Ma, Shuai, Tang, Qian, Zhu, Changbao, Wang, Fuyou, Feng, Qixiang, Song, Jun, Setchi, Rossitza  ORCID: https://orcid.org/0000-0002-7207-6544, Ma, Chenglong and Tao, Ran
2022.
Laser powder bed fusion-built Ti6Al4V bone scaffolds composed of sheet and strut-based porous structures: Morphology, mechanical properties, and biocompatibility.
Chinese Journal of Mechanical Engineering: Additive Manufacturing Frontiers
1
(4)
, 100051.
10.1016/j.cjmeam.2022.100051
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Abstract
Laser powder bed fusion (L-PBF)-built triply periodic minimal surface (TPMS) structures are designed by implicit functions and are endowed with superior characteristics, such as adjustable mechanical properties and light-weight features for bone repairing; thus, they are considered as potential candidates for bone scaffolds. Unfortunately, previous studies have mainly focused on different TPMS structures. The fundamental understanding of the differences between strut and sheet-based structures remains exclusive, where both were designed by one formula. This consequently hinders their practical applications. Herein, we compared the morphology, mechanical properties, and biocompatibility of sheet and strut-based structures. In particular, the different properties and in vivo bone repair effects of the two structures are uncovered. First, the morphology characteristics demonstrate that the manufacturing errors of sheet-based structures with diverse porosities are comparable, and semi-melting powders as well as the ball phenomenon are observed; in comparison, strut-based samples exhibit cracks and thickness shrinking. Second, the mechanical properties indicate that the sheet-based structures have a greater elastic modulus, energy absorption, and better repeatability compared to strut-based structures. Furthermore, layer-by-layer fracturing and diagonal shear failure modes are observed in strut-based and sheet-based structures, respectively. The in vivo experiment demonstrates enhanced bone tissues in the strut-based scaffold. This study significantly enriches our understanding of TPMS structures and provides significant insights in the design of bone scaffolds under various bone damaging conditions.
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Schools > Engineering |
| Additional Information: | License information from Publisher: LICENSE 1: URL: http://creativecommons.org/licenses/by-nc-nd/4.0/, Start Date: 2022-11-18 |
| Publisher: | Elsevier |
| ISSN: | 2772-6657 |
| Date of First Compliant Deposit: | 22 November 2022 |
| Date of Acceptance: | 13 September 2022 |
| Last Modified: | 05 Jan 2024 05:40 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/154414 |
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