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• W2330215487 abstract "Cortical bone tissue – one of the most intriguing materials found in nature –demonstrate some fascinating behaviours that have attracted great attentionof many researchers from all over the world. In contrast to engineeringmaterials, bone has its unique characters: it is a material that has bothsufficient stiffness and toughness to provide physical support and protectionto internal organs and yet adaptively balanced for its weight and functionalrequirements. Its structure and mechanical properties are of great importanceto the physiological functioning of the body. Still, our understanding on themechanical deformation processes of cortical bone tissue is rather limited.Penetration into a bone tissue is an intrinsic part of many clinical procedures,such as orthopaedic surgery, bone implant and repair operations. Thesuccess of bone-cutting surgery depends largely on precision of theoperation and the extent of damage it causes to the surrounding tissues. Theanisotropic behaviour of cortical bone acts as a distinctive protectivemechanism and increases the difficulty during cutting process. Acomprehensive understanding of deformation and damage mechanismsduring the cutting process is necessary for improving the operationalaccuracy and postoperative recovery of patients. However, the currentliterature on experimental results provides limited information aboutprocesses in the vicinity of the cutting tool-bone interaction zone; while;numerical models cannot fully describe the material anisotropy and the effectof damage mechanisms of cortical bone tissue. In addition, a conventionalfinite-element scheme faces numerical challenges due to large deformationand highly localised distortion in the process zone.This PhD project is aimed at bridging the gap in current lack of understandingon cutting-induced deformation and fracture processes in the cortical bonetissue through experimental and numerical approaches.A number of experimental studies were accomplished to characterise themechanical behaviour of bovine cortical bone tissue and to analysedeformation and damage mechanisms associated with the cutting process IIalong different bone axes in four anatomic cortices, namely, anterior,posterior, medial and lateral. These experiments included: (1) a Vickershardness test to provide initial assessments on deformation and damageprocesses in the cortical bone tissue under a concentrated compressive load;(2) uniaxial tension and compression tests, performed to understand theeffect of orientation and local variability of microstructure constituents on themacroscopic material properties of cortical bone; (3) fracture toughness tests,aimed at elucidating the anisotropic character of fracture toughness ofcortical bone and its various fracture toughness mechanisms in relation todifferent orientations; (4) penetration tests, conducted to evaluate andvalidate mechanisms involved in bone cutting as well as orientationassociated anisotropic deformation and damage processes at variousdifferent cortex positions. Information obtained in these experimental studieswas used to assist the development of advanced finite-element models: (1)the effective homogenised XFEM models developed in conjunction withthree-point bending test to represent a macroscopically, anisotropic elasticplasticfracture behaviour of cortical bone tissue; (2) three microstructuredXFEM models to further investigate the effect of the randomly distributedmicrostructural constituents on the local fracture process and the variability offracture toughness of cortical bone; (3) a novel finite-element modellingapproach encompassing both conventional and SPH elements, incorporatinganisotropic elastic-plastic material properties and progressive damage criteriato simulate large deformation and damage processes of cortical bone underpenetration. The established models can adequately and accurately reflectlarge deformations and damage processes during the penetration in bonecutting.The results of this study made valuable contributions to our existingunderstanding of the mechanics of cortical bone tissue and most importantlyto the understanding of its mechanical behaviours during the cutting process." @default.
• W2330215487 created "2016-06-24" @default.
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• W2330215487 date "2013-01-01" @default.
• W2330215487 modified "2023-09-26" @default.
• W2330215487 title "Cutting of cortical bone tissue: analysis of deformation and fracture process" @default.
• W2330215487 hasPublicationYear "2013" @default.
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