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A Non-linear Visco-elastic Model for Dynamic Finite Element Simulation of Bovine Cortical Bone
Modelling and simulation of the human body during an impact situation such as a car accident, can lead to better designed safety features on vehicles. In order to achieve this, investigation into the material properties and the creation of a numerical model of cortical bone is needed. One approach t...
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| Format: | Thesis |
| Language: | English |
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Department of Mechanical Engineering
2021
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| _version_ | 1867614293636153344 |
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| access_status_str | Open Access |
| author | Blignaut, Caitlyn |
| author2 | Ismail, Ernesto |
| author_browse | Blignaut, Caitlyn Ismail, Ernesto |
| author_facet | Ismail, Ernesto Blignaut, Caitlyn |
| author_sort | Blignaut, Caitlyn |
| collection | Thesis |
| description | Modelling and simulation of the human body during an impact situation such as a car accident, can lead to better designed safety features on vehicles. In order to achieve this, investigation into the material properties and the creation of a numerical model of cortical bone is needed. One approach to creating a material model of cortical bone suitable for these situations is to describe the material model as visco-elastic, as reported by Shim et al. [1], Bekker et al. [2] and Cloete et al. [3]. The work by Shim et al. and Bekker et al. developed three-dimensional models, but do not accurately capture the transition in behaviour in the intermediate strain rate region, while Cloete et al. developed a phenomenological model which captures the intermediate strain rate behaviour in one dimension. This work aims to verify and extend these models. The intermediate strain rate regime (1 s−1 to 100 s−1 ) is of particular interest because it is a key characteristic of the behaviour of cortical bone and several studies have been conducted to gather experimental data in this region [3, 4, 5, 6]. The behaviour can be captured using non-linear viscoelastic models. This dissertation focuses on the development and implementation of a material model of cortical bone based on non-linear visco-elastic models to capture the intermediate strain rate regime behaviour. The material model was developed using uni-axial test results from cortical bone. The model by Cloete et al. has been improved and extended, and issues of local and global strain rate with regards to the viscosity have been clarified. A hereditary integral approach was taken in the analysis and implementation of discrete models and was found to be consistent with mathematical models. The model developed was extended to three dimensions in a manner similar to that of Shim et al. and Bekker et al. for implementation in commercial finite element software (LS-Dyna and Abaqus). |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/33433 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:49:44.794Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2021 |
| publishDateRange | 2021 |
| publishDateSort | 2021 |
| publisher | Department of Mechanical Engineering |
| publisherStr | Department of Mechanical Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/33433 A Non-linear Visco-elastic Model for Dynamic Finite Element Simulation of Bovine Cortical Bone Blignaut, Caitlyn Ismail, Ernesto Cloete, Trevor Cortical bone visco-elastic non-linear modelling finite element analysis constitutive model intermediate strain rate Modelling and simulation of the human body during an impact situation such as a car accident, can lead to better designed safety features on vehicles. In order to achieve this, investigation into the material properties and the creation of a numerical model of cortical bone is needed. One approach to creating a material model of cortical bone suitable for these situations is to describe the material model as visco-elastic, as reported by Shim et al. [1], Bekker et al. [2] and Cloete et al. [3]. The work by Shim et al. and Bekker et al. developed three-dimensional models, but do not accurately capture the transition in behaviour in the intermediate strain rate region, while Cloete et al. developed a phenomenological model which captures the intermediate strain rate behaviour in one dimension. This work aims to verify and extend these models. The intermediate strain rate regime (1 s−1 to 100 s−1 ) is of particular interest because it is a key characteristic of the behaviour of cortical bone and several studies have been conducted to gather experimental data in this region [3, 4, 5, 6]. The behaviour can be captured using non-linear viscoelastic models. This dissertation focuses on the development and implementation of a material model of cortical bone based on non-linear visco-elastic models to capture the intermediate strain rate regime behaviour. The material model was developed using uni-axial test results from cortical bone. The model by Cloete et al. has been improved and extended, and issues of local and global strain rate with regards to the viscosity have been clarified. A hereditary integral approach was taken in the analysis and implementation of discrete models and was found to be consistent with mathematical models. The model developed was extended to three dimensions in a manner similar to that of Shim et al. and Bekker et al. for implementation in commercial finite element software (LS-Dyna and Abaqus). 2021-07-07T10:36:23Z 2021-07-07T10:36:23Z 2021 2021-07-07T08:22:45Z Master Thesis Masters MSc http://hdl.handle.net/11427/33433 eng application/pdf Department of Mechanical Engineering Faculty of Engineering and the Built Environment |
| spellingShingle | Cortical bone visco-elastic non-linear modelling finite element analysis constitutive model intermediate strain rate Blignaut, Caitlyn A Non-linear Visco-elastic Model for Dynamic Finite Element Simulation of Bovine Cortical Bone |
| thesis_degree_str | Master's |
| title | A Non-linear Visco-elastic Model for Dynamic Finite Element Simulation of Bovine Cortical Bone |
| title_full | A Non-linear Visco-elastic Model for Dynamic Finite Element Simulation of Bovine Cortical Bone |
| title_fullStr | A Non-linear Visco-elastic Model for Dynamic Finite Element Simulation of Bovine Cortical Bone |
| title_full_unstemmed | A Non-linear Visco-elastic Model for Dynamic Finite Element Simulation of Bovine Cortical Bone |
| title_short | A Non-linear Visco-elastic Model for Dynamic Finite Element Simulation of Bovine Cortical Bone |
| title_sort | non linear visco elastic model for dynamic finite element simulation of bovine cortical bone |
| topic | Cortical bone visco-elastic non-linear modelling finite element analysis constitutive model intermediate strain rate |
| url | http://hdl.handle.net/11427/33433 |
| work_keys_str_mv | AT blignautcaitlyn anonlinearviscoelasticmodelfordynamicfiniteelementsimulationofbovinecorticalbone AT blignautcaitlyn nonlinearviscoelasticmodelfordynamicfiniteelementsimulationofbovinecorticalbone |