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Computational Design of Fibre Network by Discrete Element Method
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
2017 (English)In: Advancedin Pulp and Paper Research, Proceedings of the 16th Fundamental Research Symposium (Peer-reviewed), Oxford, UK, September 3rd-8th,2017, 2017Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
2017.
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:miun:diva-33316OAI: oai:DiVA.org:miun-33316DiVA, id: diva2:1191731
Conference
The 16th Pulp and Paper Fundamental Research Symposium, Oxford, UK, 3-8 September 2017
Available from: 2018-03-20 Created: 2018-03-20 Last updated: 2018-12-11Bibliographically approved
In thesis
1. Modelling Mechanics of Fibre Network using Discrete Element Method
Open this publication in new window or tab >>Modelling Mechanics of Fibre Network using Discrete Element Method
2018 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Low-density fibre networks are a fundamental structural framework of everyday hygiene products, such as baby diapers, incontinence and feminine care products, bathroom tissue and kitchen towels. These networks are a random assembly of fibres, loosely bonded and oriented in the plane direction.

Designing such a complex network structure for better performance, better use of materials and lower cost is a constant challenge for product designers, requiring in-depth knowledge and understanding of the structure and properties on the particle (fibre) level.

This thesis concerns the development of a computational design platform that will generate low-density fibre networks and test their properties, seamlessly, with the aim to deepening the fundamental understanding of the micromechanics of this class of fibre networks.

To achieve this goal, we have used a particle-based method, the Discrete Element Method (DEM), to model the fibres and fibre networks. A fibre is modelled as a series of linked beads, so that one can consider both its axial properties (stretching and bending) and transverse properties (shearing,twisting and transverse compression). For manufacturing simulations, we developed the models for depositing fibres to form a fibre network, consolidating the fibre network, compressing to make a 3D-structured network, and creating creping. For testing the end-use performance, we have developed two models and investigated the micromechanics of the fibre network in uniaxial compression in the thickness direction (ZD) and in uniaxial tension in the in-plane direction.

In the ZD-uniaxial compression of entangled (unbonded) fibrenetworks, the compression stress exhibits a power-law relationship with density, with a threshold density. During compression, the fibre deformation mode changed from fibre bending to the transverse compression of fibre. Accordingly, the transverse properties of the fibreshad a large impact on the constitutive relation. By considering a realistic value for the transverse fibre property, we were able to predict the valuesof the exponent widely observed in the experimental literature. We havefound that the deviation of the experimental values from those predictions by the earlier theoretical studies is due to the neglect of the transverse fibre property.

For tensile properties of bonded networks, we have investigated scaling of network strength with density and fibre–fibre bond strength. The network strength showed beautiful scaling behaviour with both density and bond strength, with exponents 1.88 and 1.08 respectively. The elastic modulus of the network, on the other hand, showed a changing exponent(from 2.16 to 1.69) with density in accordance with previous results in the literature. We have also reconfirmed that, with increasing density, the deformation mode changes from bending to stretching. The predicted results for both elastic modulus and strength agreed very well with experimental data of fibre networks of varying densities reported in the literature.

We have developed a computational platform, based on DEM, for accurately modelling a fibre network from its manufacturing process to product properties. This is a tool that allows a versatile design of materials and products used for hygiene products, providing a promising venue for exploring the parameter space of new material and process design.

Place, publisher, year, edition, pages
Sundsvall: Mid Sweden University, 2018. p. 30
Series
Mid Sweden University licentiate thesis, ISSN 1652-8948 ; 144
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-34640 (URN)978-91-88527-64-6 (ISBN)
Presentation
2018-10-24, O111, Sundsvall, 13:00 (English)
Supervisors
Note

Vid tidpunkten för framläggningen av avhandlingen var följande delarbeten opublicerade: delarbete 2 och 3 (manuskript).

At the time of the defence the following papers were unpublished: paper 2 and 3 (manuscript).

Available from: 2018-10-05 Created: 2018-10-05 Last updated: 2018-10-05Bibliographically approved

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Hossain, ShakhawathBergström, Per

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