Analysis of the hydro-mechanical behaviour of flax fibre-reinforced composites: Assessment of hygroscopic expansion and its impact on internal stress

Chilali, Abderrazak; Assarar, Mustapha; Zouari, Wajdi; Kébir, Hocine; Ayad, Rézak

doi:10.1016/j.compstruct.2018.08.037

Cited by 29 publications

(15 citation statements)

References 40 publications

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“…This indicates that the jute fibre present the different diffusion behavior when they are taken separately and mixed into the composites. This tendency has been already observed in flax/epoxy composite [41]. According to Chilali et al [41], it can be explained by the fact that volume of flax fibre is reduced due to the confine of epoxy resin.…”

Section: Finite Element Simulationmentioning

confidence: 71%

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3D finite element modeling of water diffusion behavior of jute/PLA composite based on X-ray computed tomography

Jiang

et al. 2020

Composites Science and Technology

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A three-dimensional (3D) finite element (FE) modeling approach, which includes the true internal microstructure of short plant fibre reinforced composites, is proposed to accurately simulate water diffusion behavior. The volume fraction, dimension and orientation distribution of jute fibres in a jute/PLA composite were acquired by segmentation of X-ray computed tomographs (XCT). Surface meshes of the jute fibre and PLA matrix were imported into Abaqus Finite Element (FE) software to establish a 3D model that was used to simulate water diffusion behavior at 23ºC. The predicted results were in good agreement with experimental measurements.

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Section: Finite Element Simulationmentioning

confidence: 71%

“…This tendency has been already observed in flax/epoxy composite [41]. According to Chilali et al [41], it can be explained by the fact that volume of flax fibre is reduced due to the confine of epoxy resin. This could explain the difference diffusion coefficient when it is confined in the matrix and when it is aged solely.…”

Section: Finite Element Simulationmentioning

confidence: 71%

3D finite element modeling of water diffusion behavior of jute/PLA composite based on X-ray computed tomography

Jiang

et al. 2020

Composites Science and Technology

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“…Ocean energy devices made of composite materials operate in a very severe environment, and the selected materials must be thoroughly qualified to reduce the risk of failure in service [4]. Water uptake in this family of materials as well as its effect on their mechanical behaviour, treated as an uncoupled phenomenon, has been widely studied [5][6][7][8][9][10][11][12]. According to Aoki et al [13], the water is responsible for Appl.…”

Section: Introductionmentioning

confidence: 99%

Seawater Effect on Fatigue Behaviour of Notched Carbon/Epoxy Laminates

et al. 2021

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This paper studies the effect of seawater immersion on the fatigue behavior of notched carbon/epoxy laminates. Rectangular cross-section specimens with a central hole were immersed in natural and artificial seawater for different immersion times (0, 30 and 60 days), being the water absorption rate evaluated over time. After that, fatigue tests were performed under uniaxial cyclic loading using a stress ratio equal to 0.1. After the tests, the optical microscopy technique allowed the examination of the failure micro-mechanisms at the fracture surfaces. The results showed that saturation appeared before 30 days of immersion and that water absorption rates were similar for natural and artificial seawater. The S–N curves showed that the seawater immersion affects the fatigue strength, but there were no relevant effects associated with the type of seawater. Moreover, it was also clear that fatigue life was similar for long lives, close to 1 million cycles, regardless of the immersion time or the type of seawater. On the contrary, for short lives, near 10 thousand cycles, the stress amplitude of dry laminates was 1.2 higher than those immersed in seawater. The failure mechanisms were similar for all conditions, evidencing the fracture of axially aligned fibres and longitudinal delamination between layers.

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“…The major components of natural fibers are cellulose, hemi-cellulose and pectin. Research has indicated that flax fiber sheets and their corresponding composites have mechanical properties similar to those of glass fiber composites [11][12][13][14]. It can thus fully satisfy the requirements for the capacity of structural materials in civil engineering [15].…”

Section: Introductionmentioning

confidence: 99%

Shear Capacity of RC Beams Strengthened with Flax Fiber Sheets Grafted with Nano-TiO2

Wang

Xian

2020

Materials

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Flax fiber sheets provide the advantages of high specific strength, a short growth cycle, environmental friendliness, wide availability, and low cost. Therefore, in this study, the shear capacities of reinforced concrete (RC) beams strengthened with ordinary flax fiber sheets, flax fiber sheets grafted with nano-TiO 2 , and unidirectional basalt fiber sheets were compared. The bearing characteristics and failure modes of RC beams strengthened with flax fiber sheets were investigated. The results showed that after reinforcement with flax fiber sheets, the bearing capacity and mid-span deflection of the RC beams are considerably improved, and the reinforcing effect of flax fiber sheets grafted with nano-TiO 2 is greater than that of unmodified flax fiber sheets. After reinforcement with flax fiber sheets grafted with nano-TiO 2 , the shear capacity of the RC beams is considerably improved to 653 kN, which is 72.8% higher than that of the unreinforced RC beams. Meanwhile, the mid-range deflection of the beam reached 14.6 mm, which is 75.9% higher than that of the unreinforced RC beams.surface morphology of the flax fiber sheets, but it can also transform the hydrophilic surface into a lipophilic surface, which improves the compatibility of the flax fiber monofilament with epoxy resin [15,16]. After grafting, a nanoparticle layer structure is produced on the surface of the flax fiber. This can create new covalent bonds, such as -Ti-O-Si-and -Si-O-C-. The degree of defects on the surface of the flax fiber sheets is reduced, and a nano-reinforced epoxy resin composite layer is formed between the flax fiber sheets and the epoxy resin, which fully exerts the reinforcing effect of the nano-TiO 2 [15,17].In this study, the shear capacity, bearing characteristics, and failure modes of reinforced concrete (RC) beams and RC beams strengthened with ordinary flax fiber sheets, unidirectional basalt fiber sheets, and flax fiber sheets grafted with nano-TiO 2 were analyzed and compared. An equation for the shear bearing capacity of RC beams strengthened with flax fiber sheets was also proposed. Materials and Methods Materials and ReagentsThe RC beam was cast with commercial concrete. The concrete grade was C30, water-cement ratio was 0.42, and ratio of cement:water:sand:gravel was 360:151:632:1282 by weight. The cement was Swan brand P.O grade 42.5 ordinary Portland cement, produced by the Harbin Cement Factory of the Jilin Yatai Group, China. The maximum particle size of the coarse aggregate was approximately 25 mm. The measured concrete slump was 43 mm [18]. After pouring was completed, the RC beam was continuously watered at room temperature for 7 days, after which it was removed from the mold and rinsed until 28 days. According to the requirements in the standards for the test of mechanical properties of ordinary concrete (GB/T 50081-2011) [18], the compressive strength of the concrete cube (100 mm × 100 mm) was measured to be 38.2 ± 0.3 MPa.The vertical, structural, and erecting steel rebars were HRB400 grade ordinary hot ro...

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Analysis of the hydro-mechanical behaviour of flax fibre-reinforced composites: Assessment of hygroscopic expansion and its impact on internal stress

Cited by 29 publications

References 40 publications

3D finite element modeling of water diffusion behavior of jute/PLA composite based on X-ray computed tomography

3D finite element modeling of water diffusion behavior of jute/PLA composite based on X-ray computed tomography

Seawater Effect on Fatigue Behaviour of Notched Carbon/Epoxy Laminates

Shear Capacity of RC Beams Strengthened with Flax Fiber Sheets Grafted with Nano-TiO2

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