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Evaluating Lattice Mechanical Properties for Lightweight Heat-Resistant Load-Bearing Structure Design

Heat-resistant, load-bearing components are common in aircraft, and they have high requirements for lightweight and mechanical performance. Lattice topology optimization can achieve high mechanical properties and obtain lightweight designs. Appropriate lattice selection is crucial when employing the...

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Autores principales: Wang, Xinglong, Wang, Cheng, Zhou, Xin, Wang, Di, Zhang, Mingkang, Gao, Yun, Wang, Lei, Zhang, Peiyu
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7662806/
https://www.ncbi.nlm.nih.gov/pubmed/33120911
http://dx.doi.org/10.3390/ma13214786
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author Wang, Xinglong
Wang, Cheng
Zhou, Xin
Wang, Di
Zhang, Mingkang
Gao, Yun
Wang, Lei
Zhang, Peiyu
author_facet Wang, Xinglong
Wang, Cheng
Zhou, Xin
Wang, Di
Zhang, Mingkang
Gao, Yun
Wang, Lei
Zhang, Peiyu
author_sort Wang, Xinglong
collection PubMed
description Heat-resistant, load-bearing components are common in aircraft, and they have high requirements for lightweight and mechanical performance. Lattice topology optimization can achieve high mechanical properties and obtain lightweight designs. Appropriate lattice selection is crucial when employing the lattice topology optimization method. The mechanical properties of a structure can be optimized by choosing lattice structures suitable for the specific stress environment being endured by the structural components. Metal lattice structures exhibit excellent unidirectional load-bearing performance and the triply periodic minimal surface (TPMS) porous structure can satisfy multi-scale free designs. Both lattice types can provide unique advantages; therefore, we designed three types of metal lattices (body-centered cubic (BCC), BCC with Z-struts (BCCZ), and honeycomb) and three types of TPMS lattices (gyroid, primitive, and I-Wrapped Package (I-WP)) combined with the solid shell. Each was designed with high level of relative density (40%, 50%, 60%, 70%, and 80%), which can be directly used in engineering practice. All test specimens were manufactured by selective laser melting (SLM) technology using Inconel 718 superalloy as the material and underwent static tensile testing. We found that the honeycomb test specimen exhibits the best strength, toughness, and stiffness properties among all structures evaluated, which is especially suitable for the lattice topology optimization design of heat-resistant, unidirectional load-bearing structures within aircraft. Furthermore, we also found an interesting phenomenon that the toughness of the primitive and honeycomb porous test specimens exhibited sudden increases from 70% to 80% and from 50% to 60% relative density, respectively, due to their structural characteristics. According to the range of the exponent value n and the deformation laws of porous structures, we also concluded that a porous structure would exhibit a stretching-dominated deformation behavior when exponent value n < 0.3, a bending-dominated deformation behavior when n > 0.55, and a stretching-bending-dominated deformation behavior when 0.3 < n < 0.55. This study can provide a design basis for selecting an appropriate lattice in lattice topology optimization design.
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spelling pubmed-76628062020-11-14 Evaluating Lattice Mechanical Properties for Lightweight Heat-Resistant Load-Bearing Structure Design Wang, Xinglong Wang, Cheng Zhou, Xin Wang, Di Zhang, Mingkang Gao, Yun Wang, Lei Zhang, Peiyu Materials (Basel) Article Heat-resistant, load-bearing components are common in aircraft, and they have high requirements for lightweight and mechanical performance. Lattice topology optimization can achieve high mechanical properties and obtain lightweight designs. Appropriate lattice selection is crucial when employing the lattice topology optimization method. The mechanical properties of a structure can be optimized by choosing lattice structures suitable for the specific stress environment being endured by the structural components. Metal lattice structures exhibit excellent unidirectional load-bearing performance and the triply periodic minimal surface (TPMS) porous structure can satisfy multi-scale free designs. Both lattice types can provide unique advantages; therefore, we designed three types of metal lattices (body-centered cubic (BCC), BCC with Z-struts (BCCZ), and honeycomb) and three types of TPMS lattices (gyroid, primitive, and I-Wrapped Package (I-WP)) combined with the solid shell. Each was designed with high level of relative density (40%, 50%, 60%, 70%, and 80%), which can be directly used in engineering practice. All test specimens were manufactured by selective laser melting (SLM) technology using Inconel 718 superalloy as the material and underwent static tensile testing. We found that the honeycomb test specimen exhibits the best strength, toughness, and stiffness properties among all structures evaluated, which is especially suitable for the lattice topology optimization design of heat-resistant, unidirectional load-bearing structures within aircraft. Furthermore, we also found an interesting phenomenon that the toughness of the primitive and honeycomb porous test specimens exhibited sudden increases from 70% to 80% and from 50% to 60% relative density, respectively, due to their structural characteristics. According to the range of the exponent value n and the deformation laws of porous structures, we also concluded that a porous structure would exhibit a stretching-dominated deformation behavior when exponent value n < 0.3, a bending-dominated deformation behavior when n > 0.55, and a stretching-bending-dominated deformation behavior when 0.3 < n < 0.55. This study can provide a design basis for selecting an appropriate lattice in lattice topology optimization design. MDPI 2020-10-27 /pmc/articles/PMC7662806/ /pubmed/33120911 http://dx.doi.org/10.3390/ma13214786 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Wang, Xinglong
Wang, Cheng
Zhou, Xin
Wang, Di
Zhang, Mingkang
Gao, Yun
Wang, Lei
Zhang, Peiyu
Evaluating Lattice Mechanical Properties for Lightweight Heat-Resistant Load-Bearing Structure Design
title Evaluating Lattice Mechanical Properties for Lightweight Heat-Resistant Load-Bearing Structure Design
title_full Evaluating Lattice Mechanical Properties for Lightweight Heat-Resistant Load-Bearing Structure Design
title_fullStr Evaluating Lattice Mechanical Properties for Lightweight Heat-Resistant Load-Bearing Structure Design
title_full_unstemmed Evaluating Lattice Mechanical Properties for Lightweight Heat-Resistant Load-Bearing Structure Design
title_short Evaluating Lattice Mechanical Properties for Lightweight Heat-Resistant Load-Bearing Structure Design
title_sort evaluating lattice mechanical properties for lightweight heat-resistant load-bearing structure design
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7662806/
https://www.ncbi.nlm.nih.gov/pubmed/33120911
http://dx.doi.org/10.3390/ma13214786
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