Nonlinear tensile behaviour of elementary hemp fibres. Part II: Modelling using an anisotropic viscoelastic constitutive law in a material rotating frame

Trivaudey, Frédérique; Placet, Vincent; Guicheret-Retel, Violaine; Boubakar, M. Lamine

doi:10.1016/j.compositesa.2014.10.020

Cited by 31 publications

(27 citation statements)

References 29 publications

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“…13b), we can notice that the average cyclic-RH creep rate is higher than the constant- This observation also supports the sorption-induced stressgradient explanations proposed by these authors. In a previous work [19], we showed that when considering that the fibre has a constant and cylindrical cross section along its length and using a theoretical model, an axial stress gradient is established across the fibre wall under tensile loading. The axial stress is the highest at the inner face of the cell wall and progressively decreases with the thickness of the cell wall.…”

Section: Moisture Levelmentioning

confidence: 99%

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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Section: Moisture Levelmentioning

confidence: 99%

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

et al. 2014

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“…The 3D model used for this study is based on a model previously developed in our team. It is fully described in [16] and [14]. It is based on macroscopic considerations and uses the continuum mechanics formulation.…”

Section: Modellingmentioning

confidence: 99%

“…In a previous work [27], our team proposed a scenario based on several mechanisms including viscoelastic strain, cellulose microfibrils reorientation and shear strain-induced crystallisation of the amorphous paracrystalline components. These mechanisms were then modelled through an anisotropic viscoelastic constitutive law, describing finite tranformations through a material rotating frame formulation [16]. Results showed that this model is able to correctly simulate the shape of the experimentally observed tensile curves.…”

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confidence: 99%

“…Due to the difficulties related to the experimental reconstruction of the real 3D fibre morphology, a numerical approach is mostly preferred to investigate the relationship between morphology and the tensile behaviour of isolated elementary plant fibres. In this paper, the model developed by Trivaudey et al [16] is associated with different 3D geometries of the fibre, in order to evaluate the influence of the morphology on the fibre tensile behaviour. Real and simplified cross-section shapes are considered and a finite elements modelisation is performed.…”

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Nonlinear tensile behaviour of elementary hemp fibres: a numerical investigation of the relationships between 3D geometry and tensile behaviour

et al. 2017

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Nonlinear tensile behaviour of elementary hemp fibres: a numerical investigation of the relationships between 3D geometry and tensile behaviour.Abstract Experimental observations shown that most of plant fibres are characterised by an intricate structure, morphology and organisation. This complex geometrical characteristics may affect the mechanical behaviour of this kind of natural fibres and contribute to the high variability of their mechanical properties. So, this study proposes a numerical investigation on the relationship between the cross-section shape of primary hemp bast fibres and their tensile behaviour. A 3D viscoelastic model based on finite element method is used for this study. Real and elliptical simplified cross-section shapes are considered. Results of the tensile test simulations clearly show the strong influence of the degree of ellipticity on the tensile response of the fibre, and more exactly on the shape of the non-linearity of the response. Results also show that this morphologic effect is strongly related and coupled to structural parameters and physical mechanisms, such as the cellulose microfibrils angle and the viscoelastic behaviour of the material of the fibre wall. Geometric issues could then contribute to explain the different types of tensile behaviour experimentally observed and deserve to be taken into account in plant fibre models.

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“…non-linear stress-strain response) Shah 2013;Wambua et al 2003). Stemming from the latter is another important bottleneck-our inability to accurately model the properties and behaviour of plant fibres (Trivaudey et al 2015) and their composites (Andersons et al 2015;Shah 2016;Summerscales et al 2013;Virk 2010;Virk et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Why do we observe significant differences between measured and ‘back-calculated’ properties of natural fibres?

2016

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The drive towards sustainability, even in materials technologies, has fuelled an increasing interest in bio-based composites. Cellulosic fibres, such as flax and jute, are being considered as alternatives to technical synthetic fibres, such as glass, as reinforcements in fibre reinforced polymer composites for a wide range of applications. A critical bottleneck in the advancement of plant fibre composites (PFRPs) is our current inability to predict PFRP properties from data on fibre properties. This is highly desirable in the cost-and time-effective development and design of optimised PFRP materials with reliable behaviour. This study, alongside limited other studies in literature, have found that the experimentally determined (through single fibre tests) fibre properties are significantly different from the predicted ('backcalculated' using the popular rule-of-mixtures) fibre properties for plant fibres. In this note, we explore potential sources of the observed discrepancy and identify the more likely origins relating to both measurement and errors in predictions based on the rule-of-mixtures. The explored content in this discussion facilitates the design of a future investigation to (1) identify the sensitivity of the discrepancy between measured and predicted fibre properties to the various potential origins, (2) form a unified hypothesis on the observed phenomenon, and (3) determine whether the rule-of-mixtures model (in specific cases) can be improved and may be able to predict properties precisely.

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Nonlinear tensile behaviour of elementary hemp fibres. Part II: Modelling using an anisotropic viscoelastic constitutive law in a material rotating frame

Cited by 31 publications

References 29 publications

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

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

Nonlinear tensile behaviour of elementary hemp fibres: a numerical investigation of the relationships between 3D geometry and tensile behaviour

Why do we observe significant differences between measured and ‘back-calculated’ properties of natural fibres?

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