Humidity responsive actuation of bioinspired hygromorph biocomposites (HBC) for adaptive structures

Antoine Le Duigou*, Vincent Keryvin, Johnny Beaugrand, Miguel Pernes, Fabrizio Scarpa, Mickael Castro

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

15 Citations (Scopus)
175 Downloads (Pure)


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 (β coefficient) and the design parameters (length/width and thickness ratios) of the composites on the actuation performance.
Original languageEnglish
Pages (from-to)36-45
Number of pages10
JournalComposites Part A: Applied Science and Manufacturing
Early online date11 Oct 2018
Publication statusPublished - Jan 2019


  • Biocomposite
  • Smart materials
  • Moisture
  • Mechanical properties

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