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Mechanical response of a triply periodic minimal surface cellular structures manufactured by selective laser melting

Mechanical response of a triply periodic minimal surface cellular structures manufactured by selective laser melting
Mechanical response of a triply periodic minimal surface cellular structures manufactured by selective laser melting
Cellular structures with controllable mechanical properties and porous architecture are the most promising candidates for many applications such as bone implants. Selective laser melting (SLM), one of the additive manufacturing (AM) technologies, enables manufacturing of space filling lattice structures with exceptional load bearing efficiency, customizable stiffness, controllable cell topology, cell size, and porosity. In this work, Schoen Gyroid (SG) unit cell, a triply periodic minimal surface (TPMS) structure, was used to design the cellular structures. As opposed to many other types of unit cells, SG has superior characteristics of self-supporting and high manufacturability for AM technologies. The titanium alloy (Ti–6Al–4V) SG cellular structures were manufactured by SLM. Finite element (FE) method was employed to predict the elastic modulus, compressive yield strength and stress/strain distributions of the SG cellular structures, and the failure occurrence mechanisms were analyzed. The FE results were compared with the experimental data. The results show that through FE method, the mechanical responses of the SG cellular structures can be accurately described and it is possible to customize the mechanical properties of SLM-produced titanium alloy TPMS lattices.
Cellular structure, Additive manufacturing, Selective laser melting, Finite element method, Mechanical behaviors
0020-7403
149-157
Yang, Lei
3374a6c7-e285-4014-a301-ad6cea7251af
Yan, Chunze
429c7099-992f-46df-b714-b50ae2980d98
Han, Changjun
b9f62b89-5f3c-4ec1-9307-5cf7650e69d8
Chen, Peng
7f828b90-4c97-4e26-9124-f46daa176a4b
Yang, Shoufeng
e0018adf-8123-4a54-b8dd-306c10ca48f1
Shi, Yusheng
c5e10cdc-0c6e-4de9-877d-9b83955e0955
Yang, Lei
3374a6c7-e285-4014-a301-ad6cea7251af
Yan, Chunze
429c7099-992f-46df-b714-b50ae2980d98
Han, Changjun
b9f62b89-5f3c-4ec1-9307-5cf7650e69d8
Chen, Peng
7f828b90-4c97-4e26-9124-f46daa176a4b
Yang, Shoufeng
e0018adf-8123-4a54-b8dd-306c10ca48f1
Shi, Yusheng
c5e10cdc-0c6e-4de9-877d-9b83955e0955

Yang, Lei, Yan, Chunze, Han, Changjun, Chen, Peng, Yang, Shoufeng and Shi, Yusheng (2018) Mechanical response of a triply periodic minimal surface cellular structures manufactured by selective laser melting. International Journal of Mechanical Sciences, 148, 149-157. (doi:10.1016/j.ijmecsci.2018.08.039).

Record type: Article

Abstract

Cellular structures with controllable mechanical properties and porous architecture are the most promising candidates for many applications such as bone implants. Selective laser melting (SLM), one of the additive manufacturing (AM) technologies, enables manufacturing of space filling lattice structures with exceptional load bearing efficiency, customizable stiffness, controllable cell topology, cell size, and porosity. In this work, Schoen Gyroid (SG) unit cell, a triply periodic minimal surface (TPMS) structure, was used to design the cellular structures. As opposed to many other types of unit cells, SG has superior characteristics of self-supporting and high manufacturability for AM technologies. The titanium alloy (Ti–6Al–4V) SG cellular structures were manufactured by SLM. Finite element (FE) method was employed to predict the elastic modulus, compressive yield strength and stress/strain distributions of the SG cellular structures, and the failure occurrence mechanisms were analyzed. The FE results were compared with the experimental data. The results show that through FE method, the mechanical responses of the SG cellular structures can be accurately described and it is possible to customize the mechanical properties of SLM-produced titanium alloy TPMS lattices.

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More information

Accepted/In Press date: 30 August 2018
e-pub ahead of print date: 31 August 2018
Published date: 1 November 2018
Keywords: Cellular structure, Additive manufacturing, Selective laser melting, Finite element method, Mechanical behaviors

Identifiers

Local EPrints ID: 435633
URI: http://eprints.soton.ac.uk/id/eprint/435633
ISSN: 0020-7403
PURE UUID: 967bf767-b87e-403e-a24c-e9aab2fde87f
ORCID for Shoufeng Yang: ORCID iD orcid.org/0000-0002-3888-3211

Catalogue record

Date deposited: 15 Nov 2019 17:30
Last modified: 17 Dec 2019 01:41

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Contributors

Author: Lei Yang
Author: Chunze Yan
Author: Changjun Han
Author: Peng Chen
Author: Shoufeng Yang ORCID iD
Author: Yusheng Shi

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