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Compression–compression fatigue behaviour of gyroid-type triply periodic minimal surface porous structures fabricated by selective laser melting

Compression–compression fatigue behaviour of gyroid-type triply periodic minimal surface porous structures fabricated by selective laser melting
Compression–compression fatigue behaviour of gyroid-type triply periodic minimal surface porous structures fabricated by selective laser melting

Triply Periodic Minimal Surface (TPMS) porous structures are recognized as the most promising bionic artificial structures for tissue engineering. The fatigue properties of additive manufactured porous structures are essential for long-term use in a dynamical bio-skeletal environment. The aim of this study is to study the compression–compression fatigue behaviour and the underlying fatigue mechanism of Gyroid cellular structures (GCS), a typical TPMS porous structure. The high-cycle fatigue results show that both cyclic ratcheting and fatigue damage phenomena contribute to the failure of GCS during fatigue testing. For most fatigue loading stress, the failure samples have nearly 45° fracture bands along the diagonal surface. The fatigue ratio of GCS reaches 0.35 for as-built samples and can be raised to 0.45 after sandblasting treatment. The fatigue ratio values are higher than most of the other bending-dominated lattice structures, suggesting superior fatigue resistance properties of GCSs due to the smooth surface connection between struts. Besides, a systematic investigation of the crack initiation and propagation was conducted by both deformation analysis and finite element method to support experimental phenomena. The results also indicate that the fatigue resistance properties of GCSs are significantly enhanced by sandblasting post-treatment, through removing the adhered powder particles, inducing compressive residual stress on the surface and generating a nanocrystalline zone.

Additive manufacturing, Fatigue properties, Porous structure, Selective laser melting, Stainless steel, Triply periodic minimal surface
1359-6454
49-66
Yang, Lei
3374a6c7-e285-4014-a301-ad6cea7251af
Yan, Chunze
429c7099-992f-46df-b714-b50ae2980d98
Cao, Wenchao
22e1d74d-d4ec-4389-8223-d24d36047ea1
Liu, Zhufeng
ebc25b87-c3ef-477b-a4a4-8fbfc6bab6d4
Song, Bo
725af998-fbad-4387-8c58-cc25b2af4fb3
Wen, Shifeng
36deff92-8b62-476f-8265-faf2dcf501f6
Zhang, Cong
c133e98d-4a93-4273-931a-b3f6c908bb7a
Shi, Yusheng
c5e10cdc-0c6e-4de9-877d-9b83955e0955
Yang, Shoufeng
e0018adf-8123-4a54-b8dd-306c10ca48f1
Yang, Lei
3374a6c7-e285-4014-a301-ad6cea7251af
Yan, Chunze
429c7099-992f-46df-b714-b50ae2980d98
Cao, Wenchao
22e1d74d-d4ec-4389-8223-d24d36047ea1
Liu, Zhufeng
ebc25b87-c3ef-477b-a4a4-8fbfc6bab6d4
Song, Bo
725af998-fbad-4387-8c58-cc25b2af4fb3
Wen, Shifeng
36deff92-8b62-476f-8265-faf2dcf501f6
Zhang, Cong
c133e98d-4a93-4273-931a-b3f6c908bb7a
Shi, Yusheng
c5e10cdc-0c6e-4de9-877d-9b83955e0955
Yang, Shoufeng
e0018adf-8123-4a54-b8dd-306c10ca48f1

Yang, Lei, Yan, Chunze, Cao, Wenchao, Liu, Zhufeng, Song, Bo, Wen, Shifeng, Zhang, Cong, Shi, Yusheng and Yang, Shoufeng (2019) Compression–compression fatigue behaviour of gyroid-type triply periodic minimal surface porous structures fabricated by selective laser melting. Acta Materialia, 181, 49-66. (doi:10.1016/j.actamat.2019.09.042).

Record type: Article

Abstract

Triply Periodic Minimal Surface (TPMS) porous structures are recognized as the most promising bionic artificial structures for tissue engineering. The fatigue properties of additive manufactured porous structures are essential for long-term use in a dynamical bio-skeletal environment. The aim of this study is to study the compression–compression fatigue behaviour and the underlying fatigue mechanism of Gyroid cellular structures (GCS), a typical TPMS porous structure. The high-cycle fatigue results show that both cyclic ratcheting and fatigue damage phenomena contribute to the failure of GCS during fatigue testing. For most fatigue loading stress, the failure samples have nearly 45° fracture bands along the diagonal surface. The fatigue ratio of GCS reaches 0.35 for as-built samples and can be raised to 0.45 after sandblasting treatment. The fatigue ratio values are higher than most of the other bending-dominated lattice structures, suggesting superior fatigue resistance properties of GCSs due to the smooth surface connection between struts. Besides, a systematic investigation of the crack initiation and propagation was conducted by both deformation analysis and finite element method to support experimental phenomena. The results also indicate that the fatigue resistance properties of GCSs are significantly enhanced by sandblasting post-treatment, through removing the adhered powder particles, inducing compressive residual stress on the surface and generating a nanocrystalline zone.

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Manuscript-0814 revised - Accepted Manuscript
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More information

Accepted/In Press date: 21 September 2019
e-pub ahead of print date: 24 September 2019
Published date: 1 December 2019
Keywords: Additive manufacturing, Fatigue properties, Porous structure, Selective laser melting, Stainless steel, Triply periodic minimal surface

Identifiers

Local EPrints ID: 435700
URI: http://eprints.soton.ac.uk/id/eprint/435700
ISSN: 1359-6454
PURE UUID: 1925a90d-c496-498e-93b3-cbf0220ec594
ORCID for Shoufeng Yang: ORCID iD orcid.org/0000-0002-3888-3211

Catalogue record

Date deposited: 18 Nov 2019 17:30
Last modified: 10 Jan 2022 05:14

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Contributors

Author: Lei Yang
Author: Chunze Yan
Author: Wenchao Cao
Author: Zhufeng Liu
Author: Bo Song
Author: Shifeng Wen
Author: Cong Zhang
Author: Yusheng Shi
Author: Shoufeng Yang ORCID iD

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