Cargando…

LPBF Manufactured Functionally Graded Lattice Structures Obtained by Graded Density and Hybrid Poisson’s Ratio

The additive manufacturing (AM) of innovative lattice structures with unique mechanical properties has received widespread attention due to the capability of AM processes to fabricate freeform and intricate structures. The most common way to characterize the additively manufactured lattice structure...

Descripción completa

Detalles Bibliográficos
Autores principales: Abdelaal, Osama, Hengsbach, Florian, Schaper, Mirko, Hoyer, Kay-Peter
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9230827/
https://www.ncbi.nlm.nih.gov/pubmed/35744133
http://dx.doi.org/10.3390/ma15124072
_version_ 1784735165096919040
author Abdelaal, Osama
Hengsbach, Florian
Schaper, Mirko
Hoyer, Kay-Peter
author_facet Abdelaal, Osama
Hengsbach, Florian
Schaper, Mirko
Hoyer, Kay-Peter
author_sort Abdelaal, Osama
collection PubMed
description The additive manufacturing (AM) of innovative lattice structures with unique mechanical properties has received widespread attention due to the capability of AM processes to fabricate freeform and intricate structures. The most common way to characterize the additively manufactured lattice structures is via the uniaxial compression test. However, although there are many applications for which lattice structures are designed for bending (e.g., sandwich panels cores and some medical implants), limited attention has been paid toward investigating the flexural behavior of metallic AM lattice structures with tunable internal architectures. The purpose of this study was to experimentally investigate the flexural behavior of AM Ti-6Al-4V lattice structures with graded density and hybrid Poisson’s ratio (PR). Four configurations of lattice structure beams with positive, negative, hybrid PR, and a novel hybrid PR with graded density were manufactured via the laser powder bed fusion (LPBF) AM process and tested under four-point bending. The manufacturability, microstructure, micro-hardness, and flexural properties of the lattices were evaluated. During the bending tests, different failure mechanisms were observed, which were highly dependent on the type of lattice geometry. The best response in terms of absorbed energy was obtained for the functionally graded hybrid PR (FGHPR) structure. Both the FGHPR and hybrid PR (HPR) structured showed a 78.7% and 62.9% increase in the absorbed energy, respectively, compared to the positive PR (PPR) structure. This highlights the great potential for FGHPR lattices to be used in protective devices, load-bearing medical implants, and energy-absorbing applications.
format Online
Article
Text
id pubmed-9230827
institution National Center for Biotechnology Information
language English
publishDate 2022
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-92308272022-06-25 LPBF Manufactured Functionally Graded Lattice Structures Obtained by Graded Density and Hybrid Poisson’s Ratio Abdelaal, Osama Hengsbach, Florian Schaper, Mirko Hoyer, Kay-Peter Materials (Basel) Article The additive manufacturing (AM) of innovative lattice structures with unique mechanical properties has received widespread attention due to the capability of AM processes to fabricate freeform and intricate structures. The most common way to characterize the additively manufactured lattice structures is via the uniaxial compression test. However, although there are many applications for which lattice structures are designed for bending (e.g., sandwich panels cores and some medical implants), limited attention has been paid toward investigating the flexural behavior of metallic AM lattice structures with tunable internal architectures. The purpose of this study was to experimentally investigate the flexural behavior of AM Ti-6Al-4V lattice structures with graded density and hybrid Poisson’s ratio (PR). Four configurations of lattice structure beams with positive, negative, hybrid PR, and a novel hybrid PR with graded density were manufactured via the laser powder bed fusion (LPBF) AM process and tested under four-point bending. The manufacturability, microstructure, micro-hardness, and flexural properties of the lattices were evaluated. During the bending tests, different failure mechanisms were observed, which were highly dependent on the type of lattice geometry. The best response in terms of absorbed energy was obtained for the functionally graded hybrid PR (FGHPR) structure. Both the FGHPR and hybrid PR (HPR) structured showed a 78.7% and 62.9% increase in the absorbed energy, respectively, compared to the positive PR (PPR) structure. This highlights the great potential for FGHPR lattices to be used in protective devices, load-bearing medical implants, and energy-absorbing applications. MDPI 2022-06-08 /pmc/articles/PMC9230827/ /pubmed/35744133 http://dx.doi.org/10.3390/ma15124072 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/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/).
spellingShingle Article
Abdelaal, Osama
Hengsbach, Florian
Schaper, Mirko
Hoyer, Kay-Peter
LPBF Manufactured Functionally Graded Lattice Structures Obtained by Graded Density and Hybrid Poisson’s Ratio
title LPBF Manufactured Functionally Graded Lattice Structures Obtained by Graded Density and Hybrid Poisson’s Ratio
title_full LPBF Manufactured Functionally Graded Lattice Structures Obtained by Graded Density and Hybrid Poisson’s Ratio
title_fullStr LPBF Manufactured Functionally Graded Lattice Structures Obtained by Graded Density and Hybrid Poisson’s Ratio
title_full_unstemmed LPBF Manufactured Functionally Graded Lattice Structures Obtained by Graded Density and Hybrid Poisson’s Ratio
title_short LPBF Manufactured Functionally Graded Lattice Structures Obtained by Graded Density and Hybrid Poisson’s Ratio
title_sort lpbf manufactured functionally graded lattice structures obtained by graded density and hybrid poisson’s ratio
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9230827/
https://www.ncbi.nlm.nih.gov/pubmed/35744133
http://dx.doi.org/10.3390/ma15124072
work_keys_str_mv AT abdelaalosama lpbfmanufacturedfunctionallygradedlatticestructuresobtainedbygradeddensityandhybridpoissonsratio
AT hengsbachflorian lpbfmanufacturedfunctionallygradedlatticestructuresobtainedbygradeddensityandhybridpoissonsratio
AT schapermirko lpbfmanufacturedfunctionallygradedlatticestructuresobtainedbygradeddensityandhybridpoissonsratio
AT hoyerkaypeter lpbfmanufacturedfunctionallygradedlatticestructuresobtainedbygradeddensityandhybridpoissonsratio