Fatigue growth and closure of short cracks

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dc.contributor.authorIyyer, Nagaraja S.en
dc.contributor.committeechairDowling, N.E.en
dc.contributor.committeememberSmith, C.W.en
dc.contributor.committeememberReddy, Junuthula N.en
dc.contributor.committeememberDuke, John C. Jr.en
dc.contributor.committeememberSwanson, Robert E.en
dc.contributor.departmentEngineering Mechanicsen
dc.date.accessioned2015-05-14T16:36:16Zen
dc.date.available2015-05-14T16:36:16Zen
dc.date.issued1988en
dc.description.abstractA study has been carried out to investigate the growth and closure behavior of short cracks in 2024-T351 aluminum alloy and four different conditions of 4340 steel using through thickness cracks of straight fronts. The experiments were carried out to study the influence of stress level, stress ratio, yield strength and prior austenitic grain A sizes in notched and unnotched specimens. The stereoimaging technique was developed and adapted to obtain crack closing and opening points, and also near tip displacement fields. Experimental results are presented with a general discussion. It was found that long cracks showed good correlation when analyzed in terms of effective stress intensity range. However,correlations were poor for short cracks. lt was found that short cracks show less closure behavior than long cracks. The estimates of initial crack lengths based on linear elastic data were made. These estimates differed significantly from the actual initial crack lengths for completely reversed cycling tests. Suggestions have been made to the equivalent initial flaw size approach and conclusions have been drawn.en
dc.description.degreePh. D.en
dc.format.extentxix, 277 leavesen
dc.format.mimetypeapplication/pdfen
dc.identifier.urihttp://hdl.handle.net/10919/52324en
dc.language.isoen_USen
dc.publisherVirginia Polytechnic Institute and State Universityen
dc.relation.isformatofOCLC# 19719126en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V856 1988.I993en
dc.subject.lcshAluminum alloys -- Fatigueen
dc.subject.lcshSteel -- Fatigueen
dc.titleFatigue growth and closure of short cracksen
dc.typeDissertationen
dc.type.dcmitypeTexten
thesis.degree.disciplineEngineering Mechanicsen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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