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Full-field deformation measurement in wood using digital image processing

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dc.contributor.authorAgrawal, Chandra Prakashen
dc.contributor.committeememberLoferski, Joseph R.en
dc.contributor.committeememberHenneke, Edmund G. IIen
dc.contributor.committeememberConners, Richard W.en
dc.contributor.committeememberMcNeill, Stephen R.en
dc.contributor.departmentWood Science and Forest Productsen
dc.date.accessioned2014-03-14T21:37:44Zen
dc.date.adate2012-06-10en
dc.date.available2014-03-14T21:37:44Zen
dc.date.issued1989-08-18en
dc.date.rdate2012-06-10en
dc.date.sdate2012-06-10en
dc.description.abstractA digital image processing system was used to non-destructively measure the full-field deformation on aluminum and wood specimens loaded in compression and bending. The measurement technique consisted of creating a random speckle pattern on the specimen surface, recording images before deformation and after deformation, and computing the relative displacements of small image subsets. Two methods for producing speckle patterns on the specimens were studied: spray paint and adhesive-backed photographic film. Baseline tests were conducted to evaluate the influence of signal noise on the measurement system. Uniform translation tests were conducted to evaluate the capability of the system for measuring finite motion. the technique was used to monitor the full-field deformation response of aluminum and wood specimens tested in bending and static compression. Moderate duration compression creep tests were conducted, on the wood specimens to investigate the suitability of the system for monitoring the creep response of materials. The results obtained from the two speckle techniques were also. compared. The results showed that for the magnification and speckle patterns tested displacement measurements smaller than 3.29x10-4 inch may be unreliable due to signal noise.en
dc.description.degreeMaster of Scienceen
dc.format.extentxi, 103 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-06102012-040427en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-06102012-040427/en
dc.identifier.urihttp://hdl.handle.net/10919/43078en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1989.A363.pdfen
dc.relation.isformatofOCLC# 20601980en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1989.A363en
dc.subject.lcshImage processing -- Digital techniquesen
dc.subject.lcshWood -- Testing -- Researchen
dc.titleFull-field deformation measurement in wood using digital image processingen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineWood Science and Forest Productsen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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