Effect of hygroscopy on non-impregnated quasi-unidirectional flax reinforcement behaviour

Abida, Marwa; Gehring, Florian; Mars, Jamel; Vivet, Alexandre; Dammak, Fakhreddine; Haddar, Mohamed

doi:10.1016/j.indcrop.2018.11.008

Cited by 12 publications

(8 citation statements)

References 45 publications

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“…Indeed, contrary to most petrosourced composites, PFCs are highly sensitive to hygrothermal conditions and their variation and/or cycling over time [13]. Their monotonic, fatigue and vibrational behaviours are reported to be significantly influenced by such parameters [8,9,[14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Influence of the stress level and hygrothermal conditions on the creep/recovery behaviour of high-grade flax and hemp fibre reinforced GreenPoxy matrix composites

Sala

Gabrion

Trivaudey

et al. 2021

Composites Part A: Applied Science and Manufacturing

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This paper investigates the influence of the stress level and hygrothermal conditions on the creep/recovery behaviour of three high-grade composites made of GreenPoxy and flax and hemp fibres. The results show that the levels of instantaneous, time-delayed and residual strains increase with the applied load and the severity of the environment. The time-delayed strains of the materials are higher in the creep phase than in the recovery phase. A stiffening effect is also observed during the recovery phase. The post-creep viscoelastic properties are then identified using an anisotropic viscoelastic law from the recovery function. The relaxation time function is independent of the stress level and the environmental conditions. The viscous parameter varies with the stress level and increases substantially with severe environmental conditions. The dependence of the creep/recovery behaviour on the stress level is due to the dependence of the stiffening phenomenon and irreversible mechanisms rather than to the viscoelastic behaviour.

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Section: Introductionmentioning

confidence: 99%

Influence of the stress level and hygrothermal conditions on the creep/recovery behaviour of high-grade flax and hemp fibre reinforced GreenPoxy matrix composites

Sala

Gabrion

Trivaudey

et al. 2021

Composites Part A: Applied Science and Manufacturing

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“…Cadu et al (2019) showed that the morphology, the microstructure and the chemical composition of flax fiber bundles change with cyclic hygrothermal ageing (between relative humidity (RH) of 90% and RH of 40%). These modifications could be responsible for the mechanical behavior change according to water content (Abida et al, 2019;Célino et al, 2014;Perrier et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…In plant fiber reinforced polymer composite science, the characterization of the plant reinforcement behavior could be conducted at different scales (fabric, yarn, fiber bundle and elementary fiber). In this study, the behavior analysis at the fabric scale is considered as the macro-scale (Abida et al, 2019). In a scaling down approach, the behavior characterization at the yarn scale (Omrani et al, 2017), is referred to as meso-scale.…”

Section: Introductionmentioning

confidence: 99%

“…Dolatabadi and Kovar (2012), and Kovar and Gupta (2009) studied experimentally and theoretically the tensile and the rupture properties of plain weave fabric, respectively. More recently, Abida et al (2019) conducted an experimental investigation on the influence of water content on the mechanical behavior of a quasi-unidirectional flax fabric and showed a low dispersion of the flax properties at the fabric scale. Kovar and Gupta (2009) proposed an analytical model to predict failure of plain woven fabric based on strain failure criterion and on fabric geometry changes with loading (orientation and length of yarns).…”

Section: Introductionmentioning

confidence: 99%

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Inverse approach for flax yarns mechanical properties identification from statistical mechanical characterization of the fabric

Abida

Baklouti

Gehring

et al. 2020

Mechanics of Materials

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Plant fiber properties, such as morphological and mechanical, are characterized by a large dispersion. Thereby, a statistical analysis is needed to obtain consistent results. An experimental study, conducted on 50 flax yarns, shows that the flax yarn properties (Young's modulus, tensile strength and diameter) follow Gaussian distributions. This approach is obviously reliable, however time-consuming, to get relevant information. An alternative could be the identification of the yarn mechanical properties using an inverse approach, based on tensile tests conducted on flax fabric reinforcement. The aim of this study is to develop a numerical method that allows to identify the statistical distributions of flax yarn properties based on tensile tests conducted on fabric specimens. The proposed strategy relies on two assumptions. On the one hand, fabric is constituted of several yarns acting like springs in parallel. On the other hand, yarns are considered as brittle-elastic materials. Hence, a yarn breaks when the load reaches its failure strength, leading to a loading redistribution to the intact yarns. A comparison of the numerical and experimental results of flax fabric tensile behavior, and of the flax property statistical distributions allows to confirm the performance of this strategy. The results show that the flax fabric tensile behavior is correctly described by the proposed modeling strategy. The average and the standard deviation of the Young's modulus, the tensile strength and the diameter of flax yarns identified from fabric tensile tests via inverse approach are close to those obtained experimentally on individual yarns. Indeed, the measured average diameter of unitary yarns are 244.4 ± 19.2 μm and the fitted one is 2474.8 ± 17.4 μm, the fitting failure strength 292.3 ± 33.4 MPa are close to the experimental 271.2 ± 47.5 MPa. The identified Young's modulus is 9.4 ± 0.9 GPa is lower than the experimental 10.8 ± 1.3 GPa.

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“…5 Moisture has severe effects on the mechanical properties of NFPC. 6 Therefore, drying of fibres becomes essential before preparation of composites.…”

Section: Introductionmentioning

confidence: 99%

Development of bamboo polymer composites with improved impact resistance

Abhilash

Venkatesh

Chauhan

2021

Polymers and Polymer Composites

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Reinforcing thermoplastic polymers with natural fibres tends to improve tensile and flexural strength but adversely affect elongation and impact strength. This limits the application of such composites where toughness is a major criterion. In the present work, bamboo fibre reinforced polypropylene (PP) composites were prepared with bamboo fibre content varying from 30% to 50% with improved impact resistance. Homopolymer and copolymer PP were used as the matrix polymer and an elastomer was used (10% by wt.) as an additive in the formulation. Copolymer based composites exhibited superior elongation and impact strength as compared to homopolymer based composites. The adverse impact of elastomer on tensile and flexural strength was more pronounced in homopolymer based composites. The study suggested that the properties of the bamboo composites can be tailored to suit different applications by varying reinforcement and elastomer percentage.

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Effect of hygroscopy on non-impregnated quasi-unidirectional flax reinforcement behaviour

Cited by 12 publications

References 45 publications

Influence of the stress level and hygrothermal conditions on the creep/recovery behaviour of high-grade flax and hemp fibre reinforced GreenPoxy matrix composites

Influence of the stress level and hygrothermal conditions on the creep/recovery behaviour of high-grade flax and hemp fibre reinforced GreenPoxy matrix composites

Inverse approach for flax yarns mechanical properties identification from statistical mechanical characterization of the fabric

Development of bamboo polymer composites with improved impact resistance

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