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Published in: Cellulose 15/2021

17-08-2021 | Original Research

On the role of fibre bonds on the elasticity of low-density papers: a micro-mechanical approach

Authors: L. Orgéas, P. J. J. Dumont, F. Martoïa, C. Marulier, S. Le Corre, D. Caillerie

Published in: Cellulose | Issue 15/2021

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Abstract

Fine prediction of the elastic properties of paper materials can now be obtained using sophisticated fibre scale numerical approaches. However, there is still a need, in particular for low-density papers, for simple and compact analytical models that enable the elastic properties of these papers to be estimated from the knowledge of various structural information about their fibres and their fibrous networks. For that purpose, we pursued the analysis carried out in Marulier et al. (Cellulose 22:1517–1539, 2015. https://​doi.​org/​10.​1007/​s10570-015-0610-6) with low-density papers that were fabricated with planar random and orientated fibrous microstructures and different fibre contents. The fibrous microstructures of these papers were imaged using X-ray synchrotron microtomography. The corresponding 3D images revealed highly connected fibrous networks with small fibre bond areas. Furthermore, the evolutions of their Young’s moduli were non-linear and evolved as power-laws with the fibre content. Current analytical models of the literature do not capture these trends. In light of these experimental data, we developed a fibre network model for the in-plane elasticity of papers in which the main deformation mechanisms of the micromechanical model is the shear of the numerous fibre bonds and their vicinity, whereas the fibre parts far from these zones were considered as rigid bodies. The stiffness tensor of papers was then estimated both numerically using a discrete element code and analytically using additional assumptions. Both approaches nicely fit the experimental trends by adjusting a unique unknown micromechanical parameter, which is the shear stiffness of bonding zones. The estimate of this parameter is relevant in light of several recently reported experimental results.

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Appendix
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Metadata
Title
On the role of fibre bonds on the elasticity of low-density papers: a micro-mechanical approach
Authors
L. Orgéas
P. J. J. Dumont
F. Martoïa
C. Marulier
S. Le Corre
D. Caillerie
Publication date
17-08-2021
Publisher
Springer Netherlands
Published in
Cellulose / Issue 15/2021
Print ISSN: 0969-0239
Electronic ISSN: 1572-882X
DOI
https://doi.org/10.1007/s10570-021-04098-w

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