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Title: Use of optical techniques in the assment of the displacement field near the crack tip
Author: Ribeiro, J.E.
Vaz, M.A.P.
Lopes, H.
Melo, F.J.M.Q. de
Monteiro, Jaime
Keywords: Optical Methods
Moiré interferometry
Digital image correlation
Crack tip
Issue Date: 2010
Publisher: Secretaria del Grupo Español de Fractura
Citation: Ribeiro, J.E.; Vaz, M.A.P. ; Lopes, H.; Melo, Francisco; Monteiro, Jaime (2010) - Use of optical techniques in the assment of the displacement field near the crack tip. In Conferência Ibérica de Fractura e Integridade Estrutura. Porto. p.357-360. ISSN: 0213-3725
Abstract: A crack tip represents a highly singular stress field existing in a structural component. The evaluation of the associate strain gradient is difficult using experimental discrete methods. An efficient alternative relies on optical methods which are non contact and give continuous information about displacements fields and its derivatives for strain evaluation. This paper describes some experimental methods to fully characterize the displacement field near a crack tip existing in flat plates. Three optical field techniques based on image analysis were used in the present work; respectively ESPI (Electronic speckle pattern interferometry), MI (Moiré Interferometry), and DIC (digital image correlation). These methods present different resolutions which can be adjusted according to the expected strain gradient. While the first method depends on the laser wavelength, the second depends on the grid pitch and the last on the surface texture.
ISSN: 0213-3725
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Appears in Collections:DTM - Resumos em Proceedings Não Indexados ao ISI/Scopus

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