A parametric finite element analysis method for low-density thermally bonded nonwovens

Sabuncuoğlu, Barış; Acar, Memiş; Silberschmidt, Vadim V.

doi:10.1016/j.commatsci.2010.12.005

Cited by 29 publications

(31 citation statements)

References 5 publications

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“…Several studies based on experimental and numerical modelling related to deformation and fracture of nonwovens were performed with some of them focused on micromechanisms involved in these phenomena [11][12][13][14][15][16][17][18][19][20][21][22]. Moreover, most of the work in this area was related not to nonwoven fabrics but to paper [23][24][25][26], which is a very particular type of nonwoven.…”

Section: Introductionmentioning

confidence: 99%

Meso-scale deformation and damage in thermally bonded nonwovens

et al. 2012

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Abstract:Thermal bonding is the fastest and cheapest technique for manufacturing nonwovens. Understanding mechanical behaviour of these materials, especially related to damage, can aid in design of products containing nonwoven parts. A finite-element model incorporating mechanical properties related to damage such as maximum stress and strain at failure of fabric's fibres would be a powerful design and optimization tool. In this study, polypropylene-based thermally bonded nonwovens manufactured at optimal processing conditions were used as a model system. A damage behaviour of the nonwoven fabric is governed by its single-fibre properties, which are obtained by conducting tensile tests over a wide range of strain rates. The fibres for the tests were extracted from the nonwoven fabric in a way that a single bond point was attached at both ends of each fibre. Additionally, similar tests were performed on unprocessed fibres, which form the nonwoven. Those experiments not only provided insight into damage mechanisms of fibres in thermally bonded nonwovens but also demonstrated a significant drop in magnitudes of failure stress and respective strain in fibres due to the bonding process. A novel technique was introduced in this study to develop damage criteria based on the deformation and fracture behaviour of a single fibre in a thermally bonded nonwoven fabric. The damage behaviour of a fibrous network within the thermally bonded fabric was simulated with a finite-element model consisting of a number of fibres attached to two neighbouring bond points. Additionally, various arrangements of fibres' orientation and material properties were implemented in the model to analyse the respective effects.

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Section: Introductionmentioning

confidence: 99%

Meso-scale deformation and damage in thermally bonded nonwovens

et al. 2012

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“…Thus, many efforts were made to develop more realistic models in order to reproduce complex geometries of fibrous materials in FE models. A fibre-deposition method is taken into consideration in some studies, with fibres aligned based on a fibre orientation distribution function obtained from SEM or X-ray images through digital-image processing [30,31,32,33]. Such models can imitate movement and rotation of fibres and bond points enhancing stiffness of a single layer fibrous network [30].…”

Section: Introductionmentioning

confidence: 99%

Assessing stiffness of nanofibres in bacterial cellulose hydrogels: Numerical-experimental framework

Gao

Sozumert

Shi

et al. 2017

Materials Science and Engineering: C

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This work presents a numerical-experimental framework for assessment of stiffness of nanofibres in a fibrous hy-drogel -bacterial cellulose (BC) hydrogel -based on a combination of in-aqua mechanical testing, microstructur-al analysis and finite-element (FE) modelling. Fibrous hydrogels attracted growing interest as potential replacements to some tissues. To assess their applicability, a comprehensive understanding of their mechanical response under relevant conditions is desirable; a lack of such knowledge is mainly due to changes at microscale caused by deformation that are hard to evaluate in-situ because of the dimensions of nanofibres and aqueous en-vironment. So, discontinuous FE simulations could provide a feasible solution; thus, properties of nanofibres could be characterised with a good accuracy. An alternative -direct tests with commercial testing systems -is cumbersome at best. Hence, in this work, a numerical-experimental framework with advantages of convenience and relative easiness in implementation is suggested to determine the stiffness of BC nanofibres. The obtained magnitudes of 53.7-64.9 GPa were assessed by calibrating modelling results with the original experimental data.

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“…Models with periodic symmetric microstructure were presented in [3,4]; these models do not represent the realistic random microstructure of nonwovens. Some recent works introduced the distribution of fibre orientation into the models [5][6][7][8][9][10]. However, they can simulate only the initial deformation stage of nonwoven materials; none of these numerical models can predict the damage behaviour of nonwovens.…”

Section: Introductionmentioning

confidence: 99%

Numerical modelling of damage initiation in low-density thermally bonded nonwovens

Farukh

Demirci

Sabuncuoğlu

et al. 2012

Computational Materials Science

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Due to random orientation of fibres and presence of voids in their microstructure, lowdensity thermally bonded polymer-based nonwovens demonstrate complex processes of deformation and damage initiation and evolution. This paper aims to introduce a micro-scale discontinuous finite element model to simulate an onset of damage in low-density nonwovens. In the model, structural randomness of a nonwoven fabric was introduced in terms of orientation distribution function (ODF) obtained by an algorithm based on the Hough Transform. Fibres were represented in the model with truss elements with orientations defined according to the computed ODF. Another structural element of nonwovens -bond points-were modelled with shell elements having isotropic mechanical properties. The numerical scheme employed direct modelling of fibres at micro level, naturally introducing the presence of voids into the model and thus making it suitable for simulations of low-density nonwovens. The obtained results of FE simulations were compared with our data of tensile tests performed in principal directions until the onset of damage in the specimens.

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A parametric finite element analysis method for low-density thermally bonded nonwovens

Cited by 29 publications

References 5 publications

Meso-scale deformation and damage in thermally bonded nonwovens

Meso-scale deformation and damage in thermally bonded nonwovens

Assessing stiffness of nanofibres in bacterial cellulose hydrogels: Numerical-experimental framework

Numerical modelling of damage initiation in low-density thermally bonded nonwovens

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