Effect of Moisture in Flax Fibres on the Quality of their Composites

Moudood, Abdul; Hall, Wayne; Öchsner, Andreas; Li, Huaizhong; Rahman, Anisur; Francucci, Gastón Martín

doi:10.1080/15440478.2017.1414651

Cited by 53 publications

(39 citation statements)

References 45 publications

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“…More than 10% of the air's moisture content can be absorbed by flax fibers within one hour at 90% RH. These results are quite consistent with a recent study 44 , where researchers found equilibrium moisture absorption is almost double (14.3%) at 95% RH than that at 70% RH. Interestingly, all the fibers reached the equilibrium moisture content at ambient temperature within 60 minutes regardless of the RH value ( Figure 6).…”

Section: Moisture Absorption Of Flax Fiberssupporting

confidence: 93%

Flax fiber and its composites: An overview of water and moisture absorption impact on their performance

Moudood

Rahman

Öchsner

et al. 2018

Journal of Reinforced Plastics and Composites

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155

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Contemporary researchers have specified that natural flax fiber is comparable with synthetic fibers due to its unique physical and mechanical characteristics which have been recognized for decades. Flax fiber reinforced composites have the potential for wide usage in sport and maritime industries, and as automotive accessories. In addition, this composite is in the development stages for future applications in the aeronautical industry. However, designing the flax composite parts is a challenging task due to the great variability in fiber properties. This is caused by many factors, including the plant origin and growth conditions, plant age, location in the stem, fibers extraction method, and the fact that there is often a non-uniform cross-section of the fibers. Furthermore, the water and moisture absorption tendency of the flax fibers and their composites and the consequent detrimental effects on their mechanical performance are also major drawbacks. Fibers may soften and swell with absorbed water molecules, which could affect the performance of this bio-composite. Flax fibers' moisture absorption propensity may lead to a deterioration of the fiber-matrix interface, weakening the interfacial strength and ultimately degrading the quality of the composite. This review represents a brief summary of the main findings of research into flax fiber reinforced composites, focusing on the challenges of its water and moisture absorption behavior on their performance.

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Section: Moisture Absorption Of Flax Fiberssupporting

confidence: 93%

Flax fiber and its composites: An overview of water and moisture absorption impact on their performance

Moudood

Rahman

Öchsner

et al. 2018

Journal of Reinforced Plastics and Composites

Self Cite

155

View full text Add to dashboard Cite

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“…A des taux d'humidité é levé s, l'augmentation importante de la teneur en eau du composite peut ê tre corré lé e avec un comportement similaire des fibres de chanvre. Un comportement similaire a é té observé dans la litté rature sur des fibres cellulosiques et attribué aux phénomènes d'agglomération des molécules d'eau de par la pré sence de forces de tension de surface au sein des capillarité s [17,18].…”

Section: Isothermes De Sorptionunclassified

Hygroscopic and Mechanical Properties of Hemp Fibre Reinforced Biocomposites

Réquilé¹,

Duigou²,

Bourmaud³

et al. 2019

RCMA

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Mainly used for the paper industry, hemp fibres present a high potential for valorisation in new industrial of semi-structural or structural composites material applications. To reach certain markets, it is inevitable to certify their behaviour and durability in humid environment which is currently lacking in the literature. This article provides a better insight into the moisture sorption, on a wide range of relative humidity (HR), from 9 % to 98 %, and its effect on the evolution of the tensile behaviour and performances of hemp/epoxy unidirectional biocomposites. Tensile behaviour is significantly modified by moisture content with nonlinear behaviour becoming more evidenced. Increase of moisture leads to an exponential decay of tensile modulus but a non-monotonic evolution through an optimum of tensile stress and strain at break. Complex compressive hygroscopic stress state at the fibre/matrix interface is hypothesised so that load transfer is kept until a moisture content threshold is reached and moisture induced degradation triggered. RÉSUMÉ : Principalement utilisées dans l'industrie papetiè re, les fibres de chanvre pré sentent un fort potentiel de valorisation dans de nouvelles applications industrielles de maté riaux composites semi-structuraux ou structuraux. Pour atteindre certains marché s, il est iné vitable de valider leur comportement et leur durabilité en milieu humide, domaine encore lacunaire dans la litté rature. Cet article donne un meilleur aperç u de teneur en eau sur une large gamme d'humidité relative (HR), de 9 % à 98 % et de son effet sur l'évolution des performances des biocomposites unidirectionnels chanvre/é poxy. Le comportement en traction est considé rablement modifié par la teneur en eau, le comportement non liné aire devenant de plus en plus marqué. L'élévation de l'humidité entraine une diminution exponentielle du module de traction et une é volution non monotone des contraintes et dé formations maximales, de par la présence d'un optimum. Un état de contrainte de compression hygroscopique à l'interface fibre/matrice est supposé de faç on à ce que le transfert de charge soit conservé jusqu'à ce qu'un seuil de teneur en eau soit atteint et que des dégradations induites par l'humidité apparaissent.

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“…Le module tangent d'un maté riau composite dé pendant fortement des proprié té s de ses composants et le polypropylè ne n'é tant pas sensible à l'humidité , la variation observé e ici ê tre due à l'é volution des proprié té s des fibres vé gé tales et notamment au ramollissement causé par l'humidité . Des variations similaires ont é té dé crites dans la litté rature pour des fibres de lin [42] ainsi que des composites unidirectionnels renforcé s par des fibres de lin [43]. Par consé quent, la dé formation augmente avec la diminution du module tangent avec la plastification des fibres de lin et du glissement du ré seau fibreux.…”

Section: Hygroexpansionunclassified

Influence of the Nonwoven Biocomposite’s Microstructure on Its Hygromechanical Behaviour

Gager¹,

Duigou²,

Bourmaud³

et al. 2019

RCMA

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This study aims to investigate the evolution of hygromechanical properties of flax nonwoven PP composites in a wide range of environmental Relative Humidity (RH) conditions (10, 33, 50, 75 and 98 % RH). The influence of the fibre nature (glass or flax) and porosity (Φ=5, 30, 50 %) is assessed to improve our understanding of the in-service mechanical behaviour of these composites. Flax nonwoven/PP have a complex mechanical behaviour which only becomes amplified at high moisture contents. However, Relative Humidity variations do not affect the performances of glass/PP composites mechanical, whereas the tangent modulus and strain at rupture of flax/PP composites are strongly modified. Interestingly, stress at yield exhibits an improvement with increasing moisture content. RÉSUMÉ : Cette étude a pour objectif d'étudier l'évolution des propriétés hygromécaniques des composites non-tissé s de lin/polypropylè ne dans une large gamme d'humidité s relatives (HR) (10, 33, 50, 75 et 98 %). L'influence de la nature des fibres (verre ou lin) et de la porosité (Φ=5, 30, 50 %) est évaluée afin d'améliorer notre compréhension du comportement mécanique lors de l'usage de ces composites. Les non-tissé s de lin/PP ont un comportement mé canique complexe qui n'est amplifié qu'avec un taux d'humidité élevé. Alors que les performances mé caniques des composites verre/PP ne sont pas impacté es par la variation d'humidité relative, le module tangent et la déformation à l'écoulement des composites lin/PP sont largement modifié s. Il est inté ressant de noter que la contrainte maximum augmente dans un premier temps avant de stabiliser avec de forts taux d'humidité s.

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Effect of Moisture in Flax Fibres on the Quality of their Composites

Cited by 53 publications

References 45 publications

Flax fiber and its composites: An overview of water and moisture absorption impact on their performance

Flax fiber and its composites: An overview of water and moisture absorption impact on their performance

Hygroscopic and Mechanical Properties of Hemp Fibre Reinforced Biocomposites

Influence of the Nonwoven Biocomposite’s Microstructure on Its Hygromechanical Behaviour

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