Large deformations of thin plates subjected to impulsive loading

 

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dc.contributor.author Nurick, Gerald N en_ZA
dc.date.accessioned 2014-09-05T12:38:43Z
dc.date.available 2014-09-05T12:38:43Z
dc.date.issued 1987 en_ZA
dc.identifier.citation Nurick, G. 1987. Large deformations of thin plates subjected to impulsive loading. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/6923
dc.description Includes bibliographical references. en_ZA
dc.description.abstract The dynamic response of structures subjected to blast and impact loading has been obtained relatively simply using rigid-plastic or rigid-viscoplastic material idealisations. It is essential, however, that the predictions of these idealised theories should be checked against experimental results, and over the past twenty years several experimental studies have been carried out. This thesis describes a series of experiments on fully clamped Circular, square and rectangular steel plates. The final midpoint deflections measured were between 3 and 12 plate thicknesses: and the deflection time history was measured using a light interference technique. While the deflection-time history was being recorded. the impulse was simultaneously being measured by means of a ballistic pendulum upon which the plates were attached. The impulse was provided by sheet explosive which was arranged in such a way that the plate was subjected to a uniformly distributed impulse. In addition an extension of a mode approximation method, based on the assumption that membrane stresses predominate, is presented. This method assumes that the material behaviour can be modelled as rigid-viscoplastic. and that at any instant the shapes of the displacement and the velocity field are the same. Points on the plate surface were first assumed to displace perpendicular to the initial surface: this assumption was then relaxed to permit points to move perpendicular to the current surface. In both cases. the predicted transverse displacements agreed well with the experimental data. The predicted radial strain distribution exhibited trends similar to the experimental data in the case where lateral displacements were modelled. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Mechanical Engineering en_ZA
dc.title Large deformations of thin plates subjected to impulsive loading en_ZA
dc.type Doctoral Thesis
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Engineering and the Built Environment
dc.publisher.department Department of Mechanical Engineering en_ZA
dc.type.qualificationlevel Doctoral
dc.type.qualificationname PhD en_ZA
uct.type.filetype Text
uct.type.filetype Image
dc.identifier.apacitation Nurick, G. N. (1987). <i>Large deformations of thin plates subjected to impulsive loading</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering. Retrieved from http://hdl.handle.net/11427/6923 en_ZA
dc.identifier.chicagocitation Nurick, Gerald N. <i>"Large deformations of thin plates subjected to impulsive loading."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering, 1987. http://hdl.handle.net/11427/6923 en_ZA
dc.identifier.vancouvercitation Nurick GN. Large deformations of thin plates subjected to impulsive loading. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering, 1987 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/6923 en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Nurick, Gerald N AB - The dynamic response of structures subjected to blast and impact loading has been obtained relatively simply using rigid-plastic or rigid-viscoplastic material idealisations. It is essential, however, that the predictions of these idealised theories should be checked against experimental results, and over the past twenty years several experimental studies have been carried out. This thesis describes a series of experiments on fully clamped Circular, square and rectangular steel plates. The final midpoint deflections measured were between 3 and 12 plate thicknesses: and the deflection time history was measured using a light interference technique. While the deflection-time history was being recorded. the impulse was simultaneously being measured by means of a ballistic pendulum upon which the plates were attached. The impulse was provided by sheet explosive which was arranged in such a way that the plate was subjected to a uniformly distributed impulse. In addition an extension of a mode approximation method, based on the assumption that membrane stresses predominate, is presented. This method assumes that the material behaviour can be modelled as rigid-viscoplastic. and that at any instant the shapes of the displacement and the velocity field are the same. Points on the plate surface were first assumed to displace perpendicular to the initial surface: this assumption was then relaxed to permit points to move perpendicular to the current surface. In both cases. the predicted transverse displacements agreed well with the experimental data. The predicted radial strain distribution exhibited trends similar to the experimental data in the case where lateral displacements were modelled. DA - 1987 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1987 T1 - Large deformations of thin plates subjected to impulsive loading TI - Large deformations of thin plates subjected to impulsive loading UR - http://hdl.handle.net/11427/6923 ER - en_ZA


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