Influence of environmental relative humidity on the tensile and rotational behaviour of hemp fibres

Placet, Vincent; Cissé, Ousseynou; Boubakar, M. Lamine

doi:10.1007/s10853-011-6191-3

Cited by 114 publications

(107 citation statements)

References 35 publications

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“…The effect of humidity (up to 90% RH) on the mechanical properties of elementary natural fibres (hemp) has already been reported in literature [32]. According to these studies, the Young's modulus increases with humidity content, while tensile strength increases until 70% RH.…”

Section: Composite Performance (3 Pbt)mentioning

confidence: 86%

Effect of humidity during manufacturing on the interfacial strength of non-pre-dried flax fibre/unsaturated polyester composites

Fuentes

Ting

Dupont‐Gillain

et al. 2016

Composites Part A: Applied Science and Manufacturing

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The influence of moisture content in the environment during manufacture of a novel cobalt-free UP matrix reinforced with flax fibres, on the fibre-matrix adhesion was studied. Flax surface energy was experimentally determined by measuring contact angles on technical fibres, using the Wilhelmy technique and the acid-base theory. The mechanical strength of the interface under different humidity conditions was characterized by the critical local value of interfacial shear stress, τ d , at the moment of crack initiation, which was assessed by single-fibre pull-out tests. Differential scanning calorimetry and x-ray photoelectron spectroscopy analysis gave further insight into the topic. The results suggest that the effect of humidity during manufacturing on the composite interface might be limited. However, longitudinal composite strength decreased somewhat for composites produced in humid conditions, showing that there is some detrimental effect of high levels of moisture during cure on the fibre mechanical performance, likely caused by some fibre degradation.

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Section: Composite Performance (3 Pbt)mentioning

confidence: 86%

Effect of humidity during manufacturing on the interfacial strength of non-pre-dried flax fibre/unsaturated polyester composites

Fuentes

Ting

Dupont‐Gillain

et al. 2016

Composites Part A: Applied Science and Manufacturing

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“…These additional strains measured when water content increases in fibre could result from a change both in elastic and inelastic properties of the fibre. In a previous work, we observe a great influence of humidity on the apparent rigidity of such fibres [2]. Using this type of experimental protocol, elastic and inelastic contributions cannot be deconvoluted.…”

Section: Moisture Levelmentioning

confidence: 94%

“…As for quasi-static tensile tests [2], we preferred a deterministic approach based on a same fibre. Replicates were used to confirm the results we present here.…”

Section: Moisture Levelmentioning

confidence: 99%

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

et al. 2014

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This work investigates the tensile creep behaviour of single hemp fibres under constant and cyclic loading coupled to constant or variable moisture content environment. Results show that the primary creep strain rate of such fibres decreases with the increasing stress, while the secondary creep strain rate increases. Load cycling at an average load higher than constant creep load produces a large additional extra creep strain and an increase of the creep rate. Both primary and secondary creep strain rates increase with the increasing moisture content. More creep is also observed in cyclic humidity conditions than in a constant environment at the highhumidity. In agreement with some observations on synthetic fibres, we showed that this accelerated creep is only observed for high moisture cycling rates. This mechanosorptive effect is consistent with sorption-induced stressgradient explanations proposed in literature.

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“…-The testing speed, as natural fibre bundles show viscoelastic behaviour [23][24][25][26][27]. -The climate (temperature and humidity) as cellulosic and pectic substances show hygroscopic behaviour changing their properties with changes in relative humidity [22,[27][28][29][30][31]. -The compliance of the testing machine and the clamping of the tested element (causing potential slippage) strongly affecting strain and modulus [32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Scatter in tensile properties of flax fibre bundles: influence of determination and calculation of the cross-sectional area

Haag

Müssig

2016

J Mater Sci

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The scatter in tensile properties induced by the determination and calculation method of the cross-sectional area (CSA) of bast fibre bundles is almost as high as the scatter found in the literature. Different methods (light microscopy, high resolution flat-bed scanning, and laser-based fibre dimensional analysis) were applied to exactly the same flax fibre bundles prior to tensile testing, and different approaches for the calculation of the CSA were applied. The CSA method alone is introducing up to 300 % of variation in tensile strength data. These results show that there is a strong need for standards and standardisation of fibre bundle testing. Care has to be taken when comparing results from studies using slightly different methods.

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Influence of environmental relative humidity on the tensile and rotational behaviour of hemp fibres

Cited by 114 publications

References 35 publications

Effect of humidity during manufacturing on the interfacial strength of non-pre-dried flax fibre/unsaturated polyester composites

Effect of humidity during manufacturing on the interfacial strength of non-pre-dried flax fibre/unsaturated polyester composites

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

Scatter in tensile properties of flax fibre bundles: influence of determination and calculation of the cross-sectional area

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