Abstract

Moire interferometry was used to detect and measure delaminations in a graphite-epoxy composite laminate. The laminate used was a [(±30)2/¯9¯0]s layup. A uniform strain was subtracted from the full-field moire pattern by changing the frequency of the reference grating. This technique accentuated the nonuniform strains allowing very high resolution measurements of strain concentrations. These strain concentrations include free-edge effects, resin rich regions and delaminations.

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