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Gager, Victor
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Hygro-mechanical behaviour of non-woven biocomposites with moisture variations
Abstract
This study investigates the evolution of hygromechanical properties of flax/PP nonwoven composites in a wide range of environmental Relative Humidity conditions from 10 to 98% RH. The influence of microstructure with various porosity content (Φ = 5, 30, 50%) on the mechanical and hygroscopic behaviours is studied. The porosity greatly impacts the kinetic of sorption with moisture saturation varying from 9 hours to 15 days with decreasing voids. Tensile behaviour and properties are slightly changed over a range of 10-75% RH but negatively impacted between 75% and 98% RH. Interestingly, unlike the tangent tensile modulus and strain at rupture of flax/PP composites, the yield strength increases until 50% RH and stabilizes over this point; compressive stresses at the fibre/matrix interface induced by flax fibres hygroexpansion are proposed to explain this trend. A quasi-monotonous decrease is also observed in bending properties with the increase in water content in the material.