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Industrial applications of residual stress determination using 2D in-plane sensitive fiber ESPI and hole drilling

A fiber electronic speckle pattern interferometry (ESPI) system composed by two sets of Leendertz dual-beam illumination arranged in perpendicular directions is applied to determine residual stresses of materials combining with the blind-hole-drilling method. Although high stress concentration and severe surface decorrelation resulted from hole-drilling process would affect the fringe visibility considerably, the system still generates satisfactory fringe patterns from the point of view of data retrieval. Simple approaches to interpret values of uniaxial and uniform residual stresses from displacement sensitive fringe contours are described and demonstrated for industrial applications.