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Optimisation of selective laser melted Ti6Al4V functionally graded lattice structures accounting for structural safety
File(s)
materials-15-09072.pdf (9.22 MB)
Published version
Author(s)
Zhu, Lei
Wang, Xiaoyang
Sun, Liao
Hu, Quandong
Li, Nan
Type
Journal Article
Abstract
This paper presents a new framework for lightweight optimisation of functionally graded lattice structures (FGLSs) with a particular focus on enhancing and guaranteeing structural safety through three main contributions. Firstly, a design strategy of adding fillets to the joints of body-centred cubic (BCC) type lattice cells was proposed to improve the effective yield stress of the lattices. Secondly, effective properties of lattice metamaterials were experimentally characterised by conducting quasi-static uniaxial compression tests on selective laser melted specimens of both Ti6Al4V BCC and filleted BCC (BCC-F) lattices with different relative densities. Thirdly, a yield stress constraint for optimising FGLSs was developed based on surrogate models quantifying the relationships between the relative density and the effective properties of BCC and BCC-F lattices developed using experimental results assisted by numerical homogenisation. This framework was tested with two case studies. Results showed that structural safety with respect to avoiding yield failure of the optimised FGLSs can be ensured and the introduction of fillets can effectively improve the strength-to-weight ratio of the optimised FGLSs composed of BCC type lattices. The BCC-F FGLS achieved 14.5% improvement in weight reduction compared with BCC FGLS for the Messerschmitt-Bölkow-Blohm beam optimisation case study.
Date Issued
2022-12-19
Date Acceptance
2022-12-16
Citation
Materials, 2022, 15 (24), pp.1-26
URI
URL
DOI
ISSN
1996-1944
Publisher
https://www.mdpi.com/1996-1944/15/24/9072
Start Page
1
End Page
26
Journal / Book Title
Materials
Volume
15
Issue
24
Copyright Statement
Copyright: © 2022 by the authors.
Licensee MDPI, Basel, Switzerland.
This article is an open access article
distributed under the terms and
conditions of the Creative Commons
Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
License URL
Identifier
https://www.mdpi.com/1996-1944/15/24/9072
Publication Status
Published
Date Publish Online
2022-12-19