The numerical modelling of transformation induced plasticity in the deep drawing of stainless steel

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dc.contributor.advisorMartin, J Ben_ZA
dc.contributor.authorWard, John Douglas Bainen_ZA
dc.date.accessioned2016-03-28T14:38:42Z
dc.date.available2016-03-28T14:38:42Z
dc.date.issued1994en_ZA
dc.description.abstractSheet metal forming processes are an important part of many manufacturing operations today. The numerical simulation of these processes has become an important aspect in the design of the processes and in the understanding of the material forming itself. This thesis document describes the development and formulation of a material model which was used in the numerical simulation of deep drawing problems. The purpose of the material model was to predict the formation of martensite during the plastic straining of metastable austenitic stainless steel and the effect of the martensite formation on the plasticity of the steel. The model was developed from existing work as a modified von Mises isotropic hardening elastic-plastic algorithm. The algorithm was implemented as the subroutine UMAT in the finite element program ABAQUS. Finite element simulations employing the material model were performed on two axisymmetric deep drawing examples. The finite element analysis was performed as a coupled displacement-temperature analysis. The simulations produced results which predicted the distribution of various material state variables such as the volume fraction of martensite, plastic strain, yield stress and temperature in the formed component. The results were consistent with what is intuitively expected from the physics of the problem. They were able to explain phenomena observed in physical tests such as the location of failures in the formed components and the occurrence of delayed cracking. It is concluded that the model was successful in providing qualitative information on the distribution of martensite in components formed by deep drawing. These predictions were for a broad range of stainless steel behaviour. However, extensions to the model are required to be able to make accurate quantitative predictions on the formation of martensite in specific materials.en_ZA
dc.identifier.apacitationWard, J. D. B. (1994). <i>The numerical modelling of transformation induced plasticity in the deep drawing of stainless steel</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering. Retrieved from http://hdl.handle.net/11427/18306en_ZA
dc.identifier.chicagocitationWard, John Douglas Bain. <i>"The numerical modelling of transformation induced plasticity in the deep drawing of stainless steel."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering, 1994. http://hdl.handle.net/11427/18306en_ZA
dc.identifier.citationWard, J. 1994. The numerical modelling of transformation induced plasticity in the deep drawing of stainless steel. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Ward, John Douglas Bain AB - Sheet metal forming processes are an important part of many manufacturing operations today. The numerical simulation of these processes has become an important aspect in the design of the processes and in the understanding of the material forming itself. This thesis document describes the development and formulation of a material model which was used in the numerical simulation of deep drawing problems. The purpose of the material model was to predict the formation of martensite during the plastic straining of metastable austenitic stainless steel and the effect of the martensite formation on the plasticity of the steel. The model was developed from existing work as a modified von Mises isotropic hardening elastic-plastic algorithm. The algorithm was implemented as the subroutine UMAT in the finite element program ABAQUS. Finite element simulations employing the material model were performed on two axisymmetric deep drawing examples. The finite element analysis was performed as a coupled displacement-temperature analysis. The simulations produced results which predicted the distribution of various material state variables such as the volume fraction of martensite, plastic strain, yield stress and temperature in the formed component. The results were consistent with what is intuitively expected from the physics of the problem. They were able to explain phenomena observed in physical tests such as the location of failures in the formed components and the occurrence of delayed cracking. It is concluded that the model was successful in providing qualitative information on the distribution of martensite in components formed by deep drawing. These predictions were for a broad range of stainless steel behaviour. However, extensions to the model are required to be able to make accurate quantitative predictions on the formation of martensite in specific materials. DA - 1994 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1994 T1 - The numerical modelling of transformation induced plasticity in the deep drawing of stainless steel TI - The numerical modelling of transformation induced plasticity in the deep drawing of stainless steel UR - http://hdl.handle.net/11427/18306 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/18306
dc.identifier.vancouvercitationWard JDB. The numerical modelling of transformation induced plasticity in the deep drawing of stainless steel. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering, 1994 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/18306en_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 numerical modelling of transformation induced plasticity in the deep drawing of stainless steelen_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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