{"id":{"repo_id":"cape-town","oai_identifier":"oai:open.uct.ac.za:11427/40343"},"canonical_url":"https://search.dev.ndltd.org/etd/cape-town/oai:open.uct.ac.za:11427/40343","repository":{"repo_id":"cape-town","name":"University of Cape Town","base_url":"https://open.uct.ac.za/oai/request"},"display":{"title":"Response of composite and steel V-structures to localised air blast loading - Numerical and Experimental","abstract":"This research investigated the blast performance of Glass-Fibre Reinforced Polymer (GFRP) Vstructures compared to equivalent mass steel V-structures. The blast performance was measured in terms of three metrics, namely, impulse transferred, maximum mid-point deflection and permanent damage/deformation. A series of blast experiments were performed on manufactured GFRP and steel V-structures. The GFRP V-structures were made using Vacuum Infusion (VI), using a 400 g m−2 woven E-glass and a Prime 20LV resin with a Low Viscosity (LV) slow hardener. The steel V-structures were manufactured by laser cutting the flat panel profiles from a sheet of 2 mm thick DOMEX-700 MC sheet and then Computer Numerical Control (CNC) bending them to the desired profile. Three panel configurations were experimentally blast tested, namely, a 105° V-angle with a 32 mm V-tip radius, a 105° V-angle with a 62 mm V-tip radius and a 120° V-angle with a 32 mm V-tip radius. Blast tests were performed by detonating PE4 charges ranging from 10 g to 40 g at a Stand-Off Distance (SOD) of 34 mm. Digital Image Correlation (DIC) was used to track the transient deformation of the V-structures, while the final deformed profile of the V-structures was determined using a 3D scanner. A series of numerical simulations were also performed on the GFRP and steel V-structures. The simulations used quarter symmetry models to utilise the symmetry of the experimental setup. The material model parameters were obtained from a series of material tests carried out on GFRP and steel specimens. The simulations were validated against the experimental results for a number of test cases for impulse transfer, and transient and permanent deformation. The simulations were then extended to look at a range of V-tip radii, V-angles and charge masses, while the SOD was held constant. For the steel V-structures, the blast experiments found that increasing the V-tip radius and Vangle resulted in an increase in impulse transferred as well as transient and permanent mid-point deflection. This result was confirmed when the set of V-tip radii investigated was increased in the simulations. The trends in the results for the GFRP V-structures were similar to the equivalent steel plates. The delamination and total crack length were observed to increase with an increase in V-angle and charge mass. In general, the study found that GFRP V-structures were inferior to their equivalent mass steel V-structures in terms of panel rupture threshold. The GFRP V-structures exhibited lower transient deformation, but panel rupture on the rear face was observed at a lower charge mass. No tearing or rupture was observed in the steel V-structures tested at similar charge masses.","abstract_html":"This research investigated the blast performance of Glass-Fibre Reinforced Polymer (GFRP) Vstructures compared to equivalent mass steel V-structures. The blast performance was measured in terms of three metrics, namely, impulse transferred, maximum mid-point deflection and permanent damage/deformation. A series of blast experiments were performed on manufactured GFRP and steel V-structures. The GFRP V-structures were made using Vacuum Infusion (VI), using a 400 g m−2 woven E-glass and a Prime 20LV resin with a Low Viscosity (LV) slow hardener. The steel V-structures were manufactured by laser cutting the flat panel profiles from a sheet of 2 mm thick DOMEX-700 MC sheet and then Computer Numerical Control (CNC) bending them to the desired profile. Three panel configurations were experimentally blast tested, namely, a 105° V-angle with a 32 mm V-tip radius, a 105° V-angle with a 62 mm V-tip radius and a 120° V-angle with a 32 mm V-tip radius. Blast tests were performed by detonating PE4 charges ranging from 10 g to 40 g at a Stand-Off Distance (SOD) of 34 mm. Digital Image Correlation (DIC) was used to track the transient deformation of the V-structures, while the final deformed profile of the V-structures was determined using a 3D scanner. A series of numerical simulations were also performed on the GFRP and steel V-structures. The simulations used quarter symmetry models to utilise the symmetry of the experimental setup. The material model parameters were obtained from a series of material tests carried out on GFRP and steel specimens. The simulations were validated against the experimental results for a number of test cases for impulse transfer, and transient and permanent deformation. The simulations were then extended to look at a range of V-tip radii, V-angles and charge masses, while the SOD was held constant. For the steel V-structures, the blast experiments found that increasing the V-tip radius and Vangle resulted in an increase in impulse transferred as well as transient and permanent mid-point deflection. This result was confirmed when the set of V-tip radii investigated was increased in the simulations. The trends in the results for the GFRP V-structures were similar to the equivalent steel plates. The delamination and total crack length were observed to increase with an increase in V-angle and charge mass. In general, the study found that GFRP V-structures were inferior to their equivalent mass steel V-structures in terms of panel rupture threshold. The GFRP V-structures exhibited lower transient deformation, but panel rupture on the rear face was observed at a lower charge mass. No tearing or rupture was observed in the steel V-structures tested at similar charge masses.","abstract_has_math":false,"creators":["Shekhar, Vinay"],"institution":"Department of Mechanical Engineering","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":["Von Klemperer, Christopher","Langdon Genevieve"],"committee_chairs":[],"committee_members":[],"year":2023,"date_issued":"2023","date_published":"2023","updated_at":"2026-07-22T22:23:12Z","subjects":["Mechanical Engineering"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/11427/40343","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Von Klemperer, Christopher","Langdon Genevieve"]},{"key":"dc:creator","label":"Author","values":["Shekhar, Vinay"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2024-07-04T14:08:26Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2024-07-04T14:08:26Z"]},{"key":"dc:date.issued","label":"Date","values":["2023"]},{"key":"dc:publisher.department","label":"Dc Publisher Department","values":["Department of Mechanical Engineering"]},{"key":"dc:type","label":"Dc Type","values":["Thesis / Dissertation"]},{"key":"dc:type.qualificationlevel","label":"Dc Type Qualificationlevel","values":["Doctoral","PhD"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Mechanical Engineering"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/11427/40343"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["This research investigated the blast performance of Glass-Fibre Reinforced Polymer (GFRP) Vstructures compared to equivalent mass steel V-structures. The blast performance was measured in terms of three metrics, namely, impulse transferred, maximum mid-point deflection and permanent damage/deformation. A series of blast experiments were performed on manufactured GFRP and steel V-structures. The GFRP V-structures were made using Vacuum Infusion (VI), using a 400 g m−2 woven E-glass and a Prime 20LV resin with a Low Viscosity (LV) slow hardener. The steel V-structures were manufactured by laser cutting the flat panel profiles from a sheet of 2 mm thick DOMEX-700 MC sheet and then Computer Numerical Control (CNC) bending them to the desired profile. Three panel configurations were experimentally blast tested, namely, a 105° V-angle with a 32 mm V-tip radius, a 105° V-angle with a 62 mm V-tip radius and a 120° V-angle with a 32 mm V-tip radius. Blast tests were performed by detonating PE4 charges ranging from 10 g to 40 g at a Stand-Off Distance (SOD) of 34 mm. Digital Image Correlation (DIC) was used to track the transient deformation of the V-structures, while the final deformed profile of the V-structures was determined using a 3D scanner. A series of numerical simulations were also performed on the GFRP and steel V-structures. The simulations used quarter symmetry models to utilise the symmetry of the experimental setup. The material model parameters were obtained from a series of material tests carried out on GFRP and steel specimens. The simulations were validated against the experimental results for a number of test cases for impulse transfer, and transient and permanent deformation. The simulations were then extended to look at a range of V-tip radii, V-angles and charge masses, while the SOD was held constant. For the steel V-structures, the blast experiments found that increasing the V-tip radius and Vangle resulted in an increase in impulse transferred as well as transient and permanent mid-point deflection. This result was confirmed when the set of V-tip radii investigated was increased in the simulations. The trends in the results for the GFRP V-structures were similar to the equivalent steel plates. The delamination and total crack length were observed to increase with an increase in V-angle and charge mass. In general, the study found that GFRP V-structures were inferior to their equivalent mass steel V-structures in terms of panel rupture threshold. The GFRP V-structures exhibited lower transient deformation, but panel rupture on the rear face was observed at a lower charge mass. No tearing or rupture was observed in the steel V-structures tested at similar charge masses."]},{"key":"dc:title","label":"Title","values":["Response of composite and steel V-structures to localised air blast loading - Numerical and Experimental"]}]}],"canonical_facts":{"dc:contributor.advisor":["Von Klemperer, Christopher","Langdon Genevieve"],"dc:creator":["Shekhar, Vinay"],"dc:date.accessioned":["2024-07-04T14:08:26Z"],"dc:date.available":["2024-07-04T14:08:26Z"],"dc:date.issued":["2023"],"dc:description.abstract":["This research investigated the blast performance of Glass-Fibre Reinforced Polymer (GFRP) Vstructures compared to equivalent mass steel V-structures. The blast performance was measured in terms of three metrics, namely, impulse transferred, maximum mid-point deflection and permanent damage/deformation. A series of blast experiments were performed on manufactured GFRP and steel V-structures. The GFRP V-structures were made using Vacuum Infusion (VI), using a 400 g m−2 woven E-glass and a Prime 20LV resin with a Low Viscosity (LV) slow hardener. The steel V-structures were manufactured by laser cutting the flat panel profiles from a sheet of 2 mm thick DOMEX-700 MC sheet and then Computer Numerical Control (CNC) bending them to the desired profile. Three panel configurations were experimentally blast tested, namely, a 105° V-angle with a 32 mm V-tip radius, a 105° V-angle with a 62 mm V-tip radius and a 120° V-angle with a 32 mm V-tip radius. Blast tests were performed by detonating PE4 charges ranging from 10 g to 40 g at a Stand-Off Distance (SOD) of 34 mm. Digital Image Correlation (DIC) was used to track the transient deformation of the V-structures, while the final deformed profile of the V-structures was determined using a 3D scanner. A series of numerical simulations were also performed on the GFRP and steel V-structures. The simulations used quarter symmetry models to utilise the symmetry of the experimental setup. The material model parameters were obtained from a series of material tests carried out on GFRP and steel specimens. The simulations were validated against the experimental results for a number of test cases for impulse transfer, and transient and permanent deformation. The simulations were then extended to look at a range of V-tip radii, V-angles and charge masses, while the SOD was held constant. For the steel V-structures, the blast experiments found that increasing the V-tip radius and Vangle resulted in an increase in impulse transferred as well as transient and permanent mid-point deflection. This result was confirmed when the set of V-tip radii investigated was increased in the simulations. The trends in the results for the GFRP V-structures were similar to the equivalent steel plates. The delamination and total crack length were observed to increase with an increase in V-angle and charge mass. In general, the study found that GFRP V-structures were inferior to their equivalent mass steel V-structures in terms of panel rupture threshold. The GFRP V-structures exhibited lower transient deformation, but panel rupture on the rear face was observed at a lower charge mass. No tearing or rupture was observed in the steel V-structures tested at similar charge masses."],"dc:identifier.uri":["http://hdl.handle.net/11427/40343"],"dc:publisher.department":["Department of Mechanical Engineering"],"dc:subject":["Mechanical Engineering"],"dc:title":["Response of composite and steel V-structures to localised air blast loading - Numerical and Experimental"],"dc:type":["Thesis / Dissertation"],"dc:type.qualificationlevel":["Doctoral","PhD"]},"updated_at":"2026-07-22T22:23:12Z"}