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The effect of hydrogen on the fatigue life of high strength steel

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dc.contributor.authorWilson, James H.en
dc.contributor.committeechairMcNitt, R. P.en
dc.contributor.committeememberMabie, Hamilton H.en
dc.contributor.committeememberPadis, L. A.en
dc.contributor.committeememberStinchcomb, Wayne W.en
dc.contributor.committeememberPap, Arpad A.en
dc.contributor.departmentEngineering Science and Mechanicsen
dc.date.accessioned2014-03-14T21:09:25Zen
dc.date.adate2013-02-06en
dc.date.available2014-03-14T21:09:25Zen
dc.date.issued1978-08-05en
dc.date.rdate2013-02-06en
dc.date.sdate2013-02-06en
dc.description.abstractTorsional fatigue tests were conducted on 4370 steel oil quenched and tempered at 1000° F in (l) the uncharged state, (2) the hydrogen charged state, and (3) in a hydrogen environment. The tests were conducted on both smooth (K<sub>t</sub> = l.l) and V-notch (K<sub>t</sub> = 3.8) test specimens. A statistical analysis conducted at the 99% confidence limit for the smooth test specimens indicated that precharging with hydrogen increased the fatigue life of the material and also the fracture surface of the test specimens changed from a circumferential crack to a 45° diagonal crack. At a 90% confidence limit, charging with hydrogen did not affect the fatigue life of the V-notched specimens. At a 99% confidence limit for both the smooth and V-notched test specimens, testing in a hydrogen environment increased the fatigue life of the material. Bending fatigue tests were also conducted on the same material and the results indicated that charging with hydrogen decreased fatigue life of smooth test specimens (K<sub>t</sub> = l.l) but increased the fatigue life for V-notched specimens (K<sub>t</sub> = 2.4 and 3.8).en
dc.description.degreePh. D.en
dc.format.extentvi, 155 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-02062013-040204en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-02062013-040204/en
dc.identifier.urihttp://hdl.handle.net/10919/37333en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V856_1978.W538.pdfen
dc.relation.isformatofOCLC# 09976990en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V856 1978.W538en
dc.subject.lcshSteel -- Fatigueen
dc.subject.lcshSteel -- Hydrogen contenten
dc.titleThe effect of hydrogen on the fatigue life of high strength steelen
dc.typeDissertationen
dc.type.dcmitypeTexten
thesis.degree.disciplineEngineering Science and Mechanicsen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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