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首页> 外文期刊>Applied Mathematical Modelling >Development of porous implants with non-uniform mechanical properties distribution based on CT images
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Development of porous implants with non-uniform mechanical properties distribution based on CT images

机译：基于CT图像的非均匀机械性能分布的多孔植入物的发展

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摘要

In this study, the mechanical properties (elastic modulus, yield stress, and Poisson's ratio) of rhombic dodecahedron (RD) unit cell has been studied analytically and numerically. For the analytical study, two well-known beam theories, namely Euler Bernoulli and Timo-shenko, have been implemented. For validating the analytical relationships, finite element model of unit cell with repetitive boundary condition has been created. Moreover, the experimental results of recent studies have been used for validation. The results showed that the presented analytical relationships for RD lattice structure have good agreement with numerical and experimental results in all the relative densities particularly in lower relative densities. Besides, the analytical relationships based on Timoshenko theory showed closer results with numerical/experimental data. The derived analytical relationships for RD as well as the data extracted from CT scan images of a femur bone, were combined and used to create a porous femur implant model. The stress and strain distributions of the porous femur model under typical static compressive load due to human weight as well as axial rigidity of the model in the same loading conditions have been obtained and compared with the experimental results from other studies. The stress and strain distributions of the porous femur implant model based on RD unit cells, as well as its axial rigidity, showed good agreement with the results obtained for human femur.
机译：在该研究中，在分析和数值上研究了菱形十二锭（RD）单元电池的机械性能（弹性模量，屈服应力和泊松比）。对于分析研究，已经实施了两个众所周知的光束理论，即Euler Bernoulli和Timo-Shenko。为了验证分析关系，已经创建了具有重复边界条件的单元单元的有限元模型。此外，最近研究的实验结果已被用于验证。结果表明，RD晶格结构的呈现关系具有良好的一致性，与较低相对密度的所有相对密度的数值和实验结果良好。此外，基于Timoshenko理论的分析关系显示了数控/实验数据的更接近的结果。合并并用于产生股骨骨的CT扫描图像的RD的衍生分析关系，并用于产生多孔股骨植入模型。已经获得了同一负载条件下典型静态压缩负载下的多孔股骨模型的应力和应变分布，并与其他研究的实验结果进行了比较。基于RD单元电池的多孔股骨植入物模型的应力和应变分布，以及其轴向刚度，表现出良好的人类股骨的结果。

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  • 来源
    《Applied Mathematical Modelling》 |2020年第7期|801-823|共23页
  • 作者

    N. Ghavidelnia; R. Hedayati; M. Sadighi; M. Mohammadi-Aghdam;

  • 作者单位

    Department of Mechanical Engineering Amirkabir University of Technology (Tehran Polytechnic) Hafez Aw Tehran Iran;

    Novel Aerospace Materials Group Faculty of Aerospace Engineering Delft University of Technology (TU Delft) Kluyverweg 1 2629 HS Delft the Netherlands;

    Department of Mechanical Engineering Amirkabir University of Technology (Tehran Polytechnic) Hafez Aw Tehran Iran;

    Department of Mechanical Engineering Amirkabir University of Technology (Tehran Polytechnic) Hafez Aw Tehran Iran;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Rhombic dodecahedron; Porous biomaterials; Additive manufacturing; Femur bone; CT scan;

    机译：菱形十二锭;多孔生物材料;添加剂制造;股骨骨;CT扫描;

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