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Fatigue design of oil tankers: a design approach

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dc.contributor.authorFranklin, Paulen
dc.contributor.committeechairHughes, Owen F.en
dc.contributor.committeememberNikolaidis, Efstratiosen
dc.contributor.committeememberNeu, Wayne L.en
dc.contributor.committeememberJohnson, Eric R.en
dc.contributor.committeememberPlaut, Raymond H.en
dc.contributor.departmentAerospace and Ocean Engineeringen
dc.date.accessioned2014-03-14T20:17:42Zen
dc.date.adate2005-10-26en
dc.date.available2014-03-14T20:17:42Zen
dc.date.issued1993-12-15en
dc.date.rdate2005-10-26en
dc.date.sdate2005-10-26en
dc.description.abstractThe oil tankers that operate on the Trans-Alaska Pipeline Service (TAPS) route have exhibited a large number of structural fatigue cracks. These cracks can be attributed to the increase in use of high strength steel in tanker construction and to the harsh operating environment in the Gulf of Alaska. In response to the TAPS fatigue problem, this project examines the topic of preliminary design for fatigue resistance. The TAPS tankers have previously been the target of several studies on the subject of fatigue cracking. Most of these studies have concentrated on reducing the costs and risks involved with operating the current tanker fleet. Preliminary design, however, is oriented at reducing the fatigue risk in future tanker designs. To that end, the design method outlined within concentrates on the level of analysis that is appropriate for preliminary design. The design method consists of four steps: the specification of a wave environment, generation of a hydrodynamic model and subsequent wave loads, evaluation of cyclic stresses and an assessment of fatigue damage. A series of example calculations that is typical of preliminary design has been performed for one of the TAPS tanker classes. These calculations employed Buckley's climatic wave spectra, a 3-dimensional panel based hydrodynamics package by Lin and a Miner's rule fatigue assessment based on the S-N curves of the British Welding Institute. The example calculations yield two important results. First, relatively inexpensive methods can yie1d important and accurate fatigue results; for a side shell longitudinal at the water line the example calculations predict a fatigue life of approximately 3 operating years. This corresponds quite well to the published inspection data and obviously represents insufficient fatigue life. Second, local panel pressures can have a significant contribution to, and even dominate, total fatigue damage in the side shell. This contrasts with conventional fatigue studies of ship hulls which focus on global loads; i.e., hull girder bending.en
dc.description.degreePh. D.en
dc.format.extentvii, 91 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-10262005-101005en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-10262005-101005/en
dc.identifier.urihttp://hdl.handle.net/10919/29379en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V856_1993.F726.pdfen
dc.relation.isformatofOCLC# 29815414en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V856 1993.F726en
dc.subject.lcshSteel -- Fatigueen
dc.subject.lcshTankers -- Design and constructionen
dc.titleFatigue design of oil tankers: a design approachen
dc.typeDissertationen
dc.type.dcmitypeTexten
thesis.degree.disciplineAerospace and Ocean Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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