Finite element analysis of Ti6Al4V porous structures for low-stiff hip implant application

Q3 Mathematics

International Journal for Simulation and Multidisciplinary Design Optimization Pub Date : 2021-01-01 DOI:10.1051/smdo/2021014

Porika Rakesh, Bidyut Pal

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引用次数: 0

Abstract

Solid metallic hip implants have much higher stiffness than the femur bone, causing stress-shielding and subsequent implant loosening. The development of low-stiff implants using metallic porous structures has been reported in the literature. Ti6Al4V alloy is a commonly used biomaterial for hip implants. In this work, Body-Center-Cubic (BCC), Cubic, and Spherical porous structures of four different porosities (82%, 76%, 70%, and 67%) were investigated to establish the range of ideal porosities of Ti6Al4V porous structures that can match the stiffness of the femur bone. The effective mechanical properties have been determined through Finite Element Analysis (FEA) under uniaxial compressive displacement of 0.32 mm. FEA predictions were validated with the analytical calculations obtained using Gibson and Ashby method. The effective mechanical properties of 82%, 76%, 70%, and 67% porous BCC and Cubic structures were found to match the mechanical properties of cortical bone closely. They were also well comparable to the Gibson-Ashby method-based calculations. BCC and Cubic porous structures with 67–82% porosity can mimic the stiffness of the femur bone and are suitable for low-stiff hip implant applications.

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Ti6Al4V多孔结构低刚度髋关节植入物的有限元分析

固体金属髋关节植入物比股骨具有更高的刚度，造成应力屏蔽和随后的植入物松动。文献中已经报道了使用金属多孔结构的低硬度植入物的发展。Ti6Al4V合金是一种常用的髋关节植入材料。在这项工作中，研究了四种不同孔隙率(82%，76%，70%和67%)的体-中心-立方(BCC)，立方和球形多孔结构，以建立能够匹配股骨刚度的Ti6Al4V多孔结构的理想孔隙率范围。在0.32 mm的单轴压缩位移下，通过有限元分析确定了其有效力学性能。用Gibson法和Ashby法得到的分析计算验证了有限元预测。82%、76%、70%和67%多孔BCC和立方结构的有效力学性能与皮质骨的力学性能非常接近。它们也很好地与基于吉布森-阿什比方法的计算相媲美。BCC和Cubic多孔结构具有67-82%的孔隙度，可以模拟股骨的刚度，适合于低刚度的髋关节植入物应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal for Simulation and Multidisciplinary Design Optimization Mathematics-Control and Optimization

CiteScore

2.00

自引率

0.00%

发文量

审稿时长

16 weeks

期刊介绍： The International Journal for Simulation and Multidisciplinary Design Optimization is a peer-reviewed journal covering all aspects related to the simulation and multidisciplinary design optimization. It is devoted to publish original work related to advanced design methodologies, theoretical approaches, contemporary computers and their applications to different fields such as engineering software/hardware developments, science, computing techniques, aerospace, automobile, aeronautic, business, management, manufacturing,... etc. Front-edge research topics related to topology optimization, composite material design, numerical simulation of manufacturing process, advanced optimization algorithms, industrial applications of optimization methods are highly suggested. The scope includes, but is not limited to original research contributions, reviews in the following topics: Parameter identification & Surface Response (all aspects of characterization and modeling of materials and structural behaviors, Artificial Neural Network, Parametric Programming, approximation methods,…etc.) Optimization Strategies (optimization methods that involve heuristic or Mathematics approaches, Control Theory, Linear & Nonlinear Programming, Stochastic Programming, Discrete & Dynamic Programming, Operational Research, Algorithms in Optimization based on nature behaviors,….etc.) Structural Optimization (sizing, shape and topology optimizations with or without external constraints for materials and structures) Dynamic and Vibration (cover modelling and simulation for dynamic and vibration analysis, shape and topology optimizations with or without external constraints for materials and structures) Industrial Applications (Applications Related to Optimization, Modelling for Engineering applications are very welcome. Authors should underline the technological, numerical or integration of the mentioned scopes.).