Stiffness tailoring in sinusoidal lattice structures through passive topology morphing using contact connections
Structures with adaptive stiffness characteristics present an opportunity to meet competing design requirements, thus achieving greater efficiency by the reconfiguration of their topology. Here, the potential of using changes in the topology of planar lattice structures is explored to achieve this d...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-02-01
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| Series: | Materials & Design |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127523000643 |
| _version_ | 1811158475201314816 |
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| author | Venkatesh Sundararaman Matthew P. O’Donnell Isaac V. Chenchiah Gearóid Clancy Paul M. Weaver |
| author_facet | Venkatesh Sundararaman Matthew P. O’Donnell Isaac V. Chenchiah Gearóid Clancy Paul M. Weaver |
| author_sort | Venkatesh Sundararaman |
| collection | DOAJ |
| description | Structures with adaptive stiffness characteristics present an opportunity to meet competing design requirements, thus achieving greater efficiency by the reconfiguration of their topology. Here, the potential of using changes in the topology of planar lattice structures is explored to achieve this desired adaptivity and observe that lattice structures with rectangle-like unit-cells may undergo elastic buckling or bending of cell walls when subject to longitudinal compression. Under sufficient load intensity, cell walls can deform and contact neighbouring cells. This self-contact is harnessed to change the topology of the structure to that of a kagome-like lattice, thereby establishing new load paths, thus enabling enhancement, in a tailored manner, of the effective compressive and shear stiffness of the lattice. Whilst this phenomenon is independent of characteristic length scale, we focus on macroscopic behaviour (lattices of scale ≈ 200 mm). Experimentally observed responses of 3D-printed lattices correlate excellently with finite element analysis and analytical stiffness predictions for pre- and post-contact topologies. The role of key geometric and stiffness parameters in critical regions of the design space is explored through a parametric study. The non-linear responses demonstrated by this topology morphing lattice structure may offer designers a new route to tailor elastic characteristics. |
| first_indexed | 2024-04-10T05:25:21Z |
| format | Article |
| id | doaj.art-f1f9b990c1ae4341abe29e0fdc9428e5 |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-04-10T05:25:21Z |
| publishDate | 2023-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj.art-f1f9b990c1ae4341abe29e0fdc9428e52023-03-08T04:13:42ZengElsevierMaterials & Design0264-12752023-02-01226111649Stiffness tailoring in sinusoidal lattice structures through passive topology morphing using contact connectionsVenkatesh Sundararaman0Matthew P. O’Donnell1Isaac V. Chenchiah2Gearóid Clancy3Paul M. Weaver4Bernal Institute, School of Engineering, University of Limerick, Limerick, Ireland; Bristol Composites Institute (CoSEM), University of Bristol, Bristol, UK; Corresponding author.Department of Engineering Design and Mathematics, University of the West of England, Bristol, UKSchool of Mathematics, University of Bristol, Bristol, UKBernal Institute, School of Engineering, University of Limerick, Limerick, IrelandBernal Institute, School of Engineering, University of Limerick, Limerick, Ireland; Bristol Composites Institute (CoSEM), University of Bristol, Bristol, UKStructures with adaptive stiffness characteristics present an opportunity to meet competing design requirements, thus achieving greater efficiency by the reconfiguration of their topology. Here, the potential of using changes in the topology of planar lattice structures is explored to achieve this desired adaptivity and observe that lattice structures with rectangle-like unit-cells may undergo elastic buckling or bending of cell walls when subject to longitudinal compression. Under sufficient load intensity, cell walls can deform and contact neighbouring cells. This self-contact is harnessed to change the topology of the structure to that of a kagome-like lattice, thereby establishing new load paths, thus enabling enhancement, in a tailored manner, of the effective compressive and shear stiffness of the lattice. Whilst this phenomenon is independent of characteristic length scale, we focus on macroscopic behaviour (lattices of scale ≈ 200 mm). Experimentally observed responses of 3D-printed lattices correlate excellently with finite element analysis and analytical stiffness predictions for pre- and post-contact topologies. The role of key geometric and stiffness parameters in critical regions of the design space is explored through a parametric study. The non-linear responses demonstrated by this topology morphing lattice structure may offer designers a new route to tailor elastic characteristics.http://www.sciencedirect.com/science/article/pii/S0264127523000643Sinusoidal latticeGlobal bucklingTopology morphingContact connectionsStiffness tailoring |
| spellingShingle | Venkatesh Sundararaman Matthew P. O’Donnell Isaac V. Chenchiah Gearóid Clancy Paul M. Weaver Stiffness tailoring in sinusoidal lattice structures through passive topology morphing using contact connections Materials & Design Sinusoidal lattice Global buckling Topology morphing Contact connections Stiffness tailoring |
| title | Stiffness tailoring in sinusoidal lattice structures through passive topology morphing using contact connections |
| title_full | Stiffness tailoring in sinusoidal lattice structures through passive topology morphing using contact connections |
| title_fullStr | Stiffness tailoring in sinusoidal lattice structures through passive topology morphing using contact connections |
| title_full_unstemmed | Stiffness tailoring in sinusoidal lattice structures through passive topology morphing using contact connections |
| title_short | Stiffness tailoring in sinusoidal lattice structures through passive topology morphing using contact connections |
| title_sort | stiffness tailoring in sinusoidal lattice structures through passive topology morphing using contact connections |
| topic | Sinusoidal lattice Global buckling Topology morphing Contact connections Stiffness tailoring |
| url | http://www.sciencedirect.com/science/article/pii/S0264127523000643 |
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