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|Title:||Measuring displacement field detection of unbounded regions in a single lap Joint with moiré|
|Publisher:||Michel Grédiac & Jonathan Huntley|
|Citation:||Ribeiro, J.E.; Vaz, M.A.; Lopes, H.; Monteiro, J.; Piloto, P.A.G. (2006) - Measuring displacement field detection of unbounded regions in a single lap Joint with moiré. In Photomechanics 2006. Clermont-Ferrand, France.|
|Abstract:||The goal of this work is the development of an experimental technique to measure the displacement field and to perform detection of unbonded regions  in a single lap joint [2, 3]. The proposed experimental technique is based on the use of Moiré Interferometry. It is a field technique that allows in-plane displacement measurements without contact and with high resolution [4, 5]. Grating replication techniques were developed to record high quality diffraction gratings onto the specimen’s surfaces . It was also, developed an optical assembly of laser interferometry used to generate the master grating (virtual) . A tension load was applied to a lap joint and its deformation was accessed by the interference between the reference grating, recorded on the object surface, and virtual master grating generated by laser interferometry. A phase shifting technique  was developed to allow the phase map calculation. Image processing techniques  will be used to assess the in-plane displacement field. A finite elements code (ANSYS®) will be used to calculate the displacement field [10, 11]. An unbonded region in a single lap joint was numerically simulated and the obtained results will be compared with those obtained in the experimental work. In the figure 1 it’s possible to observe the displacement field, measured in a horizontal direction, of a single lap sound joint: and the results obtained by numerical simulation.|
|Appears in Collections:||DMA - Posters em Encontros Científicos Internacionais|
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