Assessment of the displacement field along a surface crack in a flat plate using optical techniques

Ribeiro, J.E.; Vaz, M.A.P.; Lopes, Hernani; Melo, F.J.M.Q. de; Monteiro, Jaime M.

Publication

Assessment of the displacement field along a surface crack in a flat plate using optical techniques

2015Journal article

dc.contributor.author	Ribeiro, J.E.
dc.contributor.author	Vaz, M.A.P.
dc.contributor.author	Lopes, Hernani
dc.contributor.author	Melo, F.J.M.Q. de
dc.contributor.author	Monteiro, Jaime M.
dc.date.accessioned	2017-02-16T10:51:12Z
dc.date.available	2017-02-16T10:51:12Z
dc.date.issued	2015
dc.description.abstract	Structural components may contain cracks, and for these components a crack tip represents a highly singular stress. The evaluation of the associated strain gradient is difficult to achieve with experimental discrete methods. An efficient alternative are the optical techniques which are non-contact, and so delivering continuous information of the displacement fields and associated 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, Electronic Speckle Pattern Interferometry, Moir ´e Interferometry, and Digital Image Correlation. These methods allow different resolutions which can be adjusted according to the expected strain gradient. While the first method depends on the laser wavelength and position of the illumination sources, the second depends on the grating pitch and the last on the surface texture or painted speckle. Algorithms to derivate and filtering the displacement field are developed to compute the strain field and will be used for further works.	pt_PT
dc.description.version	info:eu-repo/semantics/publishedVersion	pt_PT
dc.identifier.citation	Ribeiro, J.E.; Vaz, M.A.P.; Lopes, H.; Melo, F.; Monteiro, J. (2015). Assessment of the displacement field along a surface crack in a flat plate using optical techniques. Experimental Techniques. ISSN 0732-8818. 39:5, p. 10-20.	pt_PT
dc.identifier.doi	10.1111/j.1747-1567.2012.00856.x
dc.identifier.issn	0732-8818
dc.identifier.uri	http://hdl.handle.net/10198/14034
dc.language.iso	eng	pt_PT
dc.peerreviewed	yes	pt_PT
dc.publisher	Wiley Online Library	pt_PT
dc.rights.uri	http://creativecommons.org/licenses/by/4.0/	pt_PT
dc.subject	Digital image correlation	pt_PT
dc.subject	Fracture mechanics	pt_PT
dc.subject	Interferometry moiré	pt_PT
dc.subject	Optical methods	pt_PT
dc.subject	Speckle interferometry	pt_PT
dc.title	Assessment of the displacement field along a surface crack in a flat plate using optical techniques	pt_PT
dc.type	journal article
dspace.entity.type	Publication
oaire.citation.endPage	20	pt_PT
oaire.citation.issue	5	pt_PT
oaire.citation.startPage	10	pt_PT
oaire.citation.title	Experimental Techniques	pt_PT
oaire.citation.volume	39	pt_PT
person.familyName	Ribeiro
person.givenName	J.E.
person.identifier	R-000-6Y8
person.identifier.ciencia-id	0F15-FB62-29DB
person.identifier.orcid	0000-0001-6300-148X
person.identifier.rid	G-3839-2018
person.identifier.scopus-author-id	25638652400
rcaap.rights	restrictedAccess	pt_PT
rcaap.type	article	pt_PT
relation.isAuthorOfPublication	c90169e6-7889-4270-a096-35b98c75f9f9
relation.isAuthorOfPublication.latestForDiscovery	c90169e6-7889-4270-a096-35b98c75f9f9