Remarks on Residual Stress Measurement by Hole-Drilling and Electronic Speckle Pattern Interferometry

<table>Speckle correlation fringes recorded after four drilling increments obtained by subtraction the real time recorded pattern from the initial reference pattern.</table>

The Scientific World Journal

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Figure 3

Figure 3: Remarks on Residual Stress Measurement by Hole-Drilling and Electronic Speckle Pattern Interferometry 