Humidity responsive actuation of bioinspired hygromorph biocomposites (HBC) for adaptive structures
2019
Le Duigou, Antoine | Keryvin, Vincent | Beaugrand, Johnny | Pernes, Miguel | Scarpa, Fabrizio | Castro, Mickael | Institut de Recherche Dupuy de Lôme (IRDL) ; École Nationale d'Ingénieurs de Brest (ENIB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Centre National de la Recherche Scientifique (CNRS) | Fractionnement des AgroRessources et Environnement (FARE) ; Université de Reims Champagne-Ardenne (URCA)-Institut National de la Recherche Agronomique (INRA) | Unité de recherche sur les Biopolymères, Interactions Assemblages (BIA) ; Institut National de la Recherche Agronomique (INRA) | University of Bristol [Bristol] | CNRS
Hygromorph biocomposites (HBC) possess moisture-induced actuation from bioinspired designs. The present work describes a large experimental and comprehensive database of the hygro-mechanical and bending actuation properties of flax/maleic anhydride grafted polypropylene (MAPP) HBC composites over a large range of moisture variation (10-90% RH) and water immersion. HBCs exhibit a promising responsiveness and reactivity over the whole relative humidity range (10-90% RH), with acceleration and increase of the actuation observed as soon as a 30% RH value is reached. The experimental data are compared to analogous results from an analytical model based on a modified Timoshenko theory, and a finite element model based on the use of classical laminate theory (CLT). We discuss the effects of the hygroscopic properties (beta coefficient) and the design parameters (length/width and thickness ratios) of the composites on the actuation performance.
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