Buckling optimization of Kagome lattice cores with free-form trusses

被引：48
作者：
Zhang, Lei [1 ]
Feih, Stefanie [2 ]
Daynes, Stephen [2 ]
Wang, Yiqiang [3 ]
Wang, Michael Yu [3 ,4 ]
Wei, Jun [2 ]
Lu, Wen Feng [1 ]
机构：
[1] Natl Univ Singapore, Dept Mech Engn, 9 Engn Dr 1, Singapore 117575, Singapore
[2] Singapore Inst Mfg Technol SIMTech, Joining Technol Grp, 2 FusionopolisWay, Singapore 138634, Singapore
[3] Hong Kong Univ Sci & Technol, Dept Mech & Aerosp Engn, Kowloon, Hong Kong, Peoples R China
[4] Hong Kong Univ Sci & Technol, Dept Elect & Comp Engn, Kowloon, Hong Kong, Peoples R China
来源：
MATERIALS & DESIGN | 2018年 / 145卷
关键词：
Additive manufacturing; Shape design; Buckling failure; Kagome lattice core; Free-form truss; TOPOLOGY OPTIMIZATION; MECHANICAL-PROPERTIES; IMPERFECTIONS; COMPRESSION; BEHAVIOR; COLUMNS;
D O I：
10.1016/j.matdes.2018.02.026
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Lightweight lattice structures are an important class of cellular structures with high potentials for multifunctional applications. Considering load-bearing requirements, truss buckling is one of the main failure mechanisms for low density and slender lattice structures. Critical buckling loads can be increased by modifying the profile of a truss. In this paper, we present a shape design method to optimize the critical buckling loads for lattice cores with free-form trusses. The free-form truss is represented by Fourier series and implicit surfaces, having smooth truss diameter variations and truss joints. The optimized truss profile is obtained by solving a parametric shape optimization problem with Fourier series coefficients as design variables. The method is used for designing optimized 1D columns and 3D Kagome lattice cores for sandwich panels. The numerical results predict 26.8% and 20.4% improvements of the critical buckling loads for 1D columns and 3D Kagome lattice cores compared to their uniform counterparts of the same mass, respectively. The optimized structures include complex smooth and curved geometries that are well suited for additive manufacturing because of the greater design freedom. Finally, the initial and optimized lattice cores are additively manufactured and tested. The experimental results validate the effectiveness of the proposed method. (C) 2018 Elsevier Ltd. All rights reserved.
引用
收藏
页码：144 / 155
页数：12
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