Exploring the morphology of flax fibres by X-ray microtomography and the related mechanical response by numerical modelling

E. Richely, A. Bourmaud, H. Dhakal, Zhong Yi Zhang, J. Beaugrand, S. Guessasma*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The external shape and internal lumen of flax fibres are investigated using X-ray microtomography (µ-CT) and finite element (FE) modelling. µ-CT reveals an intricate flax fibre and lumen morphology, with mean porosity contents between 0 and 7.2%. The FE model is based on 3D volumes obtained by X-ray µ-CT and tensile testing in the elastic domain. Numerical results demonstrate the decrease of stiffness as a combined effect of porosity and stress heterogeneity triggered by geometrical considerations. Moreover, stress concentrations induced by both surface roughness and complex lumen shape were observed, highlighting their possible implication in failure mechanisms. However, Young's moduli are overestimated compared to experimental curves and non-linearities are not considered by the rather strong hypothesis of this model (linear elastic material: no viscosity, plasticity or damage mechanisms taken into account). Future work should include the orientation and reorientation of cellulose microfibrils upon tensile testing, as well as damage mechanisms.

Original languageEnglish
Article number107052
Number of pages15
JournalComposites Part A: Applied Science and Manufacturing
Volume160
Early online date24 Jun 2022
DOIs
Publication statusEarly online - 24 Jun 2022

Keywords

  • Finite element analysis
  • Natural fibers
  • Stress concentrations
  • X-ray microtomography

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