{"id":{"repo_id":"vt","oai_identifier":"oai:vtechworks.lib.vt.edu:10919/64657"},"canonical_url":"https://search.dev.ndltd.org/etd/vt/oai:vtechworks.lib.vt.edu:10919/64657","repository":{"repo_id":"vt","name":"Virginia Tech","base_url":"https://vtechworks.lib.vt.edu/oai/request"},"display":{"title":"The effect of diffused hydrogen on the torsional fatigue life of 2024-T351 aluminum alloy","abstract":"Fatigue tests in reversed torsion were run on 2024-T351 aluminum alloy specimens into which hydrogen had been diffused. The diffusion was accomplished by placing the specimens in a hydrogen environment (>99.5%) for 25 days at 2000 psi [13.8 MPa] and 123°C. A control group was tested which underwent the same temperature conditions for 25 days. The fatigue tests were run at low (20-25%) and high (85-90%) relative humidities and at shear stress levels of approximately 13400, 16800, and 20100 psi [89.6, 117, and 138 MPa]. The results of this investigation show that hydrogen charging has no effect on the torsional fatigue life of aluminum. However, a change in the crack propagation angle at high relative humidity for a ductile, circumferential crack on uncharged specimens to a brittle, 45° crack on hydrogen-charged specimens may be the result of hydrogen embrittlement.","abstract_html":"Fatigue tests in reversed torsion were run on 2024-T351 aluminum alloy specimens into which hydrogen had been diffused. The diffusion was accomplished by placing the specimens in a hydrogen environment (>99.5%) for 25 days at 2000 psi [13.8 MPa] and 123°C. A control group was tested which underwent the same temperature conditions for 25 days. The fatigue tests were run at low (20-25%) and high (85-90%) relative humidities and at shear stress levels of approximately 13400, 16800, and 20100 psi [89.6, 117, and 138 MPa]. The results of this investigation show that hydrogen charging has no effect on the torsional fatigue life of aluminum. However, a change in the crack propagation angle at high relative humidity for a ductile, circumferential crack on uncharged specimens to a brittle, 45° crack on hydrogen-charged specimens may be the result of hydrogen embrittlement.","abstract_has_math":false,"creators":["Kauffmann, Charles Joseph"],"institution":"Virginia Polytechnic Institute and State University","degree_name":"Master of Science","degree_level":"masters","degree_discipline":"Mechanical Engineering","degree_department":"Mechanical Engineering","school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1978,"date_issued":"1978","date_published":"1978","updated_at":"2026-07-22T22:18:44Z","subjects":[],"languages":["en"],"rights":["In Copyright"],"rights_urls":["http://rightsstatements.org/vocab/InC/1.0/"],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/10919/64657","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.department","label":"Department","values":["Mechanical Engineering"]},{"key":"dc:creator","label":"Author","values":["Kauffmann, Charles Joseph"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2016-02-01T14:45:17Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2016-02-01T14:45:17Z"]},{"key":"dc:date.issued","label":"Date","values":["1978"]},{"key":"dc:publisher","label":"Institution","values":["Virginia Polytechnic Institute and State University"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"dc:type.dcmitype","label":"Dc Type Dcmitype","values":["Text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Mechanical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["masters"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Virginia Polytechnic Institute and State University"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["In Copyright"]},{"key":"dc:rights.uri","label":"Rights URI","values":["http://rightsstatements.org/vocab/InC/1.0/"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/10919/64657"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Fatigue tests in reversed torsion were run on 2024-T351 aluminum alloy specimens into which hydrogen had been diffused. The diffusion was accomplished by placing the specimens in a hydrogen environment (>99.5%) for 25 days at 2000 psi [13.8 MPa] and 123°C. A control group was tested which underwent the same temperature conditions for 25 days. The fatigue tests were run at low (20-25%) and high (85-90%) relative humidities and at shear stress levels of approximately 13400, 16800, and 20100 psi [89.6, 117, and 138 MPa]. The results of this investigation show that hydrogen charging has no effect on the torsional fatigue life of aluminum. However, a change in the crack propagation angle at high relative humidity for a ductile, circumferential crack on uncharged specimens to a brittle, 45° crack on hydrogen-charged specimens may be the result of hydrogen embrittlement."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["Master of Science"]},{"key":"dc:format.mimetype","label":"Dc Format Mimetype","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["The effect of diffused hydrogen on the torsional fatigue life of 2024-T351 aluminum alloy"]}]}],"canonical_facts":{"dc:contributor.department":["Mechanical Engineering"],"dc:creator":["Kauffmann, Charles Joseph"],"dc:date.accessioned":["2016-02-01T14:45:17Z"],"dc:date.available":["2016-02-01T14:45:17Z"],"dc:date.issued":["1978"],"dc:description.abstract":["Fatigue tests in reversed torsion were run on 2024-T351 aluminum alloy specimens into which hydrogen had been diffused. The diffusion was accomplished by placing the specimens in a hydrogen environment (>99.5%) for 25 days at 2000 psi [13.8 MPa] and 123°C. A control group was tested which underwent the same temperature conditions for 25 days. The fatigue tests were run at low (20-25%) and high (85-90%) relative humidities and at shear stress levels of approximately 13400, 16800, and 20100 psi [89.6, 117, and 138 MPa]. The results of this investigation show that hydrogen charging has no effect on the torsional fatigue life of aluminum. However, a change in the crack propagation angle at high relative humidity for a ductile, circumferential crack on uncharged specimens to a brittle, 45° crack on hydrogen-charged specimens may be the result of hydrogen embrittlement."],"dc:description.degree":["Master of Science"],"dc:format.mimetype":["application/pdf"],"dc:identifier.uri":["http://hdl.handle.net/10919/64657"],"dc:language.iso":["en"],"dc:publisher":["Virginia Polytechnic Institute and State University"],"dc:rights":["In Copyright"],"dc:rights.uri":["http://rightsstatements.org/vocab/InC/1.0/"],"dc:title":["The effect of diffused hydrogen on the torsional fatigue life of 2024-T351 aluminum alloy"],"dc:type":["Thesis"],"dc:type.dcmitype":["Text"],"thesis:degree_discipline":["Mechanical Engineering"],"thesis:degree_level":["masters"],"thesis:degree_name":["Master of Science"],"thesis:institution_name":["Virginia Polytechnic Institute and State University"]},"updated_at":"2026-07-22T22:18:44Z"}