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IN-SITU OPTICAL CRACK MEASUREMENT USING A DOT PATTERN

  • US 20110106459A1
  • Filed: 10/29/2009
  • Published: 05/05/2011
  • Est. Priority Date: 10/29/2009
  • Status: Abandoned Application
First Claim
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1. A method of detecting cracks in an object, the method comprising:

  • capturing a first image of a pattern of marks in a region of interest on a surface of the object;

    constructing a finite element model of the region of interest having nodes corresponding to the marks in the pattern;

    subjecting the object to a first mechanical load to produce strains in the object;

    capturing a second image of the pattern;

    computing strains in the object based on relative changes in locations of the marks in the first and second images;

    modifying the finite element model to produce a crack versus surface strain map;

    capturing a third image of the pattern; and

    comparing the locations of marks in the third image to the crack versus surface strain map to identify a crack in the object.

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