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

Farukh, Farukh; Demirci, Emrah; Sabuncuoğlu, Barış; Acar, Memiş; Pourdeyhimi, Behnam; Silberschmidt, Vadim V.

doi:10.1016/j.commatsci.2012.05.038

Cited by 29 publications

(27 citation statements)

References 9 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%

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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%

“…5); the complete details of specimen preparation are given in [20]. Photrom Fastcam SA3 was also used to make sure that the tested fibre was not stretched during the mounting of specimen.…”

Section: Single-fibre Specimenmentioning

confidence: 99%

Meso-scale deformation and damage in thermally bonded nonwovens

et al. 2012

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“…Kästner et al [22] performed uniaxial tensile, relaxation and cyclic experiments to quantify parameters of inelastic behaviour of polypropylene that were subsequently used to formulate constituent equations for implementation in numerical modelling. A parametric numerical code was developed to model fibrous networks [23] based on their realistic microstructure and several models were implemented employing this code, incorporating elastic, plastic and viscous properties of constituent fibres obtained from tests [24][25][26]. The randomness of the microstructure was introduced into the models in terms of the orientation distribution function (ODF) for fibres.…”

Section: Introductionmentioning

confidence: 99%

Inelastic behaviour of bacterial cellulose hydrogel: In aqua cyclic tests

et al. 2015

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Citation: GAO, X. et al., 2015. Inelastic behaviour of bacterial cellulose hydrogel: in aqua cyclic tests. Polymer Testing, 44, Additional Information:• This paper was accepted for publication in the journal Poly- AbstractHydrogels are finding an increasingly broad use, especially in biomedical applications. Their complex structure -a low-density network of microfibrils -defines their non-trivial mechanical behaviour. The focus of this work is on test-based quantification of mechanical behaviour of a bacterial cellulose (BC) hydrogel exposed to cyclic loading. Specimens for the tests were produced using Gluconacetobacter xylinus ATCC 53582 and tested in aqua under uniaxial cyclic loading conditions in a displacement-controlled regime. Substantial microstructural changes were observed in the process of deformation. A combination of qualitative microstructural observations with quantitative force-displacement relations allowed identification of main deformation mechanisms, confirming inelastic behaviour of BC hydrogel under a loading-unloading-reloading regime. Elastic deformation was accompanied by non-elastic (viscoplastic) deformation in both tension and compression. This study also aims to establish a background for micromechanical modelling of overall properties of BC hydrogels.

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

Cited by 29 publications

References 9 publications

Meso-scale deformation and damage in thermally bonded nonwovens

Meso-scale deformation and damage in thermally bonded nonwovens

Inelastic behaviour of bacterial cellulose hydrogel: In aqua cyclic tests

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

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