Influence of relative density on quasi-static and fatigue failure of lattice structures in Ti6Al4V produced by laser powder bed fusion

Abstract Lattice structures produced by additive manufacturing have been increasingly studied in recent years due to their potential to tailor prescribed mechanical properties. Their mechanical performances are influenced by several factors such as unit cell topology, parent material and relative de...

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Autores principales:	Markel Alaña, Antonio Cutolo, Sergio Ruiz de Galarreta, Brecht Van Hooreweder
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/3b78bef4bccd403bbca139974eec4ac4
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spelling	oai:doaj.org-article:3b78bef4bccd403bbca139974eec4ac42021-12-02T17:37:12ZInfluence of relative density on quasi-static and fatigue failure of lattice structures in Ti6Al4V produced by laser powder bed fusion10.1038/s41598-021-98631-32045-2322https://doaj.org/article/3b78bef4bccd403bbca139974eec4ac42021-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-98631-3https://doaj.org/toc/2045-2322Abstract Lattice structures produced by additive manufacturing have been increasingly studied in recent years due to their potential to tailor prescribed mechanical properties. Their mechanical performances are influenced by several factors such as unit cell topology, parent material and relative density. In this study, static and dynamic behaviors of Ti6Al4V lattice structures were analyzed focusing on the criteria used to define the failure of lattices. A modified face-centered cubic (FCCm) lattice structure was designed to avoid the manufacturing problems that arise in the production of horizontal struts by laser powder bed fusion. The Gibson–Ashby curves of the FCCm lattice were obtained and it was found that relative density not only affects stiffness and strength of the structures, but also has important implications on the assumption of macroscopic yield criterion. Regarding fatigue properties, a stiffness based criterion was analyzed to improve the assessment of lattice structure failure in load bearing applications, and the influence of relative density on the stiffness evolution was studied. Apart from common normalization of S–N curves, a more accurate fatigue failure surface was developed, which is also compatible with stiffness based failure criteria. Finally, the effect of hot isostatic pressing in FCCm structures was also studied.Markel AlañaAntonio CutoloSergio Ruiz de GalarretaBrecht Van HoorewederNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-15 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Markel Alaña Antonio Cutolo Sergio Ruiz de Galarreta Brecht Van Hooreweder Influence of relative density on quasi-static and fatigue failure of lattice structures in Ti6Al4V produced by laser powder bed fusion
description	Abstract Lattice structures produced by additive manufacturing have been increasingly studied in recent years due to their potential to tailor prescribed mechanical properties. Their mechanical performances are influenced by several factors such as unit cell topology, parent material and relative density. In this study, static and dynamic behaviors of Ti6Al4V lattice structures were analyzed focusing on the criteria used to define the failure of lattices. A modified face-centered cubic (FCCm) lattice structure was designed to avoid the manufacturing problems that arise in the production of horizontal struts by laser powder bed fusion. The Gibson–Ashby curves of the FCCm lattice were obtained and it was found that relative density not only affects stiffness and strength of the structures, but also has important implications on the assumption of macroscopic yield criterion. Regarding fatigue properties, a stiffness based criterion was analyzed to improve the assessment of lattice structure failure in load bearing applications, and the influence of relative density on the stiffness evolution was studied. Apart from common normalization of S–N curves, a more accurate fatigue failure surface was developed, which is also compatible with stiffness based failure criteria. Finally, the effect of hot isostatic pressing in FCCm structures was also studied.
format	article
author	Markel Alaña Antonio Cutolo Sergio Ruiz de Galarreta Brecht Van Hooreweder
author_facet	Markel Alaña Antonio Cutolo Sergio Ruiz de Galarreta Brecht Van Hooreweder
author_sort	Markel Alaña
title	Influence of relative density on quasi-static and fatigue failure of lattice structures in Ti6Al4V produced by laser powder bed fusion
title_short	Influence of relative density on quasi-static and fatigue failure of lattice structures in Ti6Al4V produced by laser powder bed fusion
title_full	Influence of relative density on quasi-static and fatigue failure of lattice structures in Ti6Al4V produced by laser powder bed fusion
title_fullStr	Influence of relative density on quasi-static and fatigue failure of lattice structures in Ti6Al4V produced by laser powder bed fusion
title_full_unstemmed	Influence of relative density on quasi-static and fatigue failure of lattice structures in Ti6Al4V produced by laser powder bed fusion
title_sort	influence of relative density on quasi-static and fatigue failure of lattice structures in ti6al4v produced by laser powder bed fusion
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/3b78bef4bccd403bbca139974eec4ac4
work_keys_str_mv	AT markelalana influenceofrelativedensityonquasistaticandfatiguefailureoflatticestructuresinti6al4vproducedbylaserpowderbedfusion AT antoniocutolo influenceofrelativedensityonquasistaticandfatiguefailureoflatticestructuresinti6al4vproducedbylaserpowderbedfusion AT sergioruizdegalarreta influenceofrelativedensityonquasistaticandfatiguefailureoflatticestructuresinti6al4vproducedbylaserpowderbedfusion AT brechtvanhooreweder influenceofrelativedensityonquasistaticandfatiguefailureoflatticestructuresinti6al4vproducedbylaserpowderbedfusion
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Influence of relative density on quasi-static and fatigue failure of lattice structures in Ti6Al4V produced by laser powder bed fusion

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