Study of hygroscopic stresses in asymmetric biocomposite laminates

The hygro-mechanical behaviour of a bio-sourced composite material (MAPP/flax) is experimentally investigated through the characterization of its moisture diffusion and elastic properties, as well as the in-plane hygroscopic swelling of a unidirectional ply sequence and curvature in the case of an a...

Full description

Saved in:
Bibliographic Details
Published in:Composites science and technology 2019-01, Vol.169, p.7-15
Main Authors: Péron, Mael, Célino, Amandine, Castro, Mickael, Jacquemin, Frédéric, Le Duigou, Antoine
Format: Article
Language:English
Subjects:
Asymmetrical laminate
Asymmetry
Biomedical materials
Composite materials
Compressive properties
Curvature
Elastic properties
Engineering Sciences
Finite difference method
Flax
Hygroscopic stress
Kinetics
Laminates
Lay-up
Layers
Mechanical properties
Mechanics
Mechanics of materials
Moisture
Moisture content
Natural fibre
Reaction kinetics
Sorption
Stress concentration
Stress distribution
Swelling
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The hygro-mechanical behaviour of a bio-sourced composite material (MAPP/flax) is experimentally investigated through the characterization of its moisture diffusion and elastic properties, as well as the in-plane hygroscopic swelling of a unidirectional ply sequence and curvature in the case of an asymmetric lay-up sequence. From these considerations, we propose a hygro-mechanical model for the material behaviour, based on a Fickian diffusion model solved in 1D with a finite difference method, and coupled to a modified mechanical model based on laminate theory. The proposed model takes into account the evolution of the mechanical properties as well as hygroscopic swelling during moisture uptake to predict the stress state during water sorption of a biocomposite. Results show that sorption kinetics is dependent on the lay-up sequence of the biocomposite structure. The stress state determined from the thickness of the asymmetric lay-up shows that most of the plies (approx. 75% of the whole laminate) are subjected to a compressive stress along their in-plane direction transverse to the fibres. This stress distribution may lead to a decrease in the free-volume of the material, thus modifying the hygroscopic properties by reducing its maximum moisture content compared to the unidirectional laminate (the stress distribution being equal to zero for this latter laminate when saturation is reached).
ISSN:0266-3538
1879-1050
DOI:10.1016/j.compscitech.2018.10.027