Multi-scale investigation into the mechanical behaviour of flax in yarn, cloth and laminate form

Blanchard, Jeanne; Sobey, Adam; Blake, J.I.R.

doi:10.1016/j.compositesb.2015.08.086

Cited by 39 publications

(27 citation statements)

References 32 publications

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“…This supports the good mechanical behavior exhibited by the biocomposites, when compared with results available in literature. respectively, while Blanchard et al [45] for a volume fraction of flax fibers equal to 0.37 in an epoxy matrix, found a flexural strength and stiffness of 114.91 MPa and 6.13 GPa, respectively. In the present case, by adding around 13% by volume of basalt fibers, it is possible to increase the flexural strength and modulus of 43% and 83%, respectively.…”

Section: Quasi-static Flexural Behaviourmentioning

confidence: 95%

Quasi-Static and Low-Velocity Impact Behavior of Intraply Hybrid Flax/Basalt Composites

Sarasini

Tirillò

Ferrante

et al. 2019

Fibers

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In an attempt to increase the low-velocity impact response of natural fiber composites, a new hybrid intraply woven fabric based on flax and basalt fibers has been used to manufacture laminates with both thermoplastic and thermoset matrices. The matrix type (epoxy or polypropylene (PP) with or without a maleated coupling agent) significantly affected the absorbed energy and the damage mechanisms. The absorbed energy at perforation for PP-based composites was 90% and 50% higher than that of epoxy and compatibilized PP composites, respectively. The hybrid fiber architecture counteracted the influence of low transverse strength of flax fibers on impact response, irrespective of the matrix type. In thermoplastic laminates, the matrix plasticization delayed the onset of major damage during impact and allowed a better balance of quasi-static properties, energy absorption, peak force, and perforation energy compared to epoxy-based composites.

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Section: Quasi-static Flexural Behaviourmentioning

confidence: 95%

Quasi-Static and Low-Velocity Impact Behavior of Intraply Hybrid Flax/Basalt Composites

Sarasini

Tirillò

Ferrante

et al. 2019

Fibers

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“…Flax mechanical properties are often considered to be equivalent to E-glass by many authors including Yan et al [2] and Baets et al [3]. A number of authors including Blanchard et al [30] show that the characteristics at one scale don't transfer to another; for example the variability of flax fibres is high but at laminate scale it is the same as E-glass. So there is a need to study flax at the structural level to understand the mechanical behaviour, as underlined by Bambach [6] and Shah et al [5]; but these studies are limited in number.…”

Section: Modelling Capabilities and Implications For Natural Compositesmentioning

confidence: 99%

Modelling the different mechanical response and increased stresses exhibited by structures made from natural fibre composites

Blanchard

Mutlu

Sobey

et al. 2019

Composite Structures

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Natural fibres exhibit improved sustainability and similar mechanical properties to E-glass. However, for laminates there is a larger difference in properties and limited assessments of structural components. An analytical method for grillages is developed which is generally shown to predict the stress to within 5% of an FEA model. The simulations demonstrate a change in structural response between flax and carbon, with flax demonstrating higher stresses than expected for the lower Young's modulus for the same topology. Flax is shown to be more sensitive to transverse Young's modulus than standard composites and a better characterisation of this property is required.

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“…Cependant, les fibres vé gé tales possè dent des proprié té s mé caniques plus faibles, une plus grande capacité d'absorption de l'humidité , une ré sistance plus faible à la tempé rature, et une grande variabilité des propriétés en fonction de l'année de production [1,2]. A l'échelle composite, cette variabilité en termes de propriétés mé caniques est ré duite et similaire à celle des composites renforcé s par des fibres synthé tiques, ce qui rend possible l'utilisation de fibres naturelles en tant que renfort de maté riaux composites [3,4].…”

Section: Introductionunclassified

Improvement of the Weavability of Natural-Fiber Reinforcement for Composite Materials Manufacture

Corbin¹,

Soulat²,

Ferreira³

et al. 2019

RCMA

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Natural fibers are an alternative to man-made fibers for the manufacturing of preforms intended for composite applications. Some of the textile manufacturing processes, such as spinning technology, are not suitable for the production of optimized preforms for composite materials. Those preforms are made of yarns, whose features (twisting in particular) lead to difficulties during impregnation step and to fiber disorientation when compared to the yarn axis. The purpose of this study is to produce woven preforms from flax and hemp rovings, instead of yarns. Rovings, which have a low twist level, are not suitable for weaving technology. An improvement of their mechanical properties with chemical treatment is suggested, and its influence on the feasibility of the weaving process and on the textile and mechanical properties of different scales (fiber, roving, preform and composite scales) is studied. The chemical treatment used leads to an improvement of the roving tenacity and the weavabilty without damaging fibers and composite properties. RÉSUMÉ : Les fibres naturelles repré sentent une alternative aux fibres synthé tiques dans la ré alisation de pré formes pour maté riaux composites. Certains procé dé s de transformation textile, notamment la filature, ne permettent pas l'obtention de préformes optimisées pour les maté riaux composites. Les caracté ristiques des fils constituants ces derniè res, et en particulier leur niveau de torsion, conduisent à des difficultés lors de l'imprégnation du renfort par le polymère et également à des défauts d'orientation des fibres par rapport à l'axe des fils et donc des directions principales du matériau. L'objectif de ce travail est d'élaborer des préformes tissées à l'aide de mèches de lin et de chanvre. Ces mèches présentent un faible taux de torsion comparativement aux fils. En l'état, et du fait de leur faible té nacité , elles ne sont né anmoins pas adapté es à la technologie de tissage. Une amé lioration de leurs proprié té s mé caniques par un traitement chimique est proposé e. Son influence sur la tissabilité et sur les proprié té s textiles et mé caniques aux diffé rentes é chelles fibre, mè che, pré forme et composite est é tudié e. Les ré sultats montrent que le traitement chimique permet alors d'augmenter la ténacité des mè ches et leur tissabilité sans dé grader les proprié té s des fibres et des composites.

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Multi-scale investigation into the mechanical behaviour of flax in yarn, cloth and laminate form

Cited by 39 publications

References 32 publications

Quasi-Static and Low-Velocity Impact Behavior of Intraply Hybrid Flax/Basalt Composites

Quasi-Static and Low-Velocity Impact Behavior of Intraply Hybrid Flax/Basalt Composites

Modelling the different mechanical response and increased stresses exhibited by structures made from natural fibre composites

Improvement of the Weavability of Natural-Fiber Reinforcement for Composite Materials Manufacture

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