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Diffraction grating interferometers for mechanical characterisations of advanced fabric laminates
Authors:Jung-Ryul Lee  Jrme Molimard  Alain Vautrin  Yves Surrel
Institution:aStructural Health Monitoring Group, Research Institute of Instrumentation Frontier, National Institute of Advanced Industrial Science and Technology, AIST Tsukuba Central 2, Tsukuba 305-8568, Japan;bMeM/SMS, Ecole Nationale Supérieure des Mines de Saint-Etienne, 158 Cours Fauriel, 42023 Saint-Etienne Cedex 2, France;cBNM/INM, Conservatoire National des Arts et Métiers, 292 rue Saint Martin, 75141 Paris, France
Abstract:It is demonstrated that two grating interferometers with high spatial resolutions can successfully be applied for the mechanical characterisation of the advanced fabric composite materials. Based on these two techniques, the mechanical properties of two kinds of fabric laminates are obtained without assumption of uniform strain fields to be used in the characterisation approaches using the local strain sensors. The degree of the yarn crimp effects of the two laminates is compared in terms of the out-of-plane displacement derivatives. Especially, it is shown that the grating shearing interferometer is appropriate for the crimped fabric structure requiring a three-dimensional analysis. The modification from moiré interferometer to grating shearing interferometer is performed by introducing a Michelson interferometer modified for image shearing.
Keywords:Non-crimped new concept  Plain-weave fabric  Moiré  interferometry  Grating shearography
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