{"id":{"repo_id":"cape-town","oai_identifier":"oai:open.uct.ac.za:11427/8488"},"canonical_url":"https://search.dev.ndltd.org/etd/cape-town/oai:open.uct.ac.za:11427/8488","repository":{"repo_id":"cape-town","name":"University of Cape Town","base_url":"https://open.uct.ac.za/oai/request"},"display":{"title":"Response of thin circular plates to central blast loading","abstract":"The large ductile deformation response and rupture of thin circular metal plates subjected to central blast loading is investigated using the ABAQUS general purpose finite element code. The finite element code incorporates non-linear geometry and material effects as well as strain rate sensitivity. A material failure model is also incorporated. The SA.XI axisymmetric sheet elements are used to model the plate. The shell element uses a theory that includes shear deformation effects but degenerates to the Kirchoff classical thin shell theory for thin shell elements. An explicit time integration scheme is considered more suitable than an implicit scheme for the analysis. A uniform mesh with 1000 elements is used in modelling the experiments. The mesh size is chosen to satisfy the conditions for numerical stability in the explicit analysis scheme. Two boundary conditions are considered; a plate clamped to its supports by bolts and a plate fully built-in. The pressure loading from the explosive charge is assumed to be uniform over the loaded area and decaying exponentially to the plate boundary. The pressure pulse is assumed to be rectangular. Material parameters are obtained from uniaxial quasi-static material tensile test results. The predicted plate responses; mid-plate permanent deflections, permanent deformation shape, strain rate dependence, strain predictions, response time and rupture are compared to experimental data and/or analytical and other numerical solutions. The predicted responses compare reasonably well with measured experimental results and/or with reported analytical and other numerical predictions.","abstract_html":"The large ductile deformation response and rupture of thin circular metal plates subjected to central blast loading is investigated using the ABAQUS general purpose finite element code. The finite element code incorporates non-linear geometry and material effects as well as strain rate sensitivity. A material failure model is also incorporated. The SA.XI axisymmetric sheet elements are used to model the plate. The shell element uses a theory that includes shear deformation effects but degenerates to the Kirchoff classical thin shell theory for thin shell elements. An explicit time integration scheme is considered more suitable than an implicit scheme for the analysis. A uniform mesh with 1000 elements is used in modelling the experiments. The mesh size is chosen to satisfy the conditions for numerical stability in the explicit analysis scheme. Two boundary conditions are considered; a plate clamped to its supports by bolts and a plate fully built-in. The pressure loading from the explosive charge is assumed to be uniform over the loaded area and decaying exponentially to the plate boundary. The pressure pulse is assumed to be rectangular. Material parameters are obtained from uniaxial quasi-static material tensile test results. The predicted plate responses; mid-plate permanent deflections, permanent deformation shape, strain rate dependence, strain predictions, response time and rupture are compared to experimental data and/or analytical and other numerical solutions. The predicted responses compare reasonably well with measured experimental results and/or with reported analytical and other numerical predictions.","abstract_has_math":false,"creators":["Bimha, Richard Ernest"],"institution":"Department of Mechanical Engineering","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":["Nurick, Gerald N"],"committee_chairs":[],"committee_members":[],"year":1996,"date_issued":"1996","date_published":"1996","updated_at":"2026-07-22T22:23:44Z","subjects":[],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/11427/8488","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Nurick, Gerald N"]},{"key":"dc:creator","label":"Author","values":["Bimha, Richard Ernest"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2014-10-17T07:31:14Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2014-10-17T07:31:14Z"]},{"key":"dc:date.issued","label":"Date","values":["1996"]},{"key":"dc:publisher.department","label":"Dc Publisher Department","values":["Department of Mechanical Engineering"]},{"key":"dc:publisher.institution","label":"Dc Publisher Institution","values":["University of Cape Town"]},{"key":"dc:type","label":"Dc Type","values":["Master Thesis"]},{"key":"dc:type.qualificationlevel","label":"Dc Type Qualificationlevel","values":["Masters"]},{"key":"dc:type.qualificationname","label":"Dc Type Qualificationname","values":["MSc"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["eng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/11427/8488"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Includes bibliographical references."]},{"key":"dc:description.abstract","label":"Abstract","values":["The large ductile deformation response and rupture of thin circular metal plates subjected to central blast loading is investigated using the ABAQUS general purpose finite element code. The finite element code incorporates non-linear geometry and material effects as well as strain rate sensitivity. A material failure model is also incorporated. The SA.XI axisymmetric sheet elements are used to model the plate. The shell element uses a theory that includes shear deformation effects but degenerates to the Kirchoff classical thin shell theory for thin shell elements. An explicit time integration scheme is considered more suitable than an implicit scheme for the analysis. A uniform mesh with 1000 elements is used in modelling the experiments. The mesh size is chosen to satisfy the conditions for numerical stability in the explicit analysis scheme. Two boundary conditions are considered; a plate clamped to its supports by bolts and a plate fully built-in. The pressure loading from the explosive charge is assumed to be uniform over the loaded area and decaying exponentially to the plate boundary. The pressure pulse is assumed to be rectangular. Material parameters are obtained from uniaxial quasi-static material tensile test results. The predicted plate responses; mid-plate permanent deflections, permanent deformation shape, strain rate dependence, strain predictions, response time and rupture are compared to experimental data and/or analytical and other numerical solutions. The predicted responses compare reasonably well with measured experimental results and/or with reported analytical and other numerical predictions."]},{"key":"dc:title","label":"Title","values":["Response of thin circular plates to central blast loading"]}]}],"canonical_facts":{"dc:contributor.advisor":["Nurick, Gerald N"],"dc:creator":["Bimha, Richard Ernest"],"dc:date.accessioned":["2014-10-17T07:31:14Z"],"dc:date.available":["2014-10-17T07:31:14Z"],"dc:date.issued":["1996"],"dc:description":["Includes bibliographical references."],"dc:description.abstract":["The large ductile deformation response and rupture of thin circular metal plates subjected to central blast loading is investigated using the ABAQUS general purpose finite element code. The finite element code incorporates non-linear geometry and material effects as well as strain rate sensitivity. A material failure model is also incorporated. The SA.XI axisymmetric sheet elements are used to model the plate. The shell element uses a theory that includes shear deformation effects but degenerates to the Kirchoff classical thin shell theory for thin shell elements. An explicit time integration scheme is considered more suitable than an implicit scheme for the analysis. A uniform mesh with 1000 elements is used in modelling the experiments. The mesh size is chosen to satisfy the conditions for numerical stability in the explicit analysis scheme. Two boundary conditions are considered; a plate clamped to its supports by bolts and a plate fully built-in. The pressure loading from the explosive charge is assumed to be uniform over the loaded area and decaying exponentially to the plate boundary. The pressure pulse is assumed to be rectangular. Material parameters are obtained from uniaxial quasi-static material tensile test results. The predicted plate responses; mid-plate permanent deflections, permanent deformation shape, strain rate dependence, strain predictions, response time and rupture are compared to experimental data and/or analytical and other numerical solutions. The predicted responses compare reasonably well with measured experimental results and/or with reported analytical and other numerical predictions."],"dc:identifier.uri":["http://hdl.handle.net/11427/8488"],"dc:language.iso":["eng"],"dc:publisher.department":["Department of Mechanical Engineering"],"dc:publisher.institution":["University of Cape Town"],"dc:title":["Response of thin circular plates to central blast loading"],"dc:type":["Master Thesis"],"dc:type.qualificationlevel":["Masters"],"dc:type.qualificationname":["MSc"]},"updated_at":"2026-07-22T22:23:44Z"}