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    The Behaviour of Scaffolds for Bone under Torsional Loading with Different Architectures; A Numerical Analysis
    (Institute of Electrical and Electronics Engineers Inc., 2020) Ali, D.
    Given that human bones are subjected to various loads during movement. Therefore, the scaffolds that they are designed for bone defects replacement should also be tested under the same loading conditions. In this study, the torsional behaviour of the scaffolds was investigated using four different lattice-based architectures. The scaffolds were designed in three porosity levels of 60%, 75% and 90%. Therefore, twelve models of the scaffolds were obtained. To determine their performance under torsional loading, the shear modulus of each model was calculated using finite element analysis. The results showed that in the scaffolds with lower porosity the scaffold's architecture does not play a main role in the shear modulus. However, in scaffolds with a porosity of 90%, the shear modulus was affected by the architecture of the scaffold. For example, a scaffold with an octet structure showed three times higher shear modulus in compare to a scaffold with a truncated-octahedron architecture. As a conclusion in the design of scaffolds with high porosity, scaffold architecture plays an important role in its torsional behaviour and should be considered as a design parameter. The results of this study showed that the torsional behaviour of scaffolds depends on both porosity and architecture. © 2020 IEEE.
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    Effect of Blood Viscosity on Pressure and Shear Stress on the Walls of an Artery with Stenosis
    (Institute of Electrical and Electronics Engineers Inc., 2018) Ali, D.; Onel, S.
    Blood flow dynamics in arteries with stenosis is a critical issue. In this study, the effect of blood viscosity on the pressure and wall shear stress that form on the walls of an artery with a 70% reduced cross-sectional area was investigated using computational fluid dynamics. It was observed that the increase in blood viscosity caused an increase in the pressure and shear stress on the walls of normal arteries and those with stenosis. It has been shown that these parameters increase linearly with increasing blood viscosity in a normal artery and behave nonlinearly along the different regions of an artery with stenosis. © 2018 IEEE.