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An experimental investigation into the anisotropic behaviour of bovine femoral cortical bone

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dc.contributor.advisor Cloete, Trevor
dc.contributor.advisor Ismail, Ernesto Bram Roginsky, Andrew 2017-09-12T06:05:57Z 2017-09-12T06:05:57Z 2017 2017-09 2017 2017-07-14
dc.description.abstract To increase our level of knowledge of the human body for various applications, the behaviour of cortical bone needs to be understood. To understand and model the behaviour of cortical bone, knowledge of the strain rate dependent behaviour is required. Many authors have investigated these properties, however, the literature appears to be ambiguous and incomplete, with little focus being placed upon the intermediate strain rate regime (1s⁻¹ to 100s⁻¹). The ambiguity arises as each author presents an averaged data set which does not describe the level of scatter or precise testing methods, nor does it correspond with other authors work [33, 56, 27, 2, 62]. Furthermore, bone should display distinct anisotropic properties due to the microstructural layout. However, no author has published or recorded a complete data set detailing the anisotropy of bone across any species. The intermediate strain rate regime is of particular interest due to Paul [50], capturing a distinct transitional behaviour of cortical bone between low and high strain rates. The apparent lack in intermediate regime research is due to the difficulty in attaining constant strain rate testing conditions within this region using conventional methods. Consequently, due to the absence of data, no accurate model has been developed to simulate the behaviour observed. The focus of this dissertation will therefore be to redesign and fabricate the previously used intermediate strain rate testing device, provide an accurate data set across both quasi-static and dynamic regimes, and a phenomenological model which is able to capture this strain rate dependent behaviour. In order to develop an understanding of the scatter presented in each orientation, light microscopy, inverse light microscopy, and SEM of the specimens is performed. What is observed is that each orientation displays a distinct microstructural layout with fractures propagating in a distinctly different manner based on the strain rate regime. Furthermore, counter to previous findings, the strength of bone across a variety of samples does not appear consistent, however, the longitudinal and radial orientations still display strain rate sensitivity (per sample) which was captured using the improved phenomenological viscoelastic model. en_US
dc.description.sponsorship National Research Foundation en_US
dc.format.extent 186 p. en_US
dc.format.medium pdf en_US
dc.language.iso en en_US
dc.publisher University of Cape Town en_US
dc.relation.requires Adobe Acrobat Reader en_US
dc.relation.uri en_US
dc.rights University of Cape Town en_US
dc.subject Bovine cortical bone en_US
dc.subject Viscoelasticity en_US
dc.subject Quasi-static testing en_US
dc.subject Intermediate strain rate testing en_US
dc.subject Bone en_US
dc.subject Anisotropy en_US
dc.subject Experimental en_US
dc.subject Mechanical compliance en_US
dc.title An experimental investigation into the anisotropic behaviour of bovine femoral cortical bone en_US
dc.type Thesis en_US
dc.rights.holder University of Cape Town en_US
dc.contributor.orcid 0000-0002-7789-7333 en_US

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