{"id":{"repo_id":"buffalo","oai_identifier":"oai:ubir.buffalo.edu:10477/80048"},"canonical_url":"https://search.dev.ndltd.org/etd/buffalo/oai:ubir.buffalo.edu:10477/80048","repository":{"repo_id":"buffalo","name":"Buffalo","base_url":"https://ubir.buffalo.edu/oai/request"},"display":{"title":"Unified Mechanics Theory: Finite Element Modeling on Mechanical Damage for Lead-Rubber Bearings","abstract":"M.S.","abstract_html":"M.S.","abstract_has_math":false,"creators":["Murillo, Claudia"],"institution":"State University of New York at Buffalo","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Basaran, Cemal","Civil, Structural and Environmental Engineering"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2019,"date_issued":"2019-07-30T15:12:06Z","date_published":"2019-07-30T15:12:06Z","updated_at":"2026-07-27T19:05:23Z","subjects":["materials science","civil engineering","design"],"languages":["eng"],"rights":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/10477/80048","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Basaran, Cemal","Civil, Structural and Environmental Engineering"]},{"key":"dc:creator","label":"Author","values":["Murillo, Claudia"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2019-07-30T15:12:06Z","2019","2019-05-18 19:50:29"]},{"key":"dc:publisher","label":"Institution","values":["State University of New York at Buffalo"]},{"key":"dc:type","label":"Dc Type","values":["Text","Thesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["materials science","civil engineering","design"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/10477/80048"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["M.S.","Several studies have been developed to estimate the reduction of the characteristic strength of the Lead Rubber Bearing (LRB) respect to the increment of the cycles. This phenomenon has been observed in several experimental studies involving cyclic motion, but no means to predict this behavior using analytical analysis, and involving temperature changes of the lead has been reached yet. LRBs are used worldwide as devices for seismic isolation of buildings and bridges, for new structures and retrofit projects. This document presents the first attempt for the implementation of the Unified Mechanics Theory to simulate entropy generation (or damage evolution) of the mechanical properties of high purity lead core of a Base isolator type LRB. A finite element model was made in ABAQUS using 3D elements. Thermodynamic based constitutive models comprise the UMAT subroutine to update the Jacobian matrix of the material properties of the lead core, for each time increment with the respective temperature increment associated. These constitutive models involve, viscoplasticity defined by a yield surface, kinematic hardening and finally damage in the material. The results are compared to experimental test done at State University of New York at Buffalo (UB) by (Kalpakidis & Constatinou, 2008), specifically the example No 10 was taken as the validation test, which dimensions are described as “typical” for an LRB in base isolation in Latin America. After several computationally expensive versions of the model, convergence was reached and degradation of the lead core was observed, the shear force obtained was bigger than expected. However, the energy dissipated by cycle has similar tendency to the actual laboratory test, with adjusted values."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Unified Mechanics Theory: Finite Element Modeling on Mechanical Damage for Lead-Rubber Bearings"]}]}],"canonical_facts":{"dc:contributor":["Basaran, Cemal","Civil, Structural and Environmental Engineering"],"dc:creator":["Murillo, Claudia"],"dc:date":["2019-07-30T15:12:06Z","2019","2019-05-18 19:50:29"],"dc:description":["M.S.","Several studies have been developed to estimate the reduction of the characteristic strength of the Lead Rubber Bearing (LRB) respect to the increment of the cycles. This phenomenon has been observed in several experimental studies involving cyclic motion, but no means to predict this behavior using analytical analysis, and involving temperature changes of the lead has been reached yet. LRBs are used worldwide as devices for seismic isolation of buildings and bridges, for new structures and retrofit projects. This document presents the first attempt for the implementation of the Unified Mechanics Theory to simulate entropy generation (or damage evolution) of the mechanical properties of high purity lead core of a Base isolator type LRB. A finite element model was made in ABAQUS using 3D elements. Thermodynamic based constitutive models comprise the UMAT subroutine to update the Jacobian matrix of the material properties of the lead core, for each time increment with the respective temperature increment associated. These constitutive models involve, viscoplasticity defined by a yield surface, kinematic hardening and finally damage in the material. The results are compared to experimental test done at State University of New York at Buffalo (UB) by (Kalpakidis & Constatinou, 2008), specifically the example No 10 was taken as the validation test, which dimensions are described as “typical” for an LRB in base isolation in Latin America. After several computationally expensive versions of the model, convergence was reached and degradation of the lead core was observed, the shear force obtained was bigger than expected. However, the energy dissipated by cycle has similar tendency to the actual laboratory test, with adjusted values."],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/10477/80048"],"dc:language":["eng"],"dc:publisher":["State University of New York at Buffalo"],"dc:rights":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."],"dc:subject":["materials science","civil engineering","design"],"dc:title":["Unified Mechanics Theory: Finite Element Modeling on Mechanical Damage for Lead-Rubber Bearings"],"dc:type":["Text","Thesis"]},"updated_at":"2026-07-27T19:05:23Z"}