, W. Derksen, T. Monahan, International Developments in Heat Transfer, ASME, Part IV, pp. 863–869.Google Scholar
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    F. Incropera, P. Dewitt, Fundamentals of Heat Transfer (John Wiley and Sons, Inc., 1981 ).Google Scholar
  4. 4.
    H. Carslaw, J Jeager, Conduction of Heat in Solids, (Oxford University Press, 1959 ).Google Scholar

Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • Joseph N. Zalameda
    • 1
  • William P. Winfree
    • 2
  1. 1.US Army Aviation Research and Technology Activity - AVSCOM MS 231Langley Research CenterHamptonUSA
  2. 2.NASA MS231Langley Research CenterHamptonUSA

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