Curvature Induced by Deflection in Thick Meta-Plates

Autor: Mohammad J. Mirzaali, José Bico, Mehdi Habibi, Mahdiyeh Nouri-Goushki, Kenichi Nakatani, Aref Ghorbani, Angelo Accardo, N. Tümer, Amir A. Zadpoor, S. Janbaz, Sebastien J.P. Callens
Přispěvatelé: Delft University of Technology (TU Delft), Wageningen University and Research [Wageningen] (WUR), Physique et mécanique des milieux hétérogenes (UMR 7636) (PMMH), Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Soft Matter (WZI, IoP, FNWI)
Rok vydání: 2021
Předmět:
Zdroj: Advanced Materials
Advanced Materials, Wiley-VCH Verlag, 2021, pp.2008082. ⟨10.1002/adma.202008082⟩
Advanced Materials, 33(30)
Advanced materials, 33(30):2008082. Wiley-Blackwell
Advanced Materials 33 (2021) 30
ISSN: 1521-4095
0935-9648
DOI: 10.1002/adma.202008082⟩
Popis: International audience; The design of advanced functional devices often requires the use of intrinsically curved geometries that belong to the realm of non-Euclidean geometry and remain a challenge for traditional engineering approaches. Here, it is shown how the simple deflection of thick meta-plates based on hexagonal cellular mesostructures can be used to achieve a wide range of intrinsic (i.e., Gaussian) curvatures, including dome-like and saddle-like shapes. Depending on the unit cell structure, non-auxetic (i.e., positive Poisson ratio) or auxetic (i.e., negative Poisson ratio) plates can be obtained, leading to a negative or positive value of the Gaussian curvature upon bending, respectively. It is found that bending such meta-plates along their longitudinal direction induces a curvature along their transverse direction. Experimentally and numerically, it is shown how the amplitude of this induced curvature is related to the longitudinal bending and the geometry of the meta-plate. The approach proposed here constitutes a general route for the rational design of advanced functional devices with intrinsically curved geometries. To demonstrate the merits of this approach, a scaling relationship is presented, and its validity is demonstrated by applying it to 3D-printed microscale meta-plates. Several applications for adaptive optical devices with adjustable focal length and soft wearable robotics are presented.
Databáze: OpenAIRE
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