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| Topology optimization of double-skin stiffened sandwich structure for additive manufacturing |
| Received:April 25, 2022 Revised:September 28, 2022 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20220425001 |
| KeyWord:thin-walled structures hierarchical structure topology optimization stiffener design additive Manufacturing |
| Author | Institution |
| 霍泽凯 |
大连理工大学 工业装备结构分析国家重点实验室, 大连 ;北京机电工程研究所, 北京 |
| 王博 |
大连理工大学 工业装备结构分析国家重点实验室, 大连 |
| 周演 |
大连理工大学 工业装备结构分析国家重点实验室, 大连 |
| 郝鹏 |
大连理工大学 工业装备结构分析国家重点实验室, 大连 |
| 徐胜利 |
大连理工大学 工业装备结构分析国家重点实验室, 大连 |
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| Abstract: |
| As special load-bearing structures,thin-walled sandwich structures have been widely used in aerospace equipment,such as the synchronization ring structure in an engine tail nozzle.Recently,3D printing of complex thin-walled sandwich structures can be achieved owing to the development of emerging additive manufacturing (AM) technology.However,there are still several process constraints in direct 3D printing of topologically optimized shapes in practical applications.One of the main constraints is that an optimized structure has a large amount of overhanging areas that cannot be manufactured with AM.This paper mainly aims to design double-skin stiffened sandwich structures by combining the topology optimization method and AM which can simultaneously optimize the stiffener layout and the distribution of non-uniform lattice microstructures.Besides,the mechanical performance of the structure and the self-supporting process constraints are considered to solve the overhanging problem.In order to improve the computational efficiency,a novel implementation of the homogenization method is used to solve the equivalent stiffness coefficients for the lattice structures,which can be adapted to different complex lattice configurations.Finally,the synchronous ring engineering structure is taken as an example of topology optimization.The optimization result indicates that the proposed methods in this paper can carry out the concurrent optimization of stiffeners and lattice in the double-skin sandwich structure,which provides a new way to design lightweight aerospace structures. |
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