Creep behaviour of single hemp fibres. Part II: Influence of loading level, moisture content and moisture variation

Guicheret-Retel, Violaine; Cissé, Ousseynou; Placet, Vincent; Beaugrand, Johnny; Pernes, Miguel; Boubakar, M. Lamine

doi:10.1007/s10853-014-8768-0

Cited by 24 publications

(19 citation statements)

References 15 publications

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“…Isotherms of water vapour desorption/sorption measurements were carried out using a Dynamic Vapour Sorption (DVS) instrument from Hiden Isochema Ltd. (UK). The procedure is similar to the one described in Guicheret-Retel [34]. In this study, the quantity used for both replicates was approx.…”

Section: Water Absorption Testsmentioning

confidence: 99%

Exploring the potential of waste leaf sheath date palm fibres for composite reinforcement through a structural and mechanical analysis

Bourmaud¹,

Dhakal²,

Habrant³

et al. 2017

Composites Part A: Applied Science and Manufacturing

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International audienceThis work proposes a multi-scale study of the properties of leaf sheath date palm fibres currently considered as agricultural waste. Firstly, by using optical and electronic microscopy, two main types of bundles were identified which have profoundly different structures. Biochemical analysis and X-ray diffraction (XRD) revealed a low degree of crystallinity but a significant lignin content of about 17% giving the bundles a very cohesive structure as well as a good thermal stability in addition to a singular behaviour in dynamic vapour sorption. An average cell wall stiffness in the order of 16 GPa was highlighted by Atomic Force Microscopy in mechanical mode but tensile tests on bundles have revealed low stiffness and strength but a high elongation. These results combined with the cellular structure of these bundles, provides the potential of these wastes as cost effective and environmentally friendly composite reinforcements for high energy absorption and improved acoustics functions. (C) 2017 Elsevier Ltd. All rights reserved

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Section: Water Absorption Testsmentioning

confidence: 99%

Exploring the potential of waste leaf sheath date palm fibres for composite reinforcement through a structural and mechanical analysis

Bourmaud¹,

Dhakal²,

Habrant³

et al. 2017

Composites Part A: Applied Science and Manufacturing

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“…The viscoelastic parameters (β T , β T T , β LT ) were identified using inverse method from creep tests on single hemp fibres, combined with the use of the aforementioned spectral model and a hybrid minimisation algorithm [42], [43].…”

Section: Constitutive Lawmentioning

confidence: 99%

Nonlinear tensile behaviour of elementary hemp fibres: a numerical investigation of the relationships between 3D geometry and tensile behaviour

et al. 2017

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Nonlinear tensile behaviour of elementary hemp fibres: a numerical investigation of the relationships between 3D geometry and tensile behaviour.Abstract Experimental observations shown that most of plant fibres are characterised by an intricate structure, morphology and organisation. This complex geometrical characteristics may affect the mechanical behaviour of this kind of natural fibres and contribute to the high variability of their mechanical properties. So, this study proposes a numerical investigation on the relationship between the cross-section shape of primary hemp bast fibres and their tensile behaviour. A 3D viscoelastic model based on finite element method is used for this study. Real and elliptical simplified cross-section shapes are considered. Results of the tensile test simulations clearly show the strong influence of the degree of ellipticity on the tensile response of the fibre, and more exactly on the shape of the non-linearity of the response. Results also show that this morphologic effect is strongly related and coupled to structural parameters and physical mechanisms, such as the cellulose microfibrils angle and the viscoelastic behaviour of the material of the fibre wall. Geometric issues could then contribute to explain the different types of tensile behaviour experimentally observed and deserve to be taken into account in plant fibre models.

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“…La forme sigmoï dale de la courbe de sorption rentre dans la classification des diffé rents types d'isothermes de sorption donné e par l'Union internationale de chimie pure et appliqué e (IUPAC) comme é tant de type II. Ce type de courbe de sorption isotherme est caracté ristique d'une absorption multimolé culaire au cours de laquelle les molé cules d'eau s'accumulent couche par couche [14] et est gé né ralement observé lors de l'étude de sorption d'eau sur des composites cellulosiques hydrophiles et dans une plus large mesure sur des composites à fibres vé gé tales [15,16]. Compte tenu du comportement des courbes, les isothermes de sorption peuvent ê tre dé crits par le modè le mathé matique de Park selon la formule suivante :…”

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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Creep behaviour of single hemp fibres. Part II: Influence of loading level, moisture content and moisture variation

Cited by 24 publications

References 15 publications

Exploring the potential of waste leaf sheath date palm fibres for composite reinforcement through a structural and mechanical analysis

Exploring the potential of waste leaf sheath date palm fibres for composite reinforcement through a structural and mechanical analysis

Nonlinear tensile behaviour of elementary hemp fibres: a numerical investigation of the relationships between 3D geometry and tensile behaviour

Hygroscopic and Mechanical Properties of Hemp Fibre Reinforced Biocomposites

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