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Topology optimization of 3D shell structures with porous infill

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Acta Mechanica Sinica 2017年第4期33卷 778-791页

作者： Anders Clausen Erik Andreassen ole sigmund Department of Mechanical Engineering Solid MechanicsTechnical University of Denmark 2800 Lyngby Denmark

This paper presents a 3D topology optimization approach for designing shell structures with a porous or void interior. It is shown that the resulting structures are significantly more robust towards load perturbations than completely solid structures optimized under the same conditions. The study indicates that the potential benefit of using porous structures is higher for lower total volume *** to earlier work dealing with 2D topology optimization, we found several new effects in 3D problems. Most notably, the opportunity for designing closed shells significantly improves the performance of porous structures due to the sandwich effect. Furthermore, the paper introduces improved filter boundary conditions to ensure a completely uniform coating thickness at the design domain boundary.

关键词： porous shells topology interior perturbations opportunity dealing earlier stiffness struc

Ultra-broadband edge-state pair for zigzag-interfaced valley Hall insulators

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Science China(Physics,Mechanics & Astronomy) 2022年第5期65卷 81-89页

作者： Jinhao Zhang Fengwen Wang ole sigmund Liang Gao Rasmus E.Christiansen State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhan 430074China Department of Mechanical Engineering Technical University of DenmarkKongens Lyngbv 2800Denmark

The existence of a single topologically protected edge state in the first bulk bandgap for acoustic/elastic valley Hall insulators(VHIs)with zigzag interface configurations(ZICs)is well ***,in this work,we show that an ultra-broadband edgestate pair in this bandgap can be created using the inverse design by topology *** valley Hall insulator design increases the operational bandwidth 121%compared with an existing valley Hall insulator from recent literature and exhibits extreme field confinement,where more than 99%of the field intensity is concentrated within three unit-cells from the ***-way propagation and topological robustness towards small cavity defects are confirmed for the full *** exploitation of such edge-state pairs of valley Hall insulators opens an avenue for realizing broadband confined edge *** tests for disorder and bend defects,we show that the additional ZIC,with a different operational frequency interval,encountered at the defects,degrades the transmission for bend and disorder defects which may prove significant for the application of *** an alternative topology optimization method based on two ZICs,we further increase their common operational bandwidth.

关键词： valley Hall insulators zigzag interface configuration edge-state pair topology optimization

Exploiting Additive Manufacturing Infill in Topology Optimization for Improved Buckling Load

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Engineering 2016年第2期2卷 250-257页

作者： Anders Clausen Niels Aage ole sigmund Section of Solid Mechanics Department of Mechanical Engineering Technical University of Denmark Lyngby DK-2800 Denmark

Additive manufacturing （AM） permits the fabrication of functionally optimized components with high geometrical complexity. The opportunity of using porous infill as an integrated part of the manufactur- ing process is an example of a unique AM feature. Automated design methods are still incapable of fully exploiting this design freedom. In this work, we show how the so-called coating approach to topology optimization provides a means for designing infill-based components that possess a strongly improved buckling load and, as a result, improved structural stability. The suggested approach thereby addresses an important inadequacy of the standard minimum compliance topology optimization approach, in which buckling is rarely accounted for; rather, a satisfactory buckling load is usually assured through a post-processing step that may lead to sub-optimal components. The present work compares the stan- dard and coating approaches to topology optimization for the MBB beam benchmark case. The opti- mized structures are additively manufactured using a filamentary technique. This experimental study validates the numerical model used in the coating approach. Depending on the properties of the infill material, the buckling load may be more than four times higher than that of solid structures optimized under the same conditions.

关键词： Additive manufacturingIn fillTopology optimizationBuckling

A SHORT BIOGRAPHY(Editors)

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Acta Mechanica Sinica 2022年第7期38卷 F0002-F0002页

作者： Lian Shen ole sigmund Yi Sui University of Minnesota USA Technical University of Denmark Denmark Queen Mary University of London UK

*** Shen earned his Bachelor of Sciencedegree in Mechanics and Mechanical Engineering from the Department of Modern Mechanics at University of Science and Technology of China in 1993and his Doctorof Science degree in ... 详细信息

关键词： earned Doctor Massachusetts