Mechanical Performance of a Node-Reinforced Body-Centered Cubic Lattice Structure: An Equal-Strength Concept Design

IF 2.1 3区工程技术 Q2 ENGINEERING, AEROSPACE

Aerospace Pub Date : 2023-12-19 DOI:10.3390/aerospace11010004

Zeliang Liu, Rui Zhao, Chenglin Tao, Yuan Wang, Xi Liang

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Abstract

Lattice structures are characterized by a light weight, high strength, and high stiffness, and have a wide range of applications in the aerospace field. Node stress concentration is a key factor affecting the mechanical performance of lattice structures. In this paper, a new equal-strength body-centered cubic (ES-BCC) lattice structure was additively manufactured using 316L stainless steel via selective laser melting (SLM). The results of a mechanical compression test and finite element analysis revealed that the failure location of the ES-BCC structure changed from the nodes to the center of the struts. At the same density, the energy absorption, elastic modulus, and yield strength of the ES-BCC structure increased by 11.89%, 61.80%, and 53.72% compared to the BCC structure, respectively. Furthermore, the change in angle of the ES-BCC structure achieves significant changes in strength, stiffness, and energy absorption to meet different design requirements and engineering applications. The equal-strength concept design can be applied as a general design method to the design of other lightweight energy-absorbing lattice structures.

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节点加固体心立方晶格结构的力学性能：等强度概念设计

晶格结构具有重量轻、强度高和刚度大的特点，在航空航天领域有着广泛的应用。节点应力集中是影响晶格结构力学性能的关键因素。本文采用选择性激光熔融（SLM）技术，使用 316L 不锈钢添加制造了一种新型等强度体心立方（ES-BCC）晶格结构。机械压缩试验和有限元分析的结果表明，ES-BCC 结构的失效位置由支柱的节点变为中心。在相同密度下，与 BCC 结构相比，ES-BCC 结构的能量吸收、弹性模量和屈服强度分别提高了 11.89%、61.80% 和 53.72%。此外，ES-BCC 结构的角度变化可实现强度、刚度和能量吸收的显著变化，以满足不同的设计要求和工程应用。等强度概念设计可作为一种通用设计方法，应用于其他轻质吸能晶格结构的设计。

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来源期刊

Aerospace ENGINEERING, AEROSPACE-

CiteScore

3.40

自引率

23.10%

发文量

661

审稿时长

6 weeks

期刊介绍： Aerospace is a multidisciplinary science inviting submissions on, but not limited to, the following subject areas: aerodynamics computational fluid dynamics fluid-structure interaction flight mechanics plasmas research instrumentation test facilities environment material science structural analysis thermophysics and heat transfer thermal-structure interaction aeroacoustics optics electromagnetism and radar propulsion power generation and conversion fuels and propellants combustion multidisciplinary design optimization software engineering data analysis signal and image processing artificial intelligence aerospace vehicles'' operation, control and maintenance risk and reliability human factors human-automation interaction airline operations and management air traffic management airport design meteorology space exploration multi-physics interaction.