Improvement of the Contour Method for Measurement of Near-Surface Residual Stresses from Laser Peening |
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Authors: | M B Toparli M E Fitzpatrick S Gungor |
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Institution: | 1. Materials Engineering, The Open University, Walton Hall, Milton Keynes, MK7 6AA, UK 2. Defense Industries Research and Development Institute (TüB?TAK SAGE), P.K. 16, 06261, Mamak, Ankara, Turkey
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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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