Determination of sub-surface distributions of residual stresses by a holographic-hole drilling technique

A method is described for combining incremental hole drilling with holographic interferometry to determine the distribution of in-plane residual stresses as a function of depth below the surface. The computational foundation of the method is summarized. Results of experiments to check the ability of the method to determine two different sub-surface stress distributions are given. Utilizing the same hologram, the feasibility of obtaining results at greater depths by drilling a large hole directly over a preceding smaller one is demonstrated.

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