Experimental Mechanics

, Volume 49, Issue 4, pp 551–559 | Cite as

Study of a Crack at a Fastener Hole by Digital Image Correlation

  • P. López-Crespo
  • R. L. Burguete
  • E. A. Patterson
  • A. Shterenlikht
  • P. J. Withers
  • J. R. Yates
Article

Abstract

In this work the efficacy of using digital image correlation to determine stress intensity factors for a crack emanating from a fastener hole has been investigated. To this end a fatigue crack was grown in pure mode I from a 50 mm diameter hole in an Al 7010 alloy plate test-piece. This crack was then loaded elastically under several combinations of mixed mode (I + II) displacements. In each case, images of the sample surface before and after the deformation were recorded using a high resolution digital camera. The surface preparation consisted only of scratching the surface lightly with silicon carbide abrasive paper. The crack location and resulting displacements were then calculated using digital image correlation. The analytical displacement fields for a traction free crack under arbitrary loading conditions based on the Muskhelishvili’s complex function approach were fitted to the experimentally measured displacement fields and the mixed mode stress intensity factor was determined in each case. Good agreement with the nominal applied values was obtained. The uncertainty of the crack tip position has a major influence on the accuracy of the stress intensity factors and so the Sobel edge finding filter was successfully applied to experimental displacement fields to establish precisely the crack tip location.

Keywords

Image correlation Crack Fastener hole SIF Fatigue crack 

Notes

Acknowledgements

The authors would like to acknowledge financial support from the Engineering and Physical Sciences Research Council (EPSRC), UK, through grants no. GR/S18038/01 and GR/S18045/01.

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Copyright information

© Society for Experimental Mechanics 2008

Authors and Affiliations

  • P. López-Crespo
    • 1
  • R. L. Burguete
    • 2
  • E. A. Patterson
    • 3
  • A. Shterenlikht
    • 4
  • P. J. Withers
    • 4
  • J. R. Yates
    • 1
  1. 1.Department of Mechanical EngineeringUniversity of SheffieldSheffieldUK
  2. 2.Airbus UKBristolUK
  3. 3.Department of Mechanical EngineeringMichigan State UniversityEast LansingUSA
  4. 4.Materials Science CentreManchester UniversityManchesterUK

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