{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/101584"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/101584","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Fatigue crack growth in hydrogen pipeline steels","abstract":"Pipeline hydrogen transport and distribution are contemplated for hydrogen applications. Hydrogen introduction in the natural gas pipeline systems is also considered in the power to gas (P2G) approach to utilizing excess renewable energy when the supply exceeds the demand. It is well known that hydrogen embrittles all carbon steels used to manufacture pipelines and hence, safety and reliability of hydrogen transport requires that pipelines be assessed and tested against hydrogen embrittlement. The most severe embrittlement mechanism is hydrogen accelerated fatigue crack growth since it is well known that hydrogen can enhance fatigue crack growth rates by a factor of 10. In this thesis, the fatigue life of a line pipe manufactured with API steel is calculated by investigating the growth of a semi-elliptical crack on the inner diameter surface due to hydrogen pressure fluctuation. This behavior is compared with the life of the line pipe in an inert environment (e.g. natural gas or N2) under the same pressure fluctuations. The hydrogen or the inert environment pressure history is analyzed with the rainflow counting method and the crack depth calculations are carried out for a variety of API steels at load ratios for a given initial crack depth. The load ratio R equals where and are respectively the minimum and maximum stress intensity factors in a pressure cycle the crack experiences due to the pressure fluctuations. In particular for API X42 steel for which experimental data are available for calculations with greater load ratio, the fatigue life is calculated at load ratios and . The calculation of the stress intensity factor was done by using the closed form solution of Zahoor for which the validity range with regard to the crack and line pipe dimensions was established through comparisons with numerical calculations. The results demonstrate that hydrogen markedly accelerates crack growth and the initial crack depth has significant effect on the pipeline life.","abstract_html":"Pipeline hydrogen transport and distribution are contemplated for hydrogen applications. Hydrogen introduction in the natural gas pipeline systems is also considered in the power to gas (P2G) approach to utilizing excess renewable energy when the supply exceeds the demand. It is well known that hydrogen embrittles all carbon steels used to manufacture pipelines and hence, safety and reliability of hydrogen transport requires that pipelines be assessed and tested against hydrogen embrittlement. The most severe embrittlement mechanism is hydrogen accelerated fatigue crack growth since it is well known that hydrogen can enhance fatigue crack growth rates by a factor of 10. In this thesis, the fatigue life of a line pipe manufactured with API steel is calculated by investigating the growth of a semi-elliptical crack on the inner diameter surface due to hydrogen pressure fluctuation. This behavior is compared with the life of the line pipe in an inert environment (e.g. natural gas or N2) under the same pressure fluctuations. The hydrogen or the inert environment pressure history is analyzed with the rainflow counting method and the crack depth calculations are carried out for a variety of API steels at load ratios for a given initial crack depth. The load ratio R equals where and are respectively the minimum and maximum stress intensity factors in a pressure cycle the crack experiences due to the pressure fluctuations. In particular for API X42 steel for which experimental data are available for calculations with greater load ratio, the fatigue life is calculated at load ratios and . The calculation of the stress intensity factor was done by using the closed form solution of Zahoor for which the validity range with regard to the crack and line pipe dimensions was established through comparisons with numerical calculations. The results demonstrate that hydrogen markedly accelerates crack growth and the initial crack depth has significant effect on the pipeline life.","abstract_has_math":false,"creators":["Che, Ziwei"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Sofronis, Petros","Dadfarnia, Mohsen"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2018,"date_issued":"2018-09-27T16:17:52Z","date_published":"2018-09-27T16:17:52Z","updated_at":"2026-07-22T22:24:40Z","subjects":["fatigue, API steel, stress intensity factor"],"languages":["en"],"rights":["Copyright 2018 Ziwei Che"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/101584","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Sofronis, Petros","Dadfarnia, Mohsen"]},{"key":"dc:creator","label":"Author","values":["Che, Ziwei"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2018-09-27T16:17:52Z","2018-07-17","2018-08"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Mechanical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"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":["fatigue, API steel, stress intensity factor"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2018 Ziwei Che"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/101584"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Pipeline hydrogen transport and distribution are contemplated for hydrogen applications. Hydrogen introduction in the natural gas pipeline systems is also considered in the power to gas (P2G) approach to utilizing excess renewable energy when the supply exceeds the demand. It is well known that hydrogen embrittles all carbon steels used to manufacture pipelines and hence, safety and reliability of hydrogen transport requires that pipelines be assessed and tested against hydrogen embrittlement. The most severe embrittlement mechanism is hydrogen accelerated fatigue crack growth since it is well known that hydrogen can enhance fatigue crack growth rates by a factor of 10. In this thesis, the fatigue life of a line pipe manufactured with API steel is calculated by investigating the growth of a semi-elliptical crack on the inner diameter surface due to hydrogen pressure fluctuation. This behavior is compared with the life of the line pipe in an inert environment (e.g. natural gas or N2) under the same pressure fluctuations. The hydrogen or the inert environment pressure history is analyzed with the rainflow counting method and the crack depth calculations are carried out for a variety of API steels at load ratios for a given initial crack depth. The load ratio R equals where and are respectively the minimum and maximum stress intensity factors in a pressure cycle the crack experiences due to the pressure fluctuations. In particular for API X42 steel for which experimental data are available for calculations with greater load ratio, the fatigue life is calculated at load ratios and . The calculation of the stress intensity factor was done by using the closed form solution of Zahoor for which the validity range with regard to the crack and line pipe dimensions was established through comparisons with numerical calculations. The results demonstrate that hydrogen markedly accelerates crack growth and the initial crack depth has significant effect on the pipeline life.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2018-09-27 without embargo terms","The student, Ziwei Che, accepted the attached license on 2018-07-16 at 15:40.","The student, Ziwei Che, submitted this Thesis for approval on 2018-07-16 at 15:53.","This Thesis was approved for publication on 2018-07-17 at 09:24.","DSpace SAF Submission Ingestion Package generated from Vireo submission #12875 on 2018-09-27 at 10:48:31","Made available in DSpace on 2018-09-27T16:17:52Z (GMT). No. of bitstreams: 2 CHE-THESIS-2018.pdf: 4833611 bytes, checksum: de01d1e8b6ebb9e6e37ce5343c2e2554 (MD5) LICENSE.txt: 4206 bytes, checksum: 5b7b4079c5955811967eb87b9f58b87b (MD5) Previous issue date: 2018-07-17"]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Fatigue crack growth in hydrogen pipeline steels"]}]}],"canonical_facts":{"dc:contributor":["Sofronis, Petros","Dadfarnia, Mohsen"],"dc:creator":["Che, Ziwei"],"dc:date":["2018-09-27T16:17:52Z","2018-07-17","2018-08"],"dc:description":["Pipeline hydrogen transport and distribution are contemplated for hydrogen applications. Hydrogen introduction in the natural gas pipeline systems is also considered in the power to gas (P2G) approach to utilizing excess renewable energy when the supply exceeds the demand. It is well known that hydrogen embrittles all carbon steels used to manufacture pipelines and hence, safety and reliability of hydrogen transport requires that pipelines be assessed and tested against hydrogen embrittlement. The most severe embrittlement mechanism is hydrogen accelerated fatigue crack growth since it is well known that hydrogen can enhance fatigue crack growth rates by a factor of 10. In this thesis, the fatigue life of a line pipe manufactured with API steel is calculated by investigating the growth of a semi-elliptical crack on the inner diameter surface due to hydrogen pressure fluctuation. This behavior is compared with the life of the line pipe in an inert environment (e.g. natural gas or N2) under the same pressure fluctuations. The hydrogen or the inert environment pressure history is analyzed with the rainflow counting method and the crack depth calculations are carried out for a variety of API steels at load ratios for a given initial crack depth. The load ratio R equals where and are respectively the minimum and maximum stress intensity factors in a pressure cycle the crack experiences due to the pressure fluctuations. In particular for API X42 steel for which experimental data are available for calculations with greater load ratio, the fatigue life is calculated at load ratios and . The calculation of the stress intensity factor was done by using the closed form solution of Zahoor for which the validity range with regard to the crack and line pipe dimensions was established through comparisons with numerical calculations. The results demonstrate that hydrogen markedly accelerates crack growth and the initial crack depth has significant effect on the pipeline life.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2018-09-27 without embargo terms","The student, Ziwei Che, accepted the attached license on 2018-07-16 at 15:40.","The student, Ziwei Che, submitted this Thesis for approval on 2018-07-16 at 15:53.","This Thesis was approved for publication on 2018-07-17 at 09:24.","DSpace SAF Submission Ingestion Package generated from Vireo submission #12875 on 2018-09-27 at 10:48:31","Made available in DSpace on 2018-09-27T16:17:52Z (GMT). No. of bitstreams: 2 CHE-THESIS-2018.pdf: 4833611 bytes, checksum: de01d1e8b6ebb9e6e37ce5343c2e2554 (MD5) LICENSE.txt: 4206 bytes, checksum: 5b7b4079c5955811967eb87b9f58b87b (MD5) Previous issue date: 2018-07-17"],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/2142/101584"],"dc:language":["en"],"dc:rights":["Copyright 2018 Ziwei Che"],"dc:subject":["fatigue, API steel, stress intensity factor"],"dc:title":["Fatigue crack growth in hydrogen pipeline steels"],"dc:type":["text"],"thesis:degree_discipline":["Mechanical Engineering"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:40Z"}