Full-field displacement measurement of a speckle grid by using a mesh-free deformation function

Andrianopoulos, NP

dc.contributor.author	Andrianopoulos, NP	en
dc.date.accessioned	2014-03-01T01:24:26Z
dc.date.available	2014-03-01T01:24:26Z
dc.date.issued	2006	en
dc.identifier.issn	0039-2103	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/17262
dc.subject	Digital imaging	en
dc.subject	Mesh-free methods	en
dc.subject	Moving least squares	en
dc.subject	Speckle grids	en
dc.subject.classification	Materials Science, Characterization & Testing	en
dc.subject.other	Computer simulation	en
dc.subject.other	Deformation	en
dc.subject.other	Least squares approximations	en
dc.subject.other	Numerical methods	en
dc.subject.other	Speckle	en
dc.subject.other	Strain	en
dc.subject.other	Full-field displacement measurement	en
dc.subject.other	Mesh-free deformation function	en
dc.subject.other	Speckle grid	en
dc.subject.other	Image processing	en
dc.title	Full-field displacement measurement of a speckle grid by using a mesh-free deformation function	en
heal.type	journalArticle	en
heal.identifier.primary	10.1111/j.1475-1305.2006.00287.x	en
heal.identifier.secondary	http://dx.doi.org/10.1111/j.1475-1305.2006.00287.x	en
heal.language	English	en
heal.publicationDate	2006	en
heal.abstract	In the present study, a combined experimental-numerical technique for the determination of the displacement and strain fields in the surface of a deformable body is described. The experimental part of this technique is based on the recording of the pair of images of the surface before and after deformation of the body, by means of a digital camera. This is done after spraying the surface with a random field of speckles (dots). Then the dots (having finite dimensions) of the second image are identified and uniquely paired with the dots of the first image. This permits the experimental determination of the deformation field in the surface. Then, by means of a mesh-free numerical method, a smoothed deformation field can be constructed. For that, the moving least square method is applied. The deformation field being available, the corresponding strain field can easily be obtained. Numerical simulation of this technique in three simple examples indicates that promising applications are expected. © 2006 The Author. Journal compilation 2006 Blackwell Publishing Ltd.	en
heal.publisher	BLACKWELL PUBLISHING	en
heal.journalName	Strain	en
dc.identifier.doi	10.1111/j.1475-1305.2006.00287.x	en
dc.identifier.isi	ISI:000241347200004	en
dc.identifier.volume	42	en
dc.identifier.issue	4	en
dc.identifier.spage	265	en
dc.identifier.epage	271	en