2D finite element analysis of thermally bonded nonwoven materials: Continuous and discontinuous models

Hou, Xiaonan; Acar, Memiş; Silberschmidt, Vadim V.

doi:10.1016/j.commatsci.2009.07.007

Cited by 47 publications

(31 citation statements)

References 18 publications

(19 reference statements)

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“…The local stiff region in the lattice model can be regarded as a hard particle or region inside a fibrous material. An example can for instance be the locally thermally bonded material investigated by Hou et al (2009) or an electronic textile with a light-emitting-diode mounted on it .…”

Section: Problem Statementmentioning

confidence: 99%

A multiscale quasicontinuum method for dissipative lattice models and discrete networks

Beex¹,

Peerlings²,

Geers³

2014

Journal of the Mechanics and Physics of Solids

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Lattice models and discrete networks naturally describe mechanical phenomena at the mesoscale of fibrous materials. A disadvantage of lattice models is their computational cost. The quasicontinuum (QC) method is a suitable multiscale approach that reduces the computational cost of lattice models and allows the incorporation of local lattice defects in large-scale problems. So far, all QC methods are formulated for conservative (mostly atomistic) lattice models. Lattice models of fibrous materials however, often require non-conservative interactions. In this article, a QC formulation is derived based on the virtual-power of a non-conservative lattice model. By using the virtual-power statement instead of force-equilibrium, errors in the governing equations of the force-based QC formulations are avoided. Nevertheless, the non-conservative interaction forces can still be directly inserted in the virtualpower QC framework. The summation rules for energy-based QC methods can still be used in the proposed framework as shown by two multiscale examples.

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Section: Problem Statementmentioning

confidence: 99%

A multiscale quasicontinuum method for dissipative lattice models and discrete networks

Beex¹,

Peerlings²,

Geers³

2014

Journal of the Mechanics and Physics of Solids

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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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“…Its discontinuous fibre arrangement consists of fibres having a length between 20 and 30 mm. More details on dimensions of its pattern of bond points are given in [4].…”

Section: Modelled Materialsmentioning

confidence: 99%

“…It is also difficult to develop the model for nonlinear material behaviour such as creep and implementation of damage. In the previous works by Mueller and Kochmann [2] and Limem and Warner [3] and Hou et al [4], orthotropic structure is implemented by modelling the fibres with truss elements leaving only bond points as shell structure. That kind of modelling is appropriate for low density nonwovens as individual fibres are modelled directly and the behaviour should not account for the presence of the voids since they are introduced explicitly.…”

Section: Introductionmentioning

confidence: 99%

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

Sabuncuoğlu

Acar

Silberschmidt

2012

Computational Materials Science

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In this study, a new method for the finite element analysis of low-density thermally bonded nonwoven materials is proposed and compared with tensile tests. By using advantages of parametric modelling, the model with a large number of fibres is developed. It has also the advantage to implement easily any changes in its parameters such as dimensions and material properties easily. In the suggested model, bond points in a nonwoven are connected by fibres according to criteria in the input file to prevent cross-ing over bond points and unrealistic long-distance connections. Orientation distribution of fibres is deter-mined by an image analysis technique based on the Hough transform and implemented into the model with the variation of crosssectional areas of fibres. Creep tests are performed with single fibres to deter-mine a time-dependent response under constant load due to their visco-elastic behaviour. A case of uni-form tension is simulated with various elastic, elasto-plastic and creep material properties. The results for various formulations are compared with each other as well as with the data from tensile tests. The obtained results are discussed and suggestions for further development of the model are presented.

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2D finite element analysis of thermally bonded nonwoven materials: Continuous and discontinuous models

Cited by 47 publications

References 18 publications

A multiscale quasicontinuum method for dissipative lattice models and discrete networks

A multiscale quasicontinuum method for dissipative lattice models and discrete networks

Meso-scale deformation and damage in thermally bonded nonwovens

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

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