Tensile behaviour of natural fibres. Effect of loading rate, temperature and humidity on the “accommodation” phenomena

Placet, Vincent

doi:10.1051/epjconf/20100620001

Cited by 4 publications

(2 citation statements)

References 11 publications

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“…4.b. This degree of stiffening is consistent with the experimental results obtained by the present authors with Repeated Progressive Loading (29,30), and is of the same order as that observed by Baley (6) and Silva (31), with flax and sisal fibres, respectively.…”

Section: Cellulose Microfibril Reorientation (Mfr)supporting

confidence: 93%

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

Trivaudey

Placet

Guicheret-Retel

et al. 2015

Composites Part A: Applied Science and Manufacturing

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A 3D viscoelastic model is presented, based on the use of finite element method for the study of the nonlinear tensile behaviour of hemp fibres. On the basis of an experimental investigation, Part I of this study (Placet, Cisse and Boubakar, Composites Part A 56:319-327, 2014) proposed a scenario based on several physical mechanisms, in order to explain the nonlinear behaviour of such fibres. These mechanisms included viscoelastic strain, cellulose microfibril reorientation, and shear strain-induced crystallisation of the amorphous paracrystalline components. The second part of this ongoing study proposes to implement such mechanisms and the associated constitutive laws in a simplified 3D model, in order to evaluate the contribution of each mechanism to the macroscopic tensile behaviour of the fibre. The results show that the proposed anisotropic viscoelastic constitutive law, describing finite transformations through a material rotating frame formulation, is able to accurately simulate the shape of the experimentally observed tensile curves. This model is also used to investigate the influence of dislocation areas on the tensile behaviour and stress fields.

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Section: Cellulose Microfibril Reorientation (Mfr)supporting

confidence: 93%

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

Trivaudey

Placet

Guicheret-Retel

et al. 2015

Composites Part A: Applied Science and Manufacturing

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“…6b shows that, below the yield point, the apparent Young's modulus increases by approximately 8% after 10 cycles at the same loading level. This stiffening phenomenon resulting from repeated low loading levels has been widely studied [25,26]; we showed that the rigidity increases by as much as 60% after a few thousand cycles, and tends to stabilize even when a higher number of cycles is applied. In this study, we show that when the yield point is exceeded, the fibre stiffness can be increased by almost 20% in a single cycle.…”

Section: Resultsmentioning

confidence: 71%

Nonlinear tensile behaviour of elementary hemp fibres. Part I: Investigation of the possible origins using repeated progressive loading with in situ microscopic observations

Placet

Cissé

Boubakar

2014

Composites Part A: Applied Science and Manufacturing

105

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The aim of this study is to achieve a better understanding of the nonlinear tensile behaviour of the elementary hemp fibre. This is of great importance in view of the need to develop an efficient predictive tool for the design of natural fibre reinforced composites. This first paper investigates the possible mechanisms responsible for the nonlinear behaviour, using repeated progressive tensile loading with in situ polarised light microscopy. The persistence of residual strain has been confirmed during testing when the tensile load was released. Only a certain fraction of this residual strain is reversible, and the reversibility is time-dependent. Beyond the yield level, the fibre's rigidity is not deteriorated, but significantly increased as a function of the number of loading cycles and the level of strain. A new scenario involving a stick-slip mechanism, extension and reorientation of the microfibrils and shear strain-induced crystallisation of the amorphous cellulose is proposed.

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Influence of environmental relative humidity on the tensile and rotational behaviour of hemp fibres

2011

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Tensile behaviour of natural fibres. Effect of loading rate, temperature and humidity on the “accommodation” phenomena

Cited by 4 publications

References 11 publications

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

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

Nonlinear tensile behaviour of elementary hemp fibres. Part I: Investigation of the possible origins using repeated progressive loading with in situ microscopic observations

Influence of environmental relative humidity on the tensile and rotational behaviour of hemp fibres

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