{"id":{"repo_id":"wvu","oai_identifier":"oai:researchrepository.wvu.edu:etd-1964"},"canonical_url":"https://search.dev.ndltd.org/etd/wvu/oai:researchrepository.wvu.edu:etd-1964","repository":{"repo_id":"wvu","name":"West Virginia University","base_url":"https://researchrepository.wvu.edu/do/oai/"},"display":{"title":"Numerical analysis of direct-chill casting of aluminum ingot","abstract":"Direct chill (DC) semi-continuous casting is the most efficient way to produce large aluminum ingots. This process consists of three main stages; transient stage, steady-state stage, and post-drop stage. During transient stage, the ingot is subjected to rapid cooling rate and thus resulted in the build-up of high thermal stresses that can often lead to ingot cracking failure.;Based on a fully coupled heat-transfer and thermal-stress analysis model, which has been developed using a commercial finite element (FE) package ABAQUS(TM) with a user subroutine developed in-house, the temperature and stress fields were obtained for various casting conditions. Three post-processing programs were developed to analyze and present the FE simulation results. The first program, CONVERT, processes data files from ABAQUS(TM) and then determines the normalized stresses in the ingot. The magnitude, location of maximum stress level, and the directions of maximum principal stresses are determined to assess the mechanism of ingot cracking. The second program, REGRESS, is used for statistical regression analysis, which involves casting parameters such as casting speed, water flow rate, ingot aspect ratio, and comer radius. Results of REGRESS are input to a program, PREDICTION, which provides visualization of the temperature and stress fields on a PC monitor. Further, the user can choose desired casting parameters in PREDICTION to predict temperature and stress fields at selected ingot lengths during casting. Validity of the program PREDICTION is checked with additional simulation results from ABAQUS(TM) and good agreement is noted.","abstract_html":"Direct chill (DC) semi-continuous casting is the most efficient way to produce large aluminum ingots. This process consists of three main stages; transient stage, steady-state stage, and post-drop stage. During transient stage, the ingot is subjected to rapid cooling rate and thus resulted in the build-up of high thermal stresses that can often lead to ingot cracking failure.;Based on a fully coupled heat-transfer and thermal-stress analysis model, which has been developed using a commercial finite element (FE) package ABAQUS(TM) with a user subroutine developed in-house, the temperature and stress fields were obtained for various casting conditions. Three post-processing programs were developed to analyze and present the FE simulation results. The first program, CONVERT, processes data files from ABAQUS(TM) and then determines the normalized stresses in the ingot. The magnitude, location of maximum stress level, and the directions of maximum principal stresses are determined to assess the mechanism of ingot cracking. The second program, REGRESS, is used for statistical regression analysis, which involves casting parameters such as casting speed, water flow rate, ingot aspect ratio, and comer radius. Results of REGRESS are input to a program, PREDICTION, which provides visualization of the temperature and stress fields on a PC monitor. Further, the user can choose desired casting parameters in PREDICTION to predict temperature and stress fields at selected ingot lengths during casting. Validity of the program PREDICTION is checked with additional simulation results from ABAQUS(TM) and good agreement is noted.","abstract_has_math":false,"creators":["Wu, Yaping"],"institution":null,"degree_name":"MS","degree_level":"Thesis","degree_discipline":"Mechanical and Aerospace Engineering","degree_department":null,"school":null,"contributors":["Bruce Kang."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1999,"date_issued":"1999-05-01T07:00:00Z","date_published":"1999-05-01T07:00:00Z","updated_at":"2026-07-24T06:15:08Z","subjects":["Mechanical engineering","Engineering","Materials science"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["https://researchrepository.wvu.edu/etd/961"],"render_values":[{"text":"https://researchrepository.wvu.edu/etd/961","href":"https://researchrepository.wvu.edu/etd/961","code":true}]}]},"links":{"outbound_url":"https://doi.org/10.33915/etd.961","outbound_label":"DOI","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Bruce Kang."]},{"key":"dc:creator","label":"Author","values":["Wu, Yaping"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.available","label":"Dc Date Available","values":["2019-01-17T08:00:00Z"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Mechanical and Aerospace Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["MS"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Mechanical engineering","Engineering","Materials science"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://doi.org/10.33915/etd.961","https://researchrepository.wvu.edu/etd/961"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Direct chill (DC) semi-continuous casting is the most efficient way to produce large aluminum ingots. This process consists of three main stages; transient stage, steady-state stage, and post-drop stage. During transient stage, the ingot is subjected to rapid cooling rate and thus resulted in the build-up of high thermal stresses that can often lead to ingot cracking failure.;Based on a fully coupled heat-transfer and thermal-stress analysis model, which has been developed using a commercial finite element (FE) package ABAQUS(TM) with a user subroutine developed in-house, the temperature and stress fields were obtained for various casting conditions. Three post-processing programs were developed to analyze and present the FE simulation results. The first program, CONVERT, processes data files from ABAQUS(TM) and then determines the normalized stresses in the ingot. The magnitude, location of maximum stress level, and the directions of maximum principal stresses are determined to assess the mechanism of ingot cracking. The second program, REGRESS, is used for statistical regression analysis, which involves casting parameters such as casting speed, water flow rate, ingot aspect ratio, and comer radius. Results of REGRESS are input to a program, PREDICTION, which provides visualization of the temperature and stress fields on a PC monitor. Further, the user can choose desired casting parameters in PREDICTION to predict temperature and stress fields at selected ingot lengths during casting. Validity of the program PREDICTION is checked with additional simulation results from ABAQUS(TM) and good agreement is noted."]},{"key":"dc:title","label":"Title","values":["Numerical analysis of direct-chill casting of aluminum ingot"]}]}],"canonical_facts":{"dc:contributor":["Bruce Kang."],"dc:creator":["Wu, Yaping"],"dc:date.available":["2019-01-17T08:00:00Z"],"dc:description.abstract":["Direct chill (DC) semi-continuous casting is the most efficient way to produce large aluminum ingots. This process consists of three main stages; transient stage, steady-state stage, and post-drop stage. During transient stage, the ingot is subjected to rapid cooling rate and thus resulted in the build-up of high thermal stresses that can often lead to ingot cracking failure.;Based on a fully coupled heat-transfer and thermal-stress analysis model, which has been developed using a commercial finite element (FE) package ABAQUS(TM) with a user subroutine developed in-house, the temperature and stress fields were obtained for various casting conditions. Three post-processing programs were developed to analyze and present the FE simulation results. The first program, CONVERT, processes data files from ABAQUS(TM) and then determines the normalized stresses in the ingot. The magnitude, location of maximum stress level, and the directions of maximum principal stresses are determined to assess the mechanism of ingot cracking. The second program, REGRESS, is used for statistical regression analysis, which involves casting parameters such as casting speed, water flow rate, ingot aspect ratio, and comer radius. Results of REGRESS are input to a program, PREDICTION, which provides visualization of the temperature and stress fields on a PC monitor. Further, the user can choose desired casting parameters in PREDICTION to predict temperature and stress fields at selected ingot lengths during casting. Validity of the program PREDICTION is checked with additional simulation results from ABAQUS(TM) and good agreement is noted."],"dc:identifier":["https://doi.org/10.33915/etd.961","https://researchrepository.wvu.edu/etd/961"],"dc:subject":["Mechanical engineering","Engineering","Materials science"],"dc:title":["Numerical analysis of direct-chill casting of aluminum ingot"],"thesis:degree_discipline":["Mechanical and Aerospace Engineering"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["MS"]},"updated_at":"2026-07-24T06:15:08Z"}