{"id":{"repo_id":"cape-town","oai_identifier":"oai:open.uct.ac.za:11427/20126"},"canonical_url":"https://search.dev.ndltd.org/etd/cape-town/oai:open.uct.ac.za:11427/20126","repository":{"repo_id":"cape-town","name":"University of Cape Town","base_url":"https://open.uct.ac.za/oai/request"},"display":{"title":"The effect of bend radius on the impulse transfer characteristics of V-hulls","abstract":"This work is based primarily on the effects of V-tip bend radii on the impulse transfer to V-plates subjected to localised blast loading. Three rigid V-plates with V-angles of 60°, 90° and 120° were designed and fabricated from steel plates. Blast tests with PE4 charges ranging from 19 g to 58 g at a stand-off distance (SOD) of 34mm were performed. The geometric scaling was based on the dimensions of the TM-57 landmine and the Casspir APC MK II. In the numerical model, the optimum element length for the air mesh was obtained by performing a mesh convergence study on the Arbitrary Lagrangian-Eulerian (ALE) mesh, and validated using the impulse values measured from a 58 g detonation onto a 120° V-plate as it resulted in the highest impulse. Element lengths of 1.5, 2.0 and 3.0mm were investigated. Element lengths of 1.5 and 2.0mm both produced accurate results, though the run-time for an element length of 2.0mm was significantly lower. A validation study compared the numerically predicted impulses with those of the experiments and the results were found to be within an acceptable percentage variation. Hence a 2.0mm element length was chosen for the Arbitrary Lagrangian-Eulerian mesh.","abstract_html":"This work is based primarily on the effects of V-tip bend radii on the impulse transfer to V-plates subjected to localised blast loading. Three rigid V-plates with V-angles of 60°, 90° and 120° were designed and fabricated from steel plates. Blast tests with PE4 charges ranging from 19 g to 58 g at a stand-off distance (SOD) of 34mm were performed. The geometric scaling was based on the dimensions of the TM-57 landmine and the Casspir APC MK II. In the numerical model, the optimum element length for the air mesh was obtained by performing a mesh convergence study on the Arbitrary Lagrangian-Eulerian (ALE) mesh, and validated using the impulse values measured from a 58 g detonation onto a 120° V-plate as it resulted in the highest impulse. Element lengths of 1.5, 2.0 and 3.0mm were investigated. Element lengths of 1.5 and 2.0mm both produced accurate results, though the run-time for an element length of 2.0mm was significantly lower. A validation study compared the numerically predicted impulses with those of the experiments and the results were found to be within an acceptable percentage variation. Hence a 2.0mm element length was chosen for the Arbitrary Lagrangian-Eulerian mesh.","abstract_has_math":false,"creators":["Shekhar, Vinay Ramaswami"],"institution":"Department of Mechanical Engineering","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":["Langdon, Genevieve"],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015","date_published":"2015","updated_at":"2026-07-22T22:22:49Z","subjects":[],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/11427/20126","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Langdon, Genevieve"]},{"key":"dc:creator","label":"Author","values":["Shekhar, Vinay Ramaswami"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2016-06-24T06:32:37Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2016-06-24T06:32:37Z"]},{"key":"dc:date.issued","label":"Date","values":["2015"]},{"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 (Eng)"]}]},{"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/11427/20126"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["This work is based primarily on the effects of V-tip bend radii on the impulse transfer to V-plates subjected to localised blast loading. Three rigid V-plates with V-angles of 60°, 90° and 120° were designed and fabricated from steel plates. Blast tests with PE4 charges ranging from 19 g to 58 g at a stand-off distance (SOD) of 34mm were performed. The geometric scaling was based on the dimensions of the TM-57 landmine and the Casspir APC MK II. In the numerical model, the optimum element length for the air mesh was obtained by performing a mesh convergence study on the Arbitrary Lagrangian-Eulerian (ALE) mesh, and validated using the impulse values measured from a 58 g detonation onto a 120° V-plate as it resulted in the highest impulse. Element lengths of 1.5, 2.0 and 3.0mm were investigated. Element lengths of 1.5 and 2.0mm both produced accurate results, though the run-time for an element length of 2.0mm was significantly lower. A validation study compared the numerically predicted impulses with those of the experiments and the results were found to be within an acceptable percentage variation. Hence a 2.0mm element length was chosen for the Arbitrary Lagrangian-Eulerian mesh."]},{"key":"dc:title","label":"Title","values":["The effect of bend radius on the impulse transfer characteristics of V-hulls"]}]}],"canonical_facts":{"dc:contributor.advisor":["Langdon, Genevieve"],"dc:creator":["Shekhar, Vinay Ramaswami"],"dc:date.accessioned":["2016-06-24T06:32:37Z"],"dc:date.available":["2016-06-24T06:32:37Z"],"dc:date.issued":["2015"],"dc:description.abstract":["This work is based primarily on the effects of V-tip bend radii on the impulse transfer to V-plates subjected to localised blast loading. Three rigid V-plates with V-angles of 60°, 90° and 120° were designed and fabricated from steel plates. Blast tests with PE4 charges ranging from 19 g to 58 g at a stand-off distance (SOD) of 34mm were performed. The geometric scaling was based on the dimensions of the TM-57 landmine and the Casspir APC MK II. In the numerical model, the optimum element length for the air mesh was obtained by performing a mesh convergence study on the Arbitrary Lagrangian-Eulerian (ALE) mesh, and validated using the impulse values measured from a 58 g detonation onto a 120° V-plate as it resulted in the highest impulse. Element lengths of 1.5, 2.0 and 3.0mm were investigated. Element lengths of 1.5 and 2.0mm both produced accurate results, though the run-time for an element length of 2.0mm was significantly lower. A validation study compared the numerically predicted impulses with those of the experiments and the results were found to be within an acceptable percentage variation. Hence a 2.0mm element length was chosen for the Arbitrary Lagrangian-Eulerian mesh."],"dc:identifier.uri":["http://hdl.handle.net/11427/20126"],"dc:language.iso":["eng"],"dc:publisher.department":["Department of Mechanical Engineering"],"dc:publisher.institution":["University of Cape Town"],"dc:title":["The effect of bend radius on the impulse transfer characteristics of V-hulls"],"dc:type":["Master Thesis"],"dc:type.qualificationlevel":["Masters"],"dc:type.qualificationname":["MSc (Eng)"]},"updated_at":"2026-07-22T22:22:49Z"}