A minimal continuum representation of a transverse isotropic viscoelastic pulp fibre based on micromechanical measurements
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In: Mechanics of materials, Vol. 135.2019, No. August, 16.05.2019, p. 149-161.
Research output: Contribution to journal › Article › Research › peer-review
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T1 - A minimal continuum representation of a transverse isotropic viscoelastic pulp fibre based on micromechanical measurements
AU - Seidlhofer, Tristan
AU - Czibula, Caterina Marina
AU - Teichert, Christian
AU - Payerl, Claudia
AU - Hirn, Ulrich
AU - Ulz, Manfred
PY - 2019/5/16
Y1 - 2019/5/16
N2 - We propose a minimum input mechanical model of pulp fibres. A pulp fibre can be idealised as a complex compound bar, microfibrils render its behaviour anisotropic. The objective of this work is twofold: (i) develop an anisotropic viscoelastic material model of a pulp fibre that shows the essential characteristics with a minimum number of material parameters and (ii) establish suitable experiments with pulp fibres for obtaining these parameters. The model consists of an additive combination of elastic potentials for an isotropic and an anisotropic part. Viscoelasticity is implemented by a generalised Maxwell model. We suggest an incompressible treatment of the material to relate experiments and material parameters in a well-defined manner. By this means, the calibration of the parameters is performed with only two micromechanical experiments, atomic force microscopy nanoindentation on the fibre's surface and uniaxial tensile tests. We advocate this strategy for certain applications, such as in paper network simulations or fibres in a dry state, when the fibre's compressibility is of minor importance. The results of this analysis show a good performance of the proposed model applied to pulp fibres.
AB - We propose a minimum input mechanical model of pulp fibres. A pulp fibre can be idealised as a complex compound bar, microfibrils render its behaviour anisotropic. The objective of this work is twofold: (i) develop an anisotropic viscoelastic material model of a pulp fibre that shows the essential characteristics with a minimum number of material parameters and (ii) establish suitable experiments with pulp fibres for obtaining these parameters. The model consists of an additive combination of elastic potentials for an isotropic and an anisotropic part. Viscoelasticity is implemented by a generalised Maxwell model. We suggest an incompressible treatment of the material to relate experiments and material parameters in a well-defined manner. By this means, the calibration of the parameters is performed with only two micromechanical experiments, atomic force microscopy nanoindentation on the fibre's surface and uniaxial tensile tests. We advocate this strategy for certain applications, such as in paper network simulations or fibres in a dry state, when the fibre's compressibility is of minor importance. The results of this analysis show a good performance of the proposed model applied to pulp fibres.
UR - http://www.scopus.com/inward/record.url?scp=85066441539&partnerID=8YFLogxK
U2 - 10.1016/j.mechmat.2019.04.012
DO - 10.1016/j.mechmat.2019.04.012
M3 - Article
VL - 135.2019
SP - 149
EP - 161
JO - Mechanics of materials
JF - Mechanics of materials
SN - 0167-6636
IS - August
ER -