Deformation Behaviour of Composites Reinforced with Four Different Linen Flax Yarn Structures

Carpenter, James; Miao, Meng He; Brorens, Peter

doi:10.4028/www.scientific.net/amr.29-30.263

Cited by 9 publications

(3 citation statements)

References 3 publications

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“…Although the causes of the nonlinear stress–strain response of the PFCs (and the resulting stiffness reduction at low strains) are not yet clear [32, 48], they are possibly a result of “nonreversible reorientation” on two length scales: (i) untwisting/stretching of the reinforcing twisted staple fiber yarns [32, 39, 49], and (ii) rigid body rotation, stretching and aligning of the cellulose microfibrils in a single plant fiber [12, 32, 46, 48]. The latter is believed to have a dominant role; particularly as plant single fibers themselves have a non‐linear stress‐strain response to tensile loading.…”

Section: Resultsmentioning

confidence: 99%

The tensile behavior of off‐axis loaded plant fiber composites: An insight on the nonlinear stress–strain response

et al. 2012

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Composites in load‐bearing applications are often exposed to off‐axis loads. For plant fiber composites (PFCs) to be seriously and readily considered in structural applications, knowledge and reliable prediction of their response to off‐axis loads is critical. This article (i) characterizes the stress–strain response, (ii) investigates the tensile properties, and (iii) analyses the fracture modes, of unidirectional flax‐polyester composites subjected to off‐axis tensile loading. A key finding of this study is that due to the nonlinear stress–strain response of PFCs, the apparent stiffness of the composite reduces by ∼30% in the strain range of 0.05 to 0.25%. In addition, through cyclic tests on the composites, the elastic strain limit is found to be only ∼0.15%. This has major implications on the strain range to be used for the determination of the composite elastic Young's modulus. Consequently, it is proposed that the tensile modulus for PFCs should be measured in the strain range of 0.025 to 0.100%. Through comparison with experimental data, conventional composite micromechanical models are found to be adequate in quantitatively describing the tensile behavior of off‐axis loaded PFCs. The application of such models has also enabled the determination of, otherwise difficult to measure, material properties, such as fiber shear and transverse modulus. Off‐axis loaded PFCs fail by three distinct fracture modes in three different off‐axis ranges; each fracture mode produces a unique fracture surface. POLYM. COMPOS. 2012. © 2012 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 99%

The tensile behavior of off‐axis loaded plant fiber composites: An insight on the nonlinear stress–strain response

et al. 2012

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“…Regarding the yarn structure, it could be shown that composites reinforced with twistless or low twisted yarns resulted in higher stiffness and strength performance than those with a higher twist rate. [5][6][7] In addition, a high level of twist decreases the permeability of the yarns. In particular, for textiles with twisted fibre yarns, which need to be impregnated with thermoset binder matrix, an optimum level of twist needs to be found to ensure high yarn permeability but still allow the fibre to be used in processes, such as knitting and weaving.…”

Section: Introductionmentioning

confidence: 99%

“…Higher moulding pressures result in fibre damage and a decrease in mechanical properties. Regarding the yarn structure, it could be shown that composites reinforced with twistless or low twisted yarns resulted in higher stiffness and strength performance than those with a higher twist rate 5 – 7. In addition, a high level of twist decreases the permeability of the yarns.…”

Section: Introductionmentioning

confidence: 99%

Properties of compression moulded new fully biobased thermoset composites with aligned flax fibre textiles

Pohl

Bierer

Natter

et al. 2011

Plastics, Rubber and Composites

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The development of aligned natural fibre reinforced composites utilising biobased thermosets is an essential step towards the manufacture of ecofriendly composite systems. In many cases, the matrix system, which is usually oil based in nature, is disregarded. Therefore, a new fully biobased thermoset composite with aligned flax fibre textiles was developed using a bioderived matrix resin. The thermoset furan resin has recently received interest due to its good environmental profile containing no petrochemicals, using water as solvent and biomass as raw material. The new resin also shows good mechanical performance and excellent fire resistance. In the present study, aligned natural fibre textiles, randomly oriented natural fibre textiles and glass fibre textiles have been hand laid up and impregnated with the furan resin to form prepregs. After precuring, the prepregs were consolidated into composites using an industrial scale compression moulding machine, and their material properties were analysed. The density was calculated by using a computed microtomography system, and tensile tests were carried out. Besides the mechanical properties, the burning and the moisture absorption behaviour have been determined.

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Long Biofibers and Engineered Pulps for High Performance Bioplastics and Biocomposites

Fernyhough

Markotsis

2011

Handbook of Bioplastics and Biocomposites Engineering Applications

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Deformation Behaviour of Composites Reinforced with Four Different Linen Flax Yarn Structures

Abstract: Four types of yarns were made from flax sliver (Linum usitatissimum) as reinforcements in composites: (1) twist-less, (2) two-fold, (3) high-twist singles and (4) medium-twist singles yarns. Flexural, compressive and tensile properties of the epoxy composites were compared.

Cited by 9 publications

References 3 publications

The tensile behavior of off‐axis loaded plant fiber composites: An insight on the nonlinear stress–strain response

The tensile behavior of off‐axis loaded plant fiber composites: An insight on the nonlinear stress–strain response

Properties of compression moulded new fully biobased thermoset composites with aligned flax fibre textiles

Long Biofibers and Engineered Pulps for High Performance Bioplastics and Biocomposites

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