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| Finite Element Analysis of Mechanical Properties of Graded Sphere Porosity Structure with Different Pore Size Distributions |
| Shi Zhiliang1, Huang Chen1, Lu Xiaolong1, Li Feng2*, Sun Yunlong2 |
1(School of Mechanical and Electrical Engineering, Wuhan University of Technology, Wuhan 430070, China);
2(Tongji Medical College, Huazhong University of Science & Technology, Wuhan 430030, China) |
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Abstract To establish a three-dimensional finite element model of titanium alloy porous structure with the different pore size distributions and to implement the finite element mechanical analysis. The sphere, sphere_line, sphere_plane, sphere_point three-dimensional models of porous structure was created by software Rhino 5.0. The finite element analysis was implemented by Abaqus 6.1 to calculate the Von-Mises stress and maximum principal stress. Before calculated, The 200, 400, 600, 800, and 1000 N loading forces were applied to the upper surface, and the direction was vertically downward. The lower surface was selected as a fixed constraint. Under the same loading force, thesphere plane has the maximum principal stress and the maximum equivalent stress,followed were the sphere point gradient pore model and sphere line gradient pore model, the sphere without gradient pore model was the smallest. Among the four porous structures with different gradient pore size distributions, sphere has the lowest actual load and the best carrying capacity, the next was sphere line gradient hole structure and then sphere point. Sphere plane gradient pore structure had the maximum actual load, and its carrying capacity was worse than the three formers. Finally, the four models that were designed in this work were prepared by rapid prototyping to obtain the porous titanium alloy body, and the mechanical property test on these bodies was carried out. The conclusion verifies the reliability of numerical simulation results. The results of this research could be used to provide relevant reference and theoretical basis for porous titanium alloy implants and clinical applications.
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Received: 08 April 2018
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