{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/85895"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/85895","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Fatigue and Fracture Behavior of High Strength and High Conductivity Copper Alloys for High Heat Flux Applications","abstract":"The fatigue performance of CuAl25 and CuCrZr and OFHC copper was also evaluated under creep-fatigue loading conditions. It was found that creep and stress relaxation have a major impact on fatigue behavior. Fatigue lives were reduced notably with hold time even at room temperature. Hold times are most damaging at low strain ranges and long fatigue lives. This effect was observed with hold periods as short as 10 seconds. Analysis revealed that the stress relaxation behavior during hold is comparable to transient creep behavior where dislocation glide is the dominant creep deformation mechanism. It was also determined that crack initiation and propagation at grain boundaries was accelerated under creep-fatigue loading conditions.","abstract_html":"The fatigue performance of CuAl25 and CuCrZr and OFHC copper was also evaluated under creep-fatigue loading conditions. It was found that creep and stress relaxation have a major impact on fatigue behavior. Fatigue lives were reduced notably with hold time even at room temperature. Hold times are most damaging at low strain ranges and long fatigue lives. This effect was observed with hold periods as short as 10 seconds. Analysis revealed that the stress relaxation behavior during hold is comparable to transient creep behavior where dislocation glide is the dominant creep deformation mechanism. It was also determined that crack initiation and propagation at grain boundaries was accelerated under creep-fatigue loading conditions.","abstract_has_math":false,"creators":["Li, Meimei"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Nuclear Engineering","degree_department":null,"school":null,"contributors":["Stubbins, James F."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-09-28T14:50:56Z","date_published":"2015-09-28T14:50:56Z","updated_at":"2026-07-22T22:26:26Z","subjects":["Engineering, Materials Science"],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(MiAaPQ)AAI3086117"],"render_values":[{"text":"(MiAaPQ)AAI3086117","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/85895","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Stubbins, James F."]},{"key":"dc:creator","label":"Author","values":["Li, Meimei"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-09-28T14:50:56Z","10000-01-01","2003"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Nuclear Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Engineering, Materials Science"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/85895","(MiAaPQ)AAI3086117"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The fatigue performance of CuAl25 and CuCrZr and OFHC copper was also evaluated under creep-fatigue loading conditions. It was found that creep and stress relaxation have a major impact on fatigue behavior. Fatigue lives were reduced notably with hold time even at room temperature. Hold times are most damaging at low strain ranges and long fatigue lives. This effect was observed with hold periods as short as 10 seconds. Analysis revealed that the stress relaxation behavior during hold is comparable to transient creep behavior where dislocation glide is the dominant creep deformation mechanism. It was also determined that crack initiation and propagation at grain boundaries was accelerated under creep-fatigue loading conditions.","Made available in DSpace on 2015-09-28T14:50:56Z (GMT). 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It was found that creep and stress relaxation have a major impact on fatigue behavior. Fatigue lives were reduced notably with hold time even at room temperature. Hold times are most damaging at low strain ranges and long fatigue lives. This effect was observed with hold periods as short as 10 seconds. Analysis revealed that the stress relaxation behavior during hold is comparable to transient creep behavior where dislocation glide is the dominant creep deformation mechanism. It was also determined that crack initiation and propagation at grain boundaries was accelerated under creep-fatigue loading conditions.","Made available in DSpace on 2015-09-28T14:50:56Z (GMT). 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