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Free boundary effects and representative volume elements in 3D printed Ti–6Al–4V gyroid structures

Published online by Cambridge University Press:  26 May 2020

Anh Pham ,
Cambre Kelly  and
Ken Gall
Anh Pham
Affiliation:
Department of Biomedical Engineering, Duke University, Durham, North Carolina, USA
Cambre Kelly*
Affiliation:
Department of Biomedical Engineering, Duke University, Durham, North Carolina, USA; and Department of Mechanical Engineering and Material Science, Duke University, Durham, North Carolina, USA
Ken Gall
Affiliation:
Department of Biomedical Engineering, Duke University, Durham, North Carolina, USA; and Department of Mechanical Engineering and Material Science, Duke University, Durham, North Carolina, USA
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The adoption of selective laser melting (SLM) for fabrication of porous titanium has resulted in many new investigations into the complex design parameters associated with porous architecture of high spatial resolution. The development of meta-materials has included research into the effects of unit cell architecture (strut versus sheet), porosity, pore size, and other factors on the performance of metallic scaffolds. The current study examined the interactive effects of varying the gyroid sheet unit cell size and overall specimen size on the compressive behavior of Ti–6Al–4V ELI porous scaffolds manufactured via SLM. The increasing unit cell size relative to specimen geometry was found to decrease the compressive strength and stiffness of the overall structure and shift the material fracture mode. The understanding of the relationship between unit cell size and specimen geometry can be used to optimize mechanical properties of implants with constrained volumes and pore/wall size requirements to optimize properties of porous titanium implants for strength and osseointegration.

Keywords

additive manufacturingTiporosity
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 19: Focus Issue: Porous Metals: From Nano to Macro , 14 October 2020 , pp. 2547 - 2555
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Copyright
Copyright © Materials Research Society 2020

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