A Non-linear Visco-elastic Model for Dynamic Finite Element Simulation of Bovine Cortical Bone
| dc.contributor.advisor | Ismail, Ernesto | |
| dc.contributor.advisor | Cloete, Trevor | |
| dc.contributor.author | Blignaut, Caitlyn | |
| dc.date.accessioned | 2021-07-07T10:36:23Z | |
| dc.date.available | 2021-07-07T10:36:23Z | |
| dc.date.issued | 2021 | |
| dc.date.updated | 2021-07-07T08:22:45Z | |
| dc.description.abstract | 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). | |
| dc.identifier.apacitation | Blignaut, C. (2021). <i>A Non-linear Visco-elastic Model for Dynamic Finite Element Simulation of Bovine Cortical Bone</i>. (). ,Faculty of Engineering and the Built Environment ,Department of Mechanical Engineering. Retrieved from http://hdl.handle.net/11427/33433 | en_ZA |
| dc.identifier.chicagocitation | Blignaut, Caitlyn. <i>"A Non-linear Visco-elastic Model for Dynamic Finite Element Simulation of Bovine Cortical Bone."</i> ., ,Faculty of Engineering and the Built Environment ,Department of Mechanical Engineering, 2021. http://hdl.handle.net/11427/33433 | en_ZA |
| dc.identifier.citation | Blignaut, C. 2021. A Non-linear Visco-elastic Model for Dynamic Finite Element Simulation of Bovine Cortical Bone. . ,Faculty of Engineering and the Built Environment ,Department of Mechanical Engineering. http://hdl.handle.net/11427/33433 | en_ZA |
| dc.identifier.ris | TY - Master Thesis AU - Blignaut, Caitlyn AB - 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). DA - 2021_ DB - OpenUCT DP - University of Cape Town KW - Cortical KW - bone KW - visco-elastic KW - non-linear KW - modelling KW - finite element analysis KW - constitutive model KW - intermediate strain rate LK - https://open.uct.ac.za PY - 2021 T1 - A Non-linear Visco-elastic Model for Dynamic Finite Element Simulation of Bovine Cortical Bone TI - A Non-linear Visco-elastic Model for Dynamic Finite Element Simulation of Bovine Cortical Bone UR - http://hdl.handle.net/11427/33433 ER - | en_ZA |
| dc.identifier.uri | http://hdl.handle.net/11427/33433 | |
| dc.identifier.vancouvercitation | Blignaut C. A Non-linear Visco-elastic Model for Dynamic Finite Element Simulation of Bovine Cortical Bone. []. ,Faculty of Engineering and the Built Environment ,Department of Mechanical Engineering, 2021 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/33433 | en_ZA |
| dc.language.rfc3066 | eng | |
| dc.publisher.department | Department of Mechanical Engineering | |
| dc.publisher.faculty | Faculty of Engineering and the Built Environment | |
| dc.subject | Cortical | |
| dc.subject | bone | |
| dc.subject | visco-elastic | |
| dc.subject | non-linear | |
| dc.subject | modelling | |
| dc.subject | finite element analysis | |
| dc.subject | constitutive model | |
| dc.subject | intermediate strain rate | |
| dc.title | A Non-linear Visco-elastic Model for Dynamic Finite Element Simulation of Bovine Cortical Bone | |
| dc.type | Master Thesis | |
| dc.type.qualificationlevel | Masters | |
| dc.type.qualificationlevel | MSc |