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Creep behaviour of single hemp fibres. Part I: viscoelastic properties and their scattering under constant climate

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Abstract

The literature on the time-dependent behaviour of single bast fibres such as flax and hemp is extremely poor. The aim of this extensive study is to characterise the long-term behaviour of elementary hemp fibres and to establish suitable constitutive laws. Single hemp fibres are shown to exhibit both instantaneous strain and delayed, time-dependent strain when tensile loaded under constant climate. The creep behaviour appears to be a logarithmic function of time with a high strain rate during the primary creep and a lower and constant one during the secondary creep. A large scattering both in time-dependent properties and behaviour was observed on a batch of 25 single fibres. Three main creep behaviours were observed. Type II is truly linear as a function of the logarithm of time while Type I and Type III are strongly nonlinear and can be described, respectively, by concave and convex functions. A rheological model based on an anisotropic viscoelastic law and on a truncated inverse Gaussian spectrum of viscous mechanisms was shown to successfully describe all the experimentally observed behaviours.

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Acknowledgements

The authors would like to thank Camille Garcin and Jean-Marc Côte from the FEMTO-ST Institute for their assistance with some of the experiments.

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Authors and Affiliations

  1. Department of Applied Mechanics, FEMTO-ST Institute, UMR CNRS 6174, University of Franche-Comté, 25000, Besançon, France

    Ousseynou Cisse, Vincent Placet, Violaine Guicheret-Retel, Frédérique Trivaudey & M. Lamine Boubakar

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  1. Ousseynou Cisse
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  2. Vincent Placet
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  3. Violaine Guicheret-Retel
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  4. Frédérique Trivaudey
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  5. M. Lamine Boubakar
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Correspondence to Vincent Placet.

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Cisse, O., Placet, V., Guicheret-Retel, V. et al. Creep behaviour of single hemp fibres. Part I: viscoelastic properties and their scattering under constant climate. J Mater Sci 50, 1996–2006 (2015). https://doi.org/10.1007/s10853-014-8767-1

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  • DOI: https://doi.org/10.1007/s10853-014-8767-1

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