Topology optimisation for design and additive manufacturing of functionally graded lattice structures using derivative-aware machine learning algorithms

被引:11
|
作者
Wu, Chi [1 ]
Luo, Junjie [2 ]
Zhong, Jingxiao [1 ]
Xu, Yanan [1 ]
Wan, Boyang [1 ]
Huang, Wenwei [1 ]
Fang, Jianguang [3 ]
Steven, Grant P. [1 ]
Sun, Guangyong [2 ]
Li, Qing [1 ]
机构
[1] Univ Sydney, Sch Aerosp Mech & Mechatron Engn, Sydney, NSW 2006, Australia
[2] Hunan Univ, State Key Lab Adv Design & Manufacture Vehicle Bod, Changsha 410082, Peoples R China
[3] Univ Technol Sydney, Sch Civil & Environm Engn, Sydney, NSW 2007, Australia
基金
澳大利亚研究理事会;
关键词
Topology optimisation; Derivative -aware machine learning; Functionally graded lattice structure; Additive manufacturing; Tissue scaffold; LEVEL-SET METHOD; PROJECTION METHOD; SCAFFOLD; MICROSTRUCTURE;
D O I
10.1016/j.addma.2023.103833
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Although additive manufacturing has offered substantially new opportunities and flexibility for fabricating 3D complex lattice structures, effective design of such sophisticated structures with desired multifunctional characteristics remains a demanding task. To tackle this challenge, we develop an inventive multiscale topology optimisation approach for additively manufactured lattices by leveraging a derivative-aware machine learning algorithm. Our objective is to optimise non-uniform unit cells for achieving an as uniform strain pattern as possible. The proposed approach exhibits great potential for biomedical applications, such as implantable devices mitigating strain and stress shielding. To validate the effectiveness of our framework, we present two illustrative examples through the dedicated digital image correlation (DIC) tests on the optimised samples fabricated using a powder bed fusion (PBF) technique. Furthermore, we demonstrate a practical application of our approach through developing bone tissue scaffolds composed of optimised non-uniform iso-truss lattices for two typical musculoskeletal reconstruction cases. These optimised lattice-based scaffolds present a more uniform strain field in complex anatomical and physiological condition, thereby creating a favourable biomechanical environment for maximising bone formation effectively. The proposed approach is anticipated to make a significant step forward in design for additively manufactured multiscale lattice structures with desirable mechanical characteristics for a broad range of applications.
引用
收藏
页数:17
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