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Improvement of the Contour Method for Measurement of Near-Surface Residual Stresses from Laser Peening

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Abstract

A study was conducted to develop a methodology to obtain near-surface residual stresses for laser-peened aluminium alloy samples using the contour method. After cutting trials to determine the optimal cut parameters, surface contours were obtained and a new data analysis method based on spline smoothing was applied. A new criterion for determining the optimal smoothing parameters is introduced. Near-surface residual stresses obtained from the contour method were compared with X-ray diffraction and incremental hole drilling results. It is concluded that with optimal cutting parameters and data analysis, reliable near-surface residual stresses can be obtained by the contour method.

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Acknowledgments

The authors would like to acknowledge Dr Greg Johnson and Dr Mark Turski for their Matlab scripts, some of which were used in this work. Special thanks to EADS IW for the samples. Very special thanks to Peter Ledgard at The Open University for cutting trials and the actual cut. Dr Mike Prime is also acknowledged for useful discussions. MEF is supported by the Lloyd's Register Foundation, which supports the advancement of engineering-related education, and funds research and development that enhances safety of life at sea, on land and in the air.

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  1. M. B. Toparli

    Present address: Defense Industries Research and Development Institute (TÜBİTAK SAGE), P.K. 16, 06261, Mamak, Ankara, Turkey

Authors and Affiliations

  1. Materials Engineering, The Open University, Walton Hall, Milton Keynes, MK7 6AA, UK

    M. B. Toparli, M. E. Fitzpatrick & S. Gungor

Authors
  1. M. B. Toparli
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  2. M. E. Fitzpatrick
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  3. S. Gungor
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Correspondence to M. E. Fitzpatrick.

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Toparli, M.B., Fitzpatrick, M.E. & Gungor, S. Improvement of the Contour Method for Measurement of Near-Surface Residual Stresses from Laser Peening. Exp Mech 53, 1705–1718 (2013). https://doi.org/10.1007/s11340-013-9766-x

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