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Open AccessArticle

Design and Characterization of Sheet-Based Gyroid Porous Structures with Bioinspired Functional Gradients

1
School of Mechanical Engineering and Mechanics, Ningbo University, Ningbo 315211, China
2
State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China
*
Authors to whom correspondence should be addressed.
Materials 2020, 13(17), 3844; https://doi.org/10.3390/ma13173844
Received: 13 August 2020 / Revised: 27 August 2020 / Accepted: 28 August 2020 / Published: 31 August 2020
(This article belongs to the Section Biomaterials)
A new type of sheet porous structures with functionally gradients based on triply periodic minimal surfaces (TPMS) is proposed for designing bone scaffolds. The graded structures were generated by constructing branched features with different number of sheets. The design of the structure was formulated mathematically and five types of porous structure with different structural features were used for investigation. The relative density (RD) and surface area to volume (SA/V) ratio of the samples were analyzed using a slice-based approach to confirm their relationships with design parameters. All samples were additively manufactured using selective laser melting (SLM), and their physical morphologies were observed and compared with the designed models. Compression tests were adopted to study the mechanical properties of the proposed structure from the obtained stress–strain curves. The results reveal that the proposed branched-sheet structures could enhance and diversify the physical and mechanical properties, indicating that it is a potential method to tune the biomechanical properties of porous scaffolds for bone tissue engineering (TE). View Full-Text
Keywords: triply periodic minimal surfaces; branched sheet structures; functionally gradients; surface area to volume ratio; mechanical properties triply periodic minimal surfaces; branched sheet structures; functionally gradients; surface area to volume ratio; mechanical properties
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MDPI and ACS Style

Jin, Y.; Kong, H.; Zhou, X.; Li, G.; Du, J. Design and Characterization of Sheet-Based Gyroid Porous Structures with Bioinspired Functional Gradients. Materials 2020, 13, 3844.

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