The holographic-hole drilling method for residual stress determination |
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Authors: | DV Nelson A Makino EA Fuchs |
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Institution: | Department of Mechanical Engineering, Stanford University, Stanford, CA 94305-4021, USA;Materials Performance Department, Sandia National Laboratories, Livermore, CA 94551-0969, USA |
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Abstract: | Holographic-hole drilling is a method developed for the rapid determination of residual stresses from an optical interference fringe pattern. A small diameter blind hole is drilled into a part containing residual stresses, and the displacements caused by localized stress relief are registered by real-time holographic interferometry. The resulting fringe pattern is evaluated to calculate residual stresses, using a simple ‘fringe counting’ method described here. Results of applying the method in laboratory tests to a variety of uniform biaxial states-of-stress from equibiaxial compression to pure shear are shown. Two sample applications of the method, the evaluation of residual stresses at a cold-worked hole and at a weld bead, are also given. Extensions of the method to evaluate stresses non-uniform in depth and/or along the surface are discussed. |
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