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

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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.

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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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Author notes

  1. A. Shterenlikht

    Present address: Department of Mechanical Engineering, University of Bristol, University Walk, Bristol, BS8 1TR, UK

Authors and Affiliations

  1. Department of Mechanical Engineering, University of Sheffield, Mappin Street, Sheffield, S1 3JD, UK

    P. López-Crespo & J. R. Yates

  2. Airbus UK, New Filton House, Filton, Bristol, BS99 7AR, UK

    R. L. Burguete

  3. Department of Mechanical Engineering, Michigan State University, 2555 Engineering Building, East Lansing, MI, 48824-1226, USA

    E. A. Patterson

  4. Materials Science Centre, Manchester University, Grosvenor Street, Manchester, M1 7HS, UK

    A. Shterenlikht & P. J. Withers

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  1. P. López-Crespo
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  2. R. L. Burguete
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  3. E. A. Patterson
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  4. A. Shterenlikht
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  5. P. J. Withers
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  6. J. R. Yates
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Correspondence to E. A. Patterson.

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López-Crespo, P., Burguete, R.L., Patterson, E.A. et al. Study of a Crack at a Fastener Hole by Digital Image Correlation. Exp Mech 49, 551–559 (2009). https://doi.org/10.1007/s11340-008-9161-1

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  • DOI: https://doi.org/10.1007/s11340-008-9161-1

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