Generative design of hierarchical truss structures with desired stiffness and strength: Recursive multiscale topology optimization based on powder bed fusion

IF 5.6 1区 工程技术 Q1 ENGINEERING, CIVIL Engineering Structures Pub Date : 2025-03-11 DOI:10.1016/j.engstruct.2025.120016
Yizhuo Liu , Hao Hua , Zijian Jia , Ludger Hovestadt
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Abstract

The stiffness and strength of uniaxial compressive material can be equivalently realized by a hierarchical truss structure. This work fills the conceptual gap between weight minimization of single truss and the design of hierarchical truss metamaterial, resulting in the formulation of heterogeneous non-periodic structures. Multiscale topology optimization integrated with additive manufacturing (AM) leads to disruptive innovation in construction. The structural hierarchy plays a pivotal role in the creation of bulk material properties. Therefore, a systematic understanding of the cross-level behavior is critical. A rod with the desired stiffness and strength is implemented with an optimized truss with equivalent mechanical properties while using less material. Euler’s critical problem is transformed into the global buckling problem of the truss at the lower level of hierarchy. The recursive algorithm constructs and simultaneously searches for the best structure of multi-level hierarchy. A series of uniaxial compression tests compared the differences between the theoretical model and the specimens produced by powder bed fusion (PBF). The truss joint geometry for PBF was tuned to approximate the stiffness and stability predicated by the mathematical model. Despite the AM imperfection, the statistical mechanical properties are consistent across specimens. 3D-printed trusses can be assembled by welding or bolting connections into larger structures in practice. Compared with solid material with equivalent stiffness and strength, the hierarchical fusiform trusses save significant amounts of material. The cross-level map between the mechanical behavior from neighboring levels of hierarchy facilitates the estimation of the upper bound of the levels of hierarchy.
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来源期刊
Engineering Structures
Engineering Structures 工程技术-工程:土木
CiteScore
10.20
自引率
14.50%
发文量
1385
审稿时长
67 days
期刊介绍: Engineering Structures provides a forum for a broad blend of scientific and technical papers to reflect the evolving needs of the structural engineering and structural mechanics communities. Particularly welcome are contributions dealing with applications of structural engineering and mechanics principles in all areas of technology. The journal aspires to a broad and integrated coverage of the effects of dynamic loadings and of the modelling techniques whereby the structural response to these loadings may be computed. The scope of Engineering Structures encompasses, but is not restricted to, the following areas: infrastructure engineering; earthquake engineering; structure-fluid-soil interaction; wind engineering; fire engineering; blast engineering; structural reliability/stability; life assessment/integrity; structural health monitoring; multi-hazard engineering; structural dynamics; optimization; expert systems; experimental modelling; performance-based design; multiscale analysis; value engineering. Topics of interest include: tall buildings; innovative structures; environmentally responsive structures; bridges; stadiums; commercial and public buildings; transmission towers; television and telecommunication masts; foldable structures; cooling towers; plates and shells; suspension structures; protective structures; smart structures; nuclear reactors; dams; pressure vessels; pipelines; tunnels. Engineering Structures also publishes review articles, short communications and discussions, book reviews, and a diary on international events related to any aspect of structural engineering.
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