Isotropic octet-truss lattice structure design and anisotropy control strategies for implant application
Isotropic octet-truss lattice structure design and anisotropy control strategies for implant application
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DOI：
10.1016/j.matdes.2021.109595
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发表时间：
2021-02-22
影响因子：
8.4
通讯作者：
Fu, Jianzhong
中科院分区：
文献类型：
--
作者：
Feng, Jiawei;Liu, Bo;Fu, Jianzhong
在骨植入领域，对具有合适的力学性能和孔隙率的各向同性晶格有很大的需求。本文提出了两种各向同性晶格结构设计和各向异性控制策略。获得各向同性网格结构的第一种方法是将十字截头体与八角桁架结构相结合，采用联合收割机。然后，可以通过改变锥台参数来调整各向异性。第二种策略是在正常晶格空间中生成层次结构，通过改变内外直径来实现晶格各向异性控制。利用均匀化方法和有限元分析，建立了弹性模量、各向异性与晶格参数之间的关系。在此基础上，可以得到具有所需弹性模量和各向同性的晶格结构。此外，本研究将这两种方法所获得的各向同性晶格结构应用于髋臼杯植入物。实验结果表明，与普通八棱桁架种植体相比，所设计的网格种植体的弹性模量波动明显减小。不同方向弹性模量的标准差降低了约80%。(c)2021年，任作者。由Elsevier Ltd.发布。这是CC BY许可下的开放获取文章（http：//creativecommons.org/licenses/by/4.0/）。
In the field of bone implantation, there is a large demand for isotropic lattice with appropriate mechanical properties and porosity. Two isotropic lattice structure design and anisotropy control strategies are proposed in this work. The first way to acquire isotropic lattice structures is to combine the cross-frustum with octet-truss structure. Then the anisotropy can be adjusted by changing the frustum parameters. The second strategy is implemented in the space of normal lattice to generate hierarchical structures to achieve lattice anisotropy control by changing the inner and outer diameters. In virtue of homogenization method and finite element analysis (FEA), the relationship between elastic modulus, anisotropy and lattice parameters can be established. Based on that, the lattice structures with required elastic modulus and isotropy can be obtained. In addition, the isotropic lattice structures acquired by these two methods are applied as acetabular cup implant in this work. Compared with normal octet-truss, experimental results validate that the elastic modulus of designed lattice implant fluctuates significantly smaller. The standard deviation of elastic modulus in different directions is reduced by about 80%.(c) 2021 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http:// creativecommons.org/licenses/by/4.0/).