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An experimental and theoretical study on the effect of strain rate on ductile damage
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-mechani...
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| Format: | Thesis |
| Language: | English |
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Blast Impact and Survivability Research Unit
2016
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| _version_ | 1867613300848590848 |
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| access_status_str | Open Access |
| author | Weyer, Matthew |
| author2 | Cloete, Trevor |
| author_browse | Cloete, Trevor Weyer, Matthew |
| author_facet | Cloete, Trevor Weyer, Matthew |
| author_sort | Weyer, Matthew |
| collection | Thesis |
| description | 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. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/20767 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:33:57.504Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | Blast Impact and Survivability Research Unit |
| publisherStr | Blast Impact and Survivability Research Unit |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/20767 An experimental and theoretical study on the effect of strain rate on ductile damage Weyer, Matthew Cloete, Trevor Govender, Reuben Ashley Blast phenomena Mechanical Engineering 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. 2016-07-26T12:14:25Z 2016-07-26T12:14:25Z 2016 Master Thesis Masters MSc http://hdl.handle.net/11427/20767 eng application/pdf Blast Impact and Survivability Research Unit Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Blast phenomena Mechanical Engineering Weyer, Matthew An experimental and theoretical study on the effect of strain rate on ductile damage |
| thesis_degree_str | Master's |
| title | An experimental and theoretical study on the effect of strain rate on ductile damage |
| title_full | An experimental and theoretical study on the effect of strain rate on ductile damage |
| title_fullStr | An experimental and theoretical study on the effect of strain rate on ductile damage |
| title_full_unstemmed | An experimental and theoretical study on the effect of strain rate on ductile damage |
| title_short | An experimental and theoretical study on the effect of strain rate on ductile damage |
| title_sort | experimental and theoretical study on the effect of strain rate on ductile damage |
| topic | Blast phenomena Mechanical Engineering |
| url | http://hdl.handle.net/11427/20767 |
| work_keys_str_mv | AT weyermatthew anexperimentalandtheoreticalstudyontheeffectofstrainrateonductiledamage AT weyermatthew experimentalandtheoreticalstudyontheeffectofstrainrateonductiledamage |