{"id":{"repo_id":"nps","oai_identifier":"oai:calhoun.nps.edu:10945/16950"},"canonical_url":"https://search.dev.ndltd.org/etd/nps/oai:calhoun.nps.edu:10945/16950","repository":{"repo_id":"nps","name":"Naval Postgraduate School","base_url":"https://calhoun.nps.edu/server/oai/request"},"display":{"title":"A critical analysis of fatigue-crack propagation data for 2024-T3 aluminum.","abstract":"Fatigue-crack growth data for 2024-T3 aluminum was used to evaluate the accuracy of Forman's equation. Forman's equation was found to predict from one-third to twice the observed cycles to a given crack length when applied to multiple cyclic stress ratios. An alternative approach was developed, based on the observed data, which is applicable to analog or digital fatigue-crack growth prediction. Data acquisition based on constant increment of crack length has been found to yield inadequate definition of the crack-growth curve in the low-cycle range for the successful application of the method. An expression was developed which extends the application of the crack-closure concept to the entire range of cyclic stress ratio. An effective root-mean-square stress was defined which shows indications of good correlation with the magnitude of the crack-growth curves.","abstract_html":"Fatigue-crack growth data for 2024-T3 aluminum was used to evaluate the accuracy of Forman's equation. Forman's equation was found to predict from one-third to twice the observed cycles to a given crack length when applied to multiple cyclic stress ratios. An alternative approach was developed, based on the observed data, which is applicable to analog or digital fatigue-crack growth prediction. Data acquisition based on constant increment of crack length has been found to yield inadequate definition of the crack-growth curve in the low-cycle range for the successful application of the method. An expression was developed which extends the application of the crack-closure concept to the entire range of cyclic stress ratio. An effective root-mean-square stress was defined which shows indications of good correlation with the magnitude of the crack-growth curves.","abstract_has_math":false,"creators":["Kish, Robert Alan"],"institution":"Monterey, California. Naval Postgraduate School","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":"Aeronautics","school":null,"contributors":[],"advisors":["Lindsey, G.H."],"committee_chairs":[],"committee_members":[],"year":1974,"date_issued":"1974-12","date_published":"1974-12","updated_at":"2026-07-27T20:25:42Z","subjects":[],"languages":["en_US"],"rights":["This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. 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An alternative approach was developed, based on the observed data, which is applicable to analog or digital fatigue-crack growth prediction. Data acquisition based on constant increment of crack length has been found to yield inadequate definition of the crack-growth curve in the low-cycle range for the successful application of the method. An expression was developed which extends the application of the crack-closure concept to the entire range of cyclic stress ratio. An effective root-mean-square stress was defined which shows indications of good correlation with the magnitude of the crack-growth curves."]},{"key":"dc:title","label":"Title","values":["A critical analysis of fatigue-crack propagation data for 2024-T3 aluminum."]}]}],"canonical_facts":{"dc:contributor.advisor":["Lindsey, G.H."],"dc:contributor.department":["Aeronautics"],"dc:creator":["Kish, Robert Alan"],"dc:date":["December 1974"],"dc:date.accessioned":["2012-11-13T23:58:24Z"],"dc:date.available":["2012-11-13T23:58:24Z"],"dc:date.issued":["1974-12"],"dc:description.abstract":["Fatigue-crack growth data for 2024-T3 aluminum was used to evaluate the accuracy of Forman's equation. Forman's equation was found to predict from one-third to twice the observed cycles to a given crack length when applied to multiple cyclic stress ratios. An alternative approach was developed, based on the observed data, which is applicable to analog or digital fatigue-crack growth prediction. Data acquisition based on constant increment of crack length has been found to yield inadequate definition of the crack-growth curve in the low-cycle range for the successful application of the method. An expression was developed which extends the application of the crack-closure concept to the entire range of cyclic stress ratio. An effective root-mean-square stress was defined which shows indications of good correlation with the magnitude of the crack-growth curves."],"dc:identifier.uri":["https://hdl.handle.net/10945/16950"],"dc:language.iso":["en_US"],"dc:publisher":["Monterey, California. Naval Postgraduate School"],"dc:rights":["This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States."],"dc:title":["A critical analysis of fatigue-crack propagation data for 2024-T3 aluminum."],"dc:type":["Thesis"]},"updated_at":"2026-07-27T20:25:42Z"}