Design and performance evaluation of additively manufactured composite lattice structures of commercially pure Ti (CP-Ti)

Wei Xu, Aihua Yu, Xin Lu*, Maryam Tamaddon, Mengdi Wang, Jiazhen Zhang, Jianliang Zhang, Xuanhui Qu, Chaozong Liu, Bo Su

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

Abstract

Ti alloys with lattice structures are garnering more and more attention in the field of bone repair or regeneration due to their superior structural, mechanical, and biological properties. In this study, six types of composite lattice structures with different strut radius that consist of simple cubic (structure A), body-centered cubic (structure B), and edge-centered cubic (structure C) unit cells are designed. The designed structures are firstly simulated and analysed by the finite element (FE) method. Commercially pure Ti (CP-Ti) lattice structures with optimised unit cells and strut radius are then fabricated by selective laser melting (SLM), and the dimensions, microtopography, and mechanical properties are characterised. The results show that among the six types of composite lattice structures, combined BA, CA, and CB structures exhibit smaller maximum von-Mises stress, indicating that these structures have higher strength. Based on the fitting curves of stress/specific surface area versus strut radius, the optimised strut radius of BA, CA, and CB structures is 0.28, 0.23, and 0.30 mm respectively. Their corresponding compressive yield strength and compressive modulus are 42.28, 30.11, and 176.96 MPa, and 4.13, 2.16, and 7.84 GPa, respectively. The CP-Ti with CB unit structure presents a similar strength and compressive modulus to the cortical bone, which makes it a potential candidate for subchondral bone restorations.
Original languageEnglish
JournalBioactive Materials
Publication statusAccepted/In press - 22 Oct 2020

Keywords

  • composite lattice structure
  • finite element modelling
  • selective laser melting (SLM)
  • CP-Ti

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