Application of grating shearography and speckle shearography to mechanical analysis of composite material

The present work aims to compare two foremost shearography techniques for a quantitative experiment of composite material: digital phase-shifting speckle pattern and grating shearography. The chosen object was an open-hole tensile specimen fabricated by a non-crimped fabric. Both techniques of laser...

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Bibliographic Details
Published in:Composites. Part A, Applied science and manufacturing Applied science and manufacturing, 2004-01, Vol.35 (7), p.965-976
Main Authors: Lee, Jung-Ryul, Molimard, J., Vautrin, A., Surrel, Y.
Format: Article
Language:English
Subjects:
A. Fabrics/textiles
Applied sciences
B. Anisotropy
C. Laminate mechanics
Composites
D. Non-destructive testing-optical full-field method
E. Manufacturing/Process-RTM
Exact sciences and technology
Forms of application and semi-finished materials
Laminates
Polymer industry, paints, wood
Technology of polymers
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Summary:The present work aims to compare two foremost shearography techniques for a quantitative experiment of composite material: digital phase-shifting speckle pattern and grating shearography. The chosen object was an open-hole tensile specimen fabricated by a non-crimped fabric. Both techniques of laser shearography measured surface strain and x-slope and revealed defects by catching the defect-induced deformation anomalies. In this comparative experiments, grating shearography had superiority in signal-to-noise ratio and spatial resolution to speckle shearography except the labour of the non-trivial specimen preparation. This comparative study will offer mechanical engineers a guideline for the reasonable selection of a technique of shearography for a particular test object.
ISSN:1359-835X
1878-5840
DOI:10.1016/j.compositesa.2004.01.023