Ifeanyichukwu Echeta
Finite element modelling of defects in additively manufactured strut-based lattice structures
Echeta, Ifeanyichukwu; Dutton, Ben; Leach, Richard K.; Piano, Samanta
Authors
Ben Dutton
RICHARD LEACH RICHARD.LEACH@NOTTINGHAM.AC.UK
Chair in Metrology
Dr SAMANTA PIANO SAMANTA.PIANO@NOTTINGHAM.AC.UK
Professor of Metrology
Abstract
Strut-based lattice structures produced by powder bed fusion are prone to characteristic manufacturing defects that alter both their form and surface texture. Most studies in the literature focus on a subset of commonly observed defects, typically radius variation and strut waviness; surface defects remain relatively unexplored. Furthermore, there remains a need for the development of a general finite element modelling framework that can implement a range of defects into any strut-based lattice design. This paper presents a modelling framework for implementing a range of both form and surface defects into finite element meshes of strut-based lattices. A signed distance function forms the foundation for this framework, upon which surface meshes can be modified and converted into tetrahedral meshes via open-source software. The paper demonstrates how radius variation, strut waviness, elliptical cross sections and surface defects can be modelled in lattice struts, for which intuitive mathematical definitions are provided. A parametric study is performed to assess the sensitivity of the compressive Young's modulus of BCCZ and octet-truss lattices to upskin and downskin surface defects. The results showed higher sensitivity in the octet-truss than in the BCCZ; both designs were more sensitive to downskin defects than upskin defects.
Citation
Echeta, I., Dutton, B., Leach, R. K., & Piano, S. (2021). Finite element modelling of defects in additively manufactured strut-based lattice structures. Additive Manufacturing, 47, Article 102301. https://doi.org/10.1016/j.addma.2021.102301
Journal Article Type | Article |
---|---|
Acceptance Date | Sep 7, 2021 |
Online Publication Date | Sep 20, 2021 |
Publication Date | Nov 1, 2021 |
Deposit Date | Sep 16, 2021 |
Publicly Available Date | Sep 21, 2022 |
Journal | Additive Manufacturing |
Print ISSN | 2214-8604 |
Electronic ISSN | 2214-8604 |
Publisher | Elsevier BV |
Peer Reviewed | Peer Reviewed |
Volume | 47 |
Article Number | 102301 |
DOI | https://doi.org/10.1016/j.addma.2021.102301 |
Keywords | Industrial and Manufacturing Engineering; Engineering (miscellaneous); General Materials Science; Biomedical Engineering |
Public URL | https://nottingham-repository.worktribe.com/output/6242974 |
Publisher URL | https://www.sciencedirect.com/science/article/pii/S2214860421004607 |
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