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Volume 7, Issue 4 (December 1985)

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ISSN: 0884-6804
Page Count: 8

Detection of Delamination Onset in a Composite Laminate Using Moiré Interferometry
Wood, JD
Graduate student, Virginia Polytechnic Institute and State University, VA

Abstract

Moiré 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 moiré 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.



Keywords:
moiré interferometry, damage, composite materials, graphite-epoxy, delamination, edge effects, strain concentrations

Paper ID: CTR10308J
DOI: 10.1520/CTR10308J
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Author Title Detection of Delamination Onset in a Composite Laminate Using Moiré Interferometry Symposium , 0000-00-00 Committee D30