The response of impulsively loaded sandwich plates

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dc.contributor.advisorNurick, Gerald Nen_ZA
dc.contributor.authorFarrow, Gary Herberten_ZA
dc.date.accessioned2016-03-28T14:38:37Z
dc.date.available2016-03-28T14:38:37Z
dc.date.issued1995en_ZA
dc.description.abstractThis thesis describes a numerical study of the response of impulsively loaded circular sandwich plates using the general purpose finite element programme called ABAQUS. The sandwich plate studied consists of three layers. The two outer layers are of mild steel and the centre layer, or core, is of air. Because of this configuration, the analysis is split into two sections. The first is the study of impulsively loaded circular single plates and the second is the study of the interaction of the outer layers of the sandwich plate on each other. The plates are analysed in the impulse range that results in large plastic deformations known as Mode I Failure. Mode II and III failure of the plates, where failure by tearing occurs, is omitted. The results of the single plate analysis are compared to experimental and analytical work. Criteria for comparison include mid-plate deflections, strain rate dependence, strain predictions, plate thinning, deformation shape and response time. The results of the sandwich plate analysis are compared to experimental data and the criteria for comparison include mid-plate deflections and the diameter of the contact area of the two outer layers. Other aspects of the plate behaviour such as response times and the amount of strain energy absorbed are also discussed. The explicit integration scheme is considered the best finite element solution method to use for this dynamic response problem. The pressure loading model is found to give the best correlation with experimental data while velocity loading models tend to result in instabilities in the explicit solution scheme. The presented results for both the single plates and the sandwich plates show good correlation with the experimental data. In the case of the sandwich plates, the predicted contact diameters show good correlation with the experimental work. The phases of deformation evident in the sandwich plate experimental work are not evident in the presented results, while the mid plate deflection predictions show correct trends, but over estimate the experimental data.en_ZA
dc.identifier.apacitationFarrow, G. H. (1995). <i>The response of impulsively loaded sandwich plates</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering. Retrieved from http://hdl.handle.net/11427/18303en_ZA
dc.identifier.chicagocitationFarrow, Gary Herbert. <i>"The response of impulsively loaded sandwich plates."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering, 1995. http://hdl.handle.net/11427/18303en_ZA
dc.identifier.citationFarrow, G. 1995. The response of impulsively loaded sandwich plates. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Farrow, Gary Herbert AB - This thesis describes a numerical study of the response of impulsively loaded circular sandwich plates using the general purpose finite element programme called ABAQUS. The sandwich plate studied consists of three layers. The two outer layers are of mild steel and the centre layer, or core, is of air. Because of this configuration, the analysis is split into two sections. The first is the study of impulsively loaded circular single plates and the second is the study of the interaction of the outer layers of the sandwich plate on each other. The plates are analysed in the impulse range that results in large plastic deformations known as Mode I Failure. Mode II and III failure of the plates, where failure by tearing occurs, is omitted. The results of the single plate analysis are compared to experimental and analytical work. Criteria for comparison include mid-plate deflections, strain rate dependence, strain predictions, plate thinning, deformation shape and response time. The results of the sandwich plate analysis are compared to experimental data and the criteria for comparison include mid-plate deflections and the diameter of the contact area of the two outer layers. Other aspects of the plate behaviour such as response times and the amount of strain energy absorbed are also discussed. The explicit integration scheme is considered the best finite element solution method to use for this dynamic response problem. The pressure loading model is found to give the best correlation with experimental data while velocity loading models tend to result in instabilities in the explicit solution scheme. The presented results for both the single plates and the sandwich plates show good correlation with the experimental data. In the case of the sandwich plates, the predicted contact diameters show good correlation with the experimental work. The phases of deformation evident in the sandwich plate experimental work are not evident in the presented results, while the mid plate deflection predictions show correct trends, but over estimate the experimental data. DA - 1995 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1995 T1 - The response of impulsively loaded sandwich plates TI - The response of impulsively loaded sandwich plates UR - http://hdl.handle.net/11427/18303 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/18303
dc.identifier.vancouvercitationFarrow GH. The response of impulsively loaded sandwich plates. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering, 1995 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/18303en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Mechanical Engineeringen_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherMechanical Engineeringen_ZA
dc.titleThe response of impulsively loaded sandwich platesen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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