AccScience Publishing / MSAM / Volume 3 / Issue 2 / DOI: 10.36922/msam.3380
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ORIGINAL RESEARCH ARTICLE

Compressive properties and fatigue performance of NiTi lattice structures optimized by TPMS

Yunlong Ren1 ,  Yang Li1,2 ,  Lei Yang1,2,3* ,  Yun Chen1,2* ,  Chunze Yan3 ,  Bing Liu4 ,  Xuan Cai4 ,  Mingkang Zhang5 ,  Yusheng Shi3
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1 Department of Mechanical Design and Manufacturing, School of Transportation and Logistics Engineering, Wuhan University of Technology, Wuhan, Hubei, China
2 Hubei Longzhong Laboratory, Xiangyang, Hubei, China
3 State Key Laboratory of Materials Processing and Die and Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, China
4 Wuhan Second Ship Design and Research Institute, Wuhan, Hubei, China
5 Additive Manufacturing Laboratory and Mechanics Experiment Center, School of Mechanical and Energy Engineering, Guangdong Ocean University, Yangjiang, Guangdong, China
MSAM 2024, 3(2), 3380 https://doi.org/10.36922/msam.3380
Submitted: 22 May 2024 | Accepted: 1 June 2024 | Published: 20 June 2024
© 2024 by the Author(s). This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution 4.0 International License ( https://creativecommons.org/licenses/by/4.0/ )
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Abstract

Nickel titanium (NiTi) lattice structures prepared by laser powder bed fusion (LPBF) have great application potential, due to their unique shape memory effect, superelasticity, and controlled geometry characteristics. In this study, the NiTi I-graph-wrapped package (I-WP) and NiTi body-centered cubic (BCC) lattice structure samples were prepared by the LPBF process. The uniaxial compression properties and cyclic compression properties of NiTi lattice structure samples prepared by LPBF process were studied. The results showed that the surfaces of NiTi lattice structures were very rough and adhered with many powder particles. The sample optimization design through the minimal surface could effectively improve the mechanical properties and deformation resistance and change the surface morphology of fracture surfaces in high cycle fatigue. The I-WP lattice structure had a higher Young’s modulus and yield strength. The fatigue strength improved from 1.88 MPa (BCC structure lattice) to 2.08 MPa (I-WP structure lattice). The simulation was performed to investigate the mechanism underlying the improvement in fatigue strength, revealing that optimization of surface stress distribution could be the plausible reason. In general, this study provides valuable guidance for the preparation and design of NiTi lattice structure by the LPBF process.

Keywords
Nickel titanium alloy
Additive manufacturing
Triply periodic minimal surface
Laser powder bed fusion
Lattice structure
Funding
This study was supported by the National Natural Science Foundation of China (No. 52105396, 52235008, and U2341270) and the Open Fund of Hubei Longzhong Laboratory (2022ZZ-28).
Conflict of interest
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Editorial Disclosure

Chunze Yan serves as the Editorial Board Member of the journal, but did not in any way involve in the editorial and peer-review process conducted for this paper, directly or indirectly.

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Materials Science in Additive Manufacturing, Electronic ISSN: 2810-9635 Published by AccScience Publishing
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