AccScience Publishing / IJB / Volume 9 / Issue 6 / DOI: 10.36922/ijb.1011
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RESEARCH ARTICLE

Lightweight load-bearing heat dissipation multifunctional pomelo peel-inspired structures fabricated by laser powder bed fusion

Linxuan Li1 Dongdong Gu1* He Liu1 Han Zhang1 Junhao Shan1 Yijuan Zhang1
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1 Jiangsu Provincial Engineering Laboratory for Laser Additive Manufacturing of High-Performance Metallic Components, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
Submitted: 29 May 2023 | Accepted: 31 July 2023 | Published: 30 August 2023
(This article belongs to the Special Issue 3D Bioprinting for Materials and Application)
© 2023 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/ )
Abstract

 

 The heat dissipation structure used in modern airborne radar chassis not only requires lightweight, but also pursues better mechanical properties and heat dissipation performance. In this study, a stochastically porous pomelo peel-inspired gradient structure was fabricated by laser powder bed fusion using Al-Mg-Sc-Zr powder. This study focused on the formability, microstructure, mechanical properties, and heat dissipation performance of the biomimetic structure through experimental and finite element analysis approaches. The influence of volume fraction (VF) on structural mechanical properties, deformation modes, stress distribution, and heat dissipation performance was investigated. The results showed that the mechanical properties of the structure declined as the VFs decreased. The optimal mechanical performance was obtained at the VF of 45%, where the compressive strength, specific energy absorption (Ws), and specific compressive strength values were measured to be 63.47 MPa, 34.84 J/g, and 142.16 MPa/(g·cm-3), respectively. Moreover, the Ws of the structures was higher than that of the reported aluminum alloy structures at the same VF. The biomimetic structure exhibited improved heat dissipation performance as the VFs decreased, with Reynolds number ranging from 2700 to 13,400. The structure of 30% VF with a remarkable heat transfer efficiency index of 1.86 displayed the best heat dissipation performance. In addition, compared with the traditional fin structures, the bionic structure possessed better thermal resistance, heat transfer efficiency index, and temperature uniformity at the same VF. This study demonstrated notable potential of pomelo peel-inspired design for lightweight load-bearing applications capable of heat-dissipating performance, providing a novel perspective for design and fabrication of versatile structures in the aviation field.

Keywords
Multifunctional biomimetic structure
Laser powder bed fusion
Mechanical properties
Heat dissipation performance
Funding
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Conflict of interest
The authors declare no conflicts of interests.
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International Journal of Bioprinting, Electronic ISSN: 2424-8002 Print ISSN: 2424-7723, Published by AccScience Publishing