{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/98241"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/98241","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Modeling and simulation of creep rupture in high-temperature alloys","abstract":"It has been well established that one of the main causes of rupture in high-temperature alloys is intergranular cavitation: the nucleation, growth, and coalescence of voids along grain boundaries. It is also well known that intergranular voids grow under the influence of several physical processes, including matter diffusion along the void surface, matter diffusion along the grain boundary, and bulk creep of the surrounding grains. Creep rupture modeling efforts to date have considered at most two of these three void growth mechanisms at a time. Furthermore, when bulk creep is accounted for, primary creep effects are rarely, if ever, addressed. The purpose of this dissertation is to develop more accurate micromechanical models of creep rupture that can be used to gain further insight into the failure of high temperature alloys. We consider such model systems as a stationary crack tip in the absence of voids, a single intergranular void growing under the influence of surface diffusion, grain boundary diffusion, and bulk creep (including primary creep effects), and several intergranular voids growing ahead of a crack tip. We find that the interplay between the three aforementioned void growth mechanisms can lead to interesting and sometimes unexpected predicted rupture behavior. We also find that void growth can be significantly accelerated in the primary creep regime, compared to the secondary creep regime. Our results lead us to believe that these physical processes, when present, play an important role in the rupture of high temperature alloys, and should therefore be taken into account when designing high-temperature system components. Failure to do so might result in overestimates of component lifetimes, and consequently, unsafe operating conditions.","abstract_html":"It has been well established that one of the main causes of rupture in high-temperature alloys is intergranular cavitation: the nucleation, growth, and coalescence of voids along grain boundaries. It is also well known that intergranular voids grow under the influence of several physical processes, including matter diffusion along the void surface, matter diffusion along the grain boundary, and bulk creep of the surrounding grains. Creep rupture modeling efforts to date have considered at most two of these three void growth mechanisms at a time. Furthermore, when bulk creep is accounted for, primary creep effects are rarely, if ever, addressed. The purpose of this dissertation is to develop more accurate micromechanical models of creep rupture that can be used to gain further insight into the failure of high temperature alloys. We consider such model systems as a stationary crack tip in the absence of voids, a single intergranular void growing under the influence of surface diffusion, grain boundary diffusion, and bulk creep (including primary creep effects), and several intergranular voids growing ahead of a crack tip. We find that the interplay between the three aforementioned void growth mechanisms can lead to interesting and sometimes unexpected predicted rupture behavior. We also find that void growth can be significantly accelerated in the primary creep regime, compared to the secondary creep regime. Our results lead us to believe that these physical processes, when present, play an important role in the rupture of high temperature alloys, and should therefore be taken into account when designing high-temperature system components. Failure to do so might result in overestimates of component lifetimes, and consequently, unsafe operating conditions.","abstract_has_math":false,"creators":["Sanders, John Walter"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Theoretical & Applied Mechans","degree_department":null,"school":null,"contributors":["Sofronis, Petros","Stubbins, James","Sehitoglu, Huseyin","Ertekin, Elif"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2017,"date_issued":"2017-09-29T16:39:11Z","date_published":"2017-09-29T16:39:11Z","updated_at":"2026-07-22T22:24:35Z","subjects":["Creep","Rupture","High-temperature","Metals","Cavitation","Void","Damage"],"languages":["en"],"rights":["Copyright 2017 John W. Sanders"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/98241","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Sofronis, Petros","Stubbins, James","Sehitoglu, Huseyin","Ertekin, Elif"]},{"key":"dc:creator","label":"Author","values":["Sanders, John Walter"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2017-09-29T16:39:11Z","2021-09-29T09:15:12Z","2017-06-23","2017-08"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Theoretical & Applied Mechans"]},{"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":["Creep","Rupture","High-temperature","Metals","Cavitation","Void","Damage"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2017 John W. Sanders"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/98241"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["It has been well established that one of the main causes of rupture in high-temperature alloys is intergranular cavitation: the nucleation, growth, and coalescence of voids along grain boundaries. It is also well known that intergranular voids grow under the influence of several physical processes, including matter diffusion along the void surface, matter diffusion along the grain boundary, and bulk creep of the surrounding grains. Creep rupture modeling efforts to date have considered at most two of these three void growth mechanisms at a time. Furthermore, when bulk creep is accounted for, primary creep effects are rarely, if ever, addressed. The purpose of this dissertation is to develop more accurate micromechanical models of creep rupture that can be used to gain further insight into the failure of high temperature alloys. We consider such model systems as a stationary crack tip in the absence of voids, a single intergranular void growing under the influence of surface diffusion, grain boundary diffusion, and bulk creep (including primary creep effects), and several intergranular voids growing ahead of a crack tip. We find that the interplay between the three aforementioned void growth mechanisms can lead to interesting and sometimes unexpected predicted rupture behavior. We also find that void growth can be significantly accelerated in the primary creep regime, compared to the secondary creep regime. Our results lead us to believe that these physical processes, when present, play an important role in the rupture of high temperature alloys, and should therefore be taken into account when designing high-temperature system components. Failure to do so might result in overestimates of component lifetimes, and consequently, unsafe operating conditions.","Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2019-08-01","The student, John Sanders, accepted the attached license on 2017-06-22 at 16:22.","The student, John Sanders, submitted this Dissertation for approval on 2017-06-22 at 16:37.","This Dissertation was approved for publication on 2017-06-23 at 11:29.","DSpace SAF Submission Ingestion Package generated from Vireo submission #11255 on 2017-09-29 at 11:13:49","Made available in DSpace on 2017-09-29T16:39:11Z (GMT). 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It is also well known that intergranular voids grow under the influence of several physical processes, including matter diffusion along the void surface, matter diffusion along the grain boundary, and bulk creep of the surrounding grains. Creep rupture modeling efforts to date have considered at most two of these three void growth mechanisms at a time. Furthermore, when bulk creep is accounted for, primary creep effects are rarely, if ever, addressed. The purpose of this dissertation is to develop more accurate micromechanical models of creep rupture that can be used to gain further insight into the failure of high temperature alloys. We consider such model systems as a stationary crack tip in the absence of voids, a single intergranular void growing under the influence of surface diffusion, grain boundary diffusion, and bulk creep (including primary creep effects), and several intergranular voids growing ahead of a crack tip. We find that the interplay between the three aforementioned void growth mechanisms can lead to interesting and sometimes unexpected predicted rupture behavior. We also find that void growth can be significantly accelerated in the primary creep regime, compared to the secondary creep regime. Our results lead us to believe that these physical processes, when present, play an important role in the rupture of high temperature alloys, and should therefore be taken into account when designing high-temperature system components. Failure to do so might result in overestimates of component lifetimes, and consequently, unsafe operating conditions.","Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2019-08-01","The student, John Sanders, accepted the attached license on 2017-06-22 at 16:22.","The student, John Sanders, submitted this Dissertation for approval on 2017-06-22 at 16:37.","This Dissertation was approved for publication on 2017-06-23 at 11:29.","DSpace SAF Submission Ingestion Package generated from Vireo submission #11255 on 2017-09-29 at 11:13:49","Made available in DSpace on 2017-09-29T16:39:11Z (GMT). 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Sanders"],"dc:subject":["Creep","Rupture","High-temperature","Metals","Cavitation","Void","Damage"],"dc:title":["Modeling and simulation of creep rupture in high-temperature alloys"],"dc:type":["text"],"thesis:degree_discipline":["Theoretical & Applied Mechans"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:35Z"}