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.
|Number of pages||10|
|Journal||Composites Part A: Applied Science and Manufacturing|
|Early online date||11 Oct 2018|
|Publication status||Published - Jan 2019|
- Smart materials
- Mechanical properties
Le Duigou, A., Keryvin, V., Beaugrand, J., Pernes, M., Scarpa, F., & Castro, M. (2019). Humidity responsive actuation of bioinspired hygromorph biocomposites (HBC) for adaptive structures. Composites Part A: Applied Science and Manufacturing, 116, 36-45. https://doi.org/10.1016/j.compositesa.2018.10.018