Multi-stable composite twisting structure for morphing applications
| Autor: | Paul M. Weaver, Stephen Daynes, Xavier Lachenal |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Flexibility (engineering)
Engineering Bistability business.industry General Mathematics General Engineering Structure (category theory) General Physics and Astronomy Stiffness Structural engineering Degrees of freedom (mechanics) Morphing Simple (abstract algebra) medicine medicine.symptom business Material properties |
| Zdroj: | Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences. 468:1230-1251 |
| ISSN: | 1471-2946 1364-5021 |
| DOI: | 10.1098/rspa.2011.0631 |
| Popis: | Conventional shape-changing engineering structures use discrete parts articulated around a number of linkages. Each part carries the loads, and the articulations provide the degrees of freedom of the system, leading to heavy and complex mechanisms. Consequently, there has been increased interest in morphing structures over the past decade owing to their potential to combine the conflicting requirements of strength, flexibility and low mass. This article presents a novel type of morphing structure capable of large deformations, simply consisting of two pre-stressed flanges joined to introduce two stable configurations. The bistability is analysed through a simple analytical model, predicting the positions of the stable and unstable states for different design parameters and material properties. Good correlation is found between experimental results, finite-element modelling and predictions from the analytical model for one particular example. A wide range of design parameters and material properties is also analytically investigated, yielding a remarkable structure with zero stiffness along the twisting axis. |
| Databáze: | OpenAIRE |
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