Towards active stiffness control in pattern-forming pneumatic metamaterials
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arXiv
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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866909533292462080 |
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| author | Faltus, Ondřej Jirásek, Milan Horák, Martin Doškář, Martin Peerlings, Ron Zeman, Jan Rokoš, Ondřej |
| author_facet | Faltus, Ondřej Jirásek, Milan Horák, Martin Doškář, Martin Peerlings, Ron Zeman, Jan Rokoš, Ondřej |
| contents | Pattern-forming metamaterials feature microstructures specifically designed to change the material's macroscopic properties due to internal instabilities. These can be triggered either by mechanical deformation or, in the case of active materials, by other external stimuli, such as pneumatic actuation. We study a two-dimensional rectangular lattice microstructure which is pneumatically actuated by non-uniform pressure patterns in its voids, and demonstrate that this actuation may lead toifferent instability patterns. The patterns are associated with a significant reduction in the macroscopic stiffness of the material. The magnitude of this reduction can be controlled by different arrangements of the pressure actuation, thus choosing the precise buckled shape of the microstructure. We develop an analytical model and complement it with computational tests on a two-dimensional plane-strain finite element model. We explain the phenomenon and discuss ways of further developing the concept to actively control the stiffness of materials and structures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_19519 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Towards active stiffness control in pattern-forming pneumatic metamaterials Faltus, Ondřej Jirásek, Milan Horák, Martin Doškář, Martin Peerlings, Ron Zeman, Jan Rokoš, Ondřej Applied Physics Pattern-forming metamaterials feature microstructures specifically designed to change the material's macroscopic properties due to internal instabilities. These can be triggered either by mechanical deformation or, in the case of active materials, by other external stimuli, such as pneumatic actuation. We study a two-dimensional rectangular lattice microstructure which is pneumatically actuated by non-uniform pressure patterns in its voids, and demonstrate that this actuation may lead toifferent instability patterns. The patterns are associated with a significant reduction in the macroscopic stiffness of the material. The magnitude of this reduction can be controlled by different arrangements of the pressure actuation, thus choosing the precise buckled shape of the microstructure. We develop an analytical model and complement it with computational tests on a two-dimensional plane-strain finite element model. We explain the phenomenon and discuss ways of further developing the concept to actively control the stiffness of materials and structures. |
| title | Towards active stiffness control in pattern-forming pneumatic metamaterials |
| topic | Applied Physics |
| url | https://arxiv.org/abs/2410.19519 |