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Eddy Current Inspection of Graphite-Epoxy Solid Rocket Motor Canisters

  • Stephen S. Lane
  • R. J. Churchill
  • H. P. Groger
Chapter
Part of the Review of Progress in Quantitative Nondestructive Evaluation book series

Abstract

Filament wound graphite/epoxy cylinders are used in a number of applications because of their favorable strength-to-weight ratio. Eddy current techniques are receiving more attention for composite inspection because eddy currents detect broken fibers but not delaminations. Therefore, eddy current inspection of this material would be desirable in its own right and as an adjunct to ultrasonic inspection which detects delaminations, but not broken fibers. However, filament wound graphite/epoxy is difficult to inspect because of its large and anisotropie electrical resistivity. This paper presents a technique for eddy current NDI of filament wound graphite/epoxy which uses currents flowing in the low-resistivity circumferential direction. This method eliminates several objections to conventional eddy current inspection of this material.

Keywords

Break Fiber Pickup Coil Ultrasonic Inspection Filament Wound Anisotropic Resistivity 
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.
    Vernon, S., “Eddy Current Nondestructive Inspection of Graphite/Epoxy Using Ferrite Cup Core Probes,” NSWC TR 87–148, Naval Surface Warfare Center, White Oak, MD 20903–5000Google Scholar
  2. 2.
    Churchill, R. J., Lane, S. S., Moore, R. H. and Groger, H. P., “Characterization of Damage in Composite Rocket Motor Canisters,” Final Report, U. S. Navy, Naval Weapons Center, China Lake, California, Contract No. N65030–87-C-0177, June 1989.Google Scholar

Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • Stephen S. Lane
    • 1
  • R. J. Churchill
    • 1
  • H. P. Groger
    • 1
  1. 1.American Research Corporation of VirginiaRadfordUSA

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