An experimental and theoretical study on the effect of strain rate on ductile damage

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dc.contributor.advisorCloete, Trevoren_ZA
dc.contributor.advisorGovender, Reuben Ashleyen_ZA
dc.contributor.authorWeyer, Matthewen_ZA
dc.date.accessioned2016-07-26T12:14:25Z
dc.date.available2016-07-26T12:14:25Z
dc.date.issued2016en_ZA
dc.description.abstractSimulation of fracture in ductile materials is a challenging problem, since it typically occurs at length scales that are orders of magnitude smaller than that of the structures in which the fracture is occurring and, hence, difficult to resolve . One approach is to avoid modelling the micro-mechanics of ductile fracture by describing the macroscopic effects of fracture using damage parameters. Damage in metals can be defined as a measure of discontinuous deformation of a body. Many numerical models include some measure of damage to predict when a material will fracture under certain conditions, however there is little consensus as to what measures and parameters will accurately predict the onset of fracture. Most notably, the effect of strain rate at the point of fracture is significant and must be taken into account. The literature indicates that in the quasistatic regime where inertial effects are negligible, an increase in strain rate increases the strain at fracture. However, the research conducted in this dissertation suggests the opposite is true. The aim of this research is to conduct further high strain rate ductile damage experiments so as to extend the available data set, and develop a pragmatic damage model to relate the plastic strain at fracture to material parameters such as triaxiality, lode angle and strain rate in a specimen, which is verified using experiments performed under various loading conditions and strain rates.en_ZA
dc.identifier.apacitationWeyer, M. (2016). <i>An experimental and theoretical study on the effect of strain rate on ductile damage</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Blast Impact and Survivability Research Unit. Retrieved from http://hdl.handle.net/11427/20767en_ZA
dc.identifier.chicagocitationWeyer, Matthew. <i>"An experimental and theoretical study on the effect of strain rate on ductile damage."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Blast Impact and Survivability Research Unit, 2016. http://hdl.handle.net/11427/20767en_ZA
dc.identifier.citationWeyer, M. 2016. An experimental and theoretical study on the effect of strain rate on ductile damage. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Weyer, Matthew AB - Simulation of fracture in ductile materials is a challenging problem, since it typically occurs at length scales that are orders of magnitude smaller than that of the structures in which the fracture is occurring and, hence, difficult to resolve . One approach is to avoid modelling the micro-mechanics of ductile fracture by describing the macroscopic effects of fracture using damage parameters. Damage in metals can be defined as a measure of discontinuous deformation of a body. Many numerical models include some measure of damage to predict when a material will fracture under certain conditions, however there is little consensus as to what measures and parameters will accurately predict the onset of fracture. Most notably, the effect of strain rate at the point of fracture is significant and must be taken into account. The literature indicates that in the quasistatic regime where inertial effects are negligible, an increase in strain rate increases the strain at fracture. However, the research conducted in this dissertation suggests the opposite is true. The aim of this research is to conduct further high strain rate ductile damage experiments so as to extend the available data set, and develop a pragmatic damage model to relate the plastic strain at fracture to material parameters such as triaxiality, lode angle and strain rate in a specimen, which is verified using experiments performed under various loading conditions and strain rates. DA - 2016 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2016 T1 - An experimental and theoretical study on the effect of strain rate on ductile damage TI - An experimental and theoretical study on the effect of strain rate on ductile damage UR - http://hdl.handle.net/11427/20767 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/20767
dc.identifier.vancouvercitationWeyer M. An experimental and theoretical study on the effect of strain rate on ductile damage. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Blast Impact and Survivability Research Unit, 2016 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/20767en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentBlast Impact and Survivability Research Uniten_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherBlast phenomenaen_ZA
dc.subject.otherMechanical Engineeringen_ZA
dc.titleAn experimental and theoretical study on the effect of strain rate on ductile damageen_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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