Diagonal-symmetrical and Midline-symmetrical Unit Cells with Same Porosity for Bone Implant: Mechanical Properties Evaluation

doi:https://doi.org/10.1007/s42235-019-0038-z

Journal of Bionic Engineering ›› 2019, Vol. 16 ›› Issue (3): 468-479.doi: https://doi.org/10.1007/s42235-019-0038-z

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Diagonal-symmetrical and Midline-symmetrical Unit Cells with Same Porosity for Bone Implant: Mechanical Properties Evaluation

Jian Li1,2,3, Diansheng Chen1,3*, Yingying Zhang2, Yan Yao3,4, Zhongjun Mo2, Lizhen Wang3,4, Yubo Fan2,3,4*

1. Robotic Institute, Beihang University, Beijing 100191, China
2. Beijing Key Laboratory of Rehabilitation Technical Aids for Old-Age and Disability, and Key Laboratory of Rehabilitation Aids Technology and System of the Ministry of Civil Affairs, National Research Center for Rehabilitation Technical Aids,
Beijing 100176, China
3. Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing 100191, China
4. Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical
Engineering, Beihang University, Beijing 100191, China

Received:2018-06-04 Revised:2019-04-04 Accepted:2019-04-04 Online:2019-05-10 Published:2019-06-14
Contact: Yubo Fan, Diansheng Chen E-mail:yubofan@buaa.edu.cn, chends@buaa.edu.cn
About author:Jian Li1,2,3, Diansheng Chen1,3*, Yingying Zhang2, Yan Yao3,4, Zhongjun Mo2, Lizhen Wang3,4, Yubo Fan2,3,4*

Abstract

Abstract: In this study, mechanical properties of bionic porous structures with diagonal-symmetrical and midline-symmetrical unit cells were studied when the porosities were same. Three typical unit cells (Diamond (DO), Rhombic Dodecahedron (RD), and Octet Truss (OT)) were selected, in which DO has diagonal-symmetrical shape, while RD and OT share midline-symmetrical structure. Based on the same porosity, corresponding models were designed, and Ti6Al4V samples were manufactured by electron beam melting. Then, using Me-chanical Properties Testing (MPT) and Finite Element Analysis (FEA) methodologies, mechanical properties and transmissions of dif-ferent porous structures were evaluated. Besides, composition and details before and after printing were analyzed with Energy Dispersive Spectrometer (EDS), X-ray diffraction (XRD) and Scanning Electron Microscope (SEM). MPT results showed that midline-symmetrical shape would have superior compressive performance than diagonal-symmetrical shape, but opposite trend for the torsion performance, which were in line with FEA prediction. Furthermore, effective modulus of DO, RD and OT were 2.59 GPa, 4.89 GPa, and 1.77 GPa, approximating the mechanical properties of human bones. Additionally, manufacturing defects and discrepancies between FEA and MPT were found. This study would provide great helps for unit cell selection and initial mechanical properties matching for optimum bone implants.

Key words: bionic design, porous implant, mechanical properties, unit cell, additive manufacturing, 3D printing

Jian Li, Diansheng Chen, Yingying Zhang, Yan Yao, Zhongjun Mo, Lizhen Wang, Yubo Fan, . Diagonal-symmetrical and Midline-symmetrical Unit Cells with Same Porosity for Bone Implant: Mechanical Properties Evaluation[J].Journal of Bionic Engineering, 2019, 16(3): 468-479.

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