Isotropic octet-truss lattice structure design and anisotropy control strategies for implant application

Jiawei Feng; Bo Liu; Zhiwei Lin; Jianzhong Fu

Materials & Design (May 2021)

Isotropic octet-truss lattice structure design and anisotropy control strategies for implant application

Jiawei Feng,
Bo Liu,
Zhiwei Lin,
Jianzhong Fu

Affiliations

Jiawei Feng: State Key Laboratory of Fluid Power and Mechatronic Systems, College of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China; Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province, College of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China; Corresponding author at: State Key Laboratory of Fluid Power and Mechatronic Systems, College of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China
Bo Liu: State Key Laboratory of Fluid Power and Mechatronic Systems, College of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China; Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province, College of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China
Zhiwei Lin: State Key Laboratory of Fluid Power and Mechatronic Systems, College of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China; Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province, College of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China
Jianzhong Fu: State Key Laboratory of Fluid Power and Mechatronic Systems, College of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China; Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province, College of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China

Journal volume & issue: Vol. 203
p. 109595

Abstract

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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%.

Published in Materials & Design

ISSN: 0264-1275 (Print); 1873-4197 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.journals.elsevier.com/materials-and-design

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