{"id":{"repo_id":"unm","oai_identifier":"oai:digitalrepository.unm.edu:me_etds-1032"},"canonical_url":"https://search.dev.ndltd.org/etd/unm/oai:digitalrepository.unm.edu:me_etds-1032","repository":{"repo_id":"unm","name":"University of New Mexico","base_url":"https://digitalrepository.unm.edu/do/oai/"},"display":{"title":"Investigation of indentation derived creep response using constant load and constant strain rate methods","abstract":"Time dependent plastic deformation in metals can occur at high temperatures. Typically the creep test is conducted to characterize the deformation features; however, the conventional uniaxial power-law creep test may be impractical for small scale materials. Accordingly, instrumented indentation techniques are frequently employed. This study concerns the employment of instrumented indentation to characterize the power-law creep response of metallic materials. Indentation derived creep response using constant load-hold and constant indentation strain rate methods were investigated through systematic numerical finite element analysis of conical indentation. The model system of pure tin (Sn) and Sn-based alloy with known uniaxial power-law creep parameters is used for direct comparison between constant indentation strain rate and constant load-hold methods. It was found that each method accurately yielded the corresponding creep stress exponent (n); thus, leading to parallel lines of strain rate versus creep stress on the logarithmic scale. It is evident that the constant indentation strain rate method produced more uniform results. A parametric analysis taking into account a wide range of power-law parameters was conducted for the constant indentation strain rate method. A unique trend of strain rate ratio between the uniaxial creep test and indentation creep test was identified.","abstract_html":"Time dependent plastic deformation in metals can occur at high temperatures. Typically the creep test is conducted to characterize the deformation features; however, the conventional uniaxial power-law creep test may be impractical for small scale materials. Accordingly, instrumented indentation techniques are frequently employed. This study concerns the employment of instrumented indentation to characterize the power-law creep response of metallic materials. Indentation derived creep response using constant load-hold and constant indentation strain rate methods were investigated through systematic numerical finite element analysis of conical indentation. The model system of pure tin (Sn) and Sn-based alloy with known uniaxial power-law creep parameters is used for direct comparison between constant indentation strain rate and constant load-hold methods. It was found that each method accurately yielded the corresponding creep stress exponent (n); thus, leading to parallel lines of strain rate versus creep stress on the logarithmic scale. It is evident that the constant indentation strain rate method produced more uniform results. A parametric analysis taking into account a wide range of power-law parameters was conducted for the constant indentation strain rate method. A unique trend of strain rate ratio between the uniaxial creep test and indentation creep test was identified.","abstract_has_math":false,"creators":["Martinez, Nicholas J"],"institution":null,"degree_name":"Mechanical Engineering","degree_level":"Masters","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Shen, Yu-Lin","Tehrani, Mehran","Tarefder, Rafiqul A."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-06-26T07:00:00Z","date_published":"2015-06-26T07:00:00Z","updated_at":"2026-07-24T05:27:04Z","subjects":["Instrumented Indentation ; Indentation Derived Creep Response ; Constant Indentation Strain Rate Method ; Constant Load-Hold Method"],"languages":["English"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["https://digitalrepository.unm.edu/me_etds/33"],"render_values":[{"text":"https://digitalrepository.unm.edu/me_etds/33","href":"https://digitalrepository.unm.edu/me_etds/33","code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/1928/27941","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Shen, Yu-Lin","Tehrani, Mehran","Tarefder, Rafiqul A."]},{"key":"dc:creator","label":"Author","values":["Martinez, Nicholas J"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"thesis:degree_discipline","label":"Discipline","values":["Mechanical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Masters","Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Mechanical Engineering"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Instrumented Indentation ; Indentation Derived Creep Response ; Constant Indentation Strain Rate Method ; Constant Load-Hold Method"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["English"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/1928/27941","https://digitalrepository.unm.edu/me_etds/33"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Time dependent plastic deformation in metals can occur at high temperatures. Typically the creep test is conducted to characterize the deformation features; however, the conventional uniaxial power-law creep test may be impractical for small scale materials. Accordingly, instrumented indentation techniques are frequently employed. This study concerns the employment of instrumented indentation to characterize the power-law creep response of metallic materials. Indentation derived creep response using constant load-hold and constant indentation strain rate methods were investigated through systematic numerical finite element analysis of conical indentation. The model system of pure tin (Sn) and Sn-based alloy with known uniaxial power-law creep parameters is used for direct comparison between constant indentation strain rate and constant load-hold methods. It was found that each method accurately yielded the corresponding creep stress exponent (n); thus, leading to parallel lines of strain rate versus creep stress on the logarithmic scale. It is evident that the constant indentation strain rate method produced more uniform results. A parametric analysis taking into account a wide range of power-law parameters was conducted for the constant indentation strain rate method. A unique trend of strain rate ratio between the uniaxial creep test and indentation creep test was identified."]},{"key":"dc:title","label":"Title","values":["Investigation of indentation derived creep response using constant load and constant strain rate methods"]}]}],"canonical_facts":{"dc:contributor":["Shen, Yu-Lin","Tehrani, Mehran","Tarefder, Rafiqul A."],"dc:creator":["Martinez, Nicholas J"],"dc:description.abstract":["Time dependent plastic deformation in metals can occur at high temperatures. Typically the creep test is conducted to characterize the deformation features; however, the conventional uniaxial power-law creep test may be impractical for small scale materials. Accordingly, instrumented indentation techniques are frequently employed. This study concerns the employment of instrumented indentation to characterize the power-law creep response of metallic materials. Indentation derived creep response using constant load-hold and constant indentation strain rate methods were investigated through systematic numerical finite element analysis of conical indentation. The model system of pure tin (Sn) and Sn-based alloy with known uniaxial power-law creep parameters is used for direct comparison between constant indentation strain rate and constant load-hold methods. It was found that each method accurately yielded the corresponding creep stress exponent (n); thus, leading to parallel lines of strain rate versus creep stress on the logarithmic scale. It is evident that the constant indentation strain rate method produced more uniform results. A parametric analysis taking into account a wide range of power-law parameters was conducted for the constant indentation strain rate method. A unique trend of strain rate ratio between the uniaxial creep test and indentation creep test was identified."],"dc:identifier":["http://hdl.handle.net/1928/27941","https://digitalrepository.unm.edu/me_etds/33"],"dc:language":["English"],"dc:subject":["Instrumented Indentation ; Indentation Derived Creep Response ; Constant Indentation Strain Rate Method ; Constant Load-Hold Method"],"dc:title":["Investigation of indentation derived creep response using constant load and constant strain rate methods"],"thesis:degree_discipline":["Mechanical Engineering"],"thesis:degree_level":["Masters","Thesis"],"thesis:degree_name":["Mechanical Engineering"]},"updated_at":"2026-07-24T05:27:04Z"}