| Issue |
MATEC Web Conf.
Volume 370, 2022
2022 RAPDASA-RobMech-PRASA-CoSAAMI Conference - Digital Technology in Product Development - The 23rd Annual International RAPDASA Conference joined by RobMech, PRASA and CoSAAMI
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|---|---|---|
| Article Number | 01002 | |
| Number of page(s) | 11 | |
| Section | Design and Additive Manufacturing of Titanium Parts Seminar | |
| DOI | https://doi.org/10.1051/matecconf/202237001002 | |
| Published online | 01 December 2022 | |
A numerical approach for designing functionally stiff triply-periodic-minimal-surface structures
1 Department of Mechanical and Mechatronic Engineering, University of Stellenbosch, South Africa, 21587612@sun.ac.za
2 Department of Mechanical and Mechatronic Engineering, University of Stellenbosch, South Africa, melzvanrooyen@sun.ac.za
3 Centre for Materials Engineering, University of Cape Town, South Africa, thorsten.becker@uct.ac.za
* Corresponding author: 21587612@sun.ac.za
Biomedical implants require stiffnesses matching those of the surrounding bone to avoid stress shielding. Triply-periodic-minimal-surface (TPMS) structures have shown promising characteristics in preventing stress shielding; however, they are limited in allowing for anisotropic stiffness properties that are typically inherent in bone. This paper presents an approach to simplifying a TPMS structure so that common geometries can be used to approximate it. The wall thickness is varied until the desired functional and directional stiffnesses are determined through finite element modelling. Validation of the finite element models is provided through the compression testing of laser powder bed fusion (LPBF) produced specimens. The displacement response to compression testing is presented along with the final structure, which closely matches the stiffness of bone. This approach has the potential to increase implant longevity and improve the lives of implant recipients.
© The Authors, published by EDP Sciences, 2022
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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