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Intrumented patch for repair of fatigue damaged or sensitive structure

  • US 5,553,504 A
  • Filed: 10/19/1995
  • Issued: 09/10/1996
  • Est. Priority Date: 11/23/1993
  • Status: Expired due to Fees
First Claim
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1. An apparatus for preventing and detecting formation or propagation of a crack in a structural member, said apparatus comprising:

  • a patch, adapted to be fixed to a surface of a structural member, which forms a means for reducing stress levels in a patch-covered area on the surface of the member by bearing a substantial portion of a load on said surface; and

    strain-sensing means integrally formed with said patch for sensing a strain field in a fatigue sensitive region within the patch-covered area, said strain-sensing means providing a signal indicative of changes in the strain field in said fatigue sensitive region.

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