Mechanical behaviour of nonwovens: Analysis of effect of manufacturing parameters with parametric computational model

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

doi:10.1016/j.commatsci.2013.12.040

Cited by 22 publications

(13 citation statements)

References 14 publications

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“…The details of calculation of the number of fibres are given in [15,22]. The process of generation of the model with bond points connected by the fibres between them according to their orientation distribution was performed with a subroutine written in Patran Command Language (PCL).…”

Section: Discrete Phase Modelmentioning

confidence: 99%

Mechanical analysis of bi-component-fibre nonwovens: Finite-element strategy

Farukh

Demirci

Sabuncuoğlu

et al. 2015

Composites Part B: Engineering

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a b s t r a c tIn thermally bonded bi-component fibre nonwovens, a significant contribution is made by bond points in defining their mechanical behaviour formed as a result of their manufacture. Bond points are composite regions with a sheath material reinforced by a network of fibres' cores. These composite regions are connected by bi-component fibres -a discontinuous domain of the material. Microstructural and mechanical characterization of this material was carried out with experimental and numerical modelling techniques. Two numerical modelling strategies were implemented: (i) traditional finite element (FE) and (ii) a new parametric discrete phase FE model to elucidate the mechanical behaviour and underlying mechanisms involved in deformation of these materials. In FE models the studied nonwoven material was treated as an assembly of two regions having distinct microstructure and mechanical properties: fibre matrix and bond points. The former is composed of randomly oriented core/sheath fibres acting as load-transfer link between composite bond points. Randomness of material's microstructure was introduced in terms of orientation distribution function (ODF). The ODF was obtained by analysing the data acquired with scanning electron microscopy (SEM) and X-ray micro computed tomography (CT). Bond points were treated as a deformable two-phase composite. An in-house algorithm was used to calculate anisotropic material properties of composite bond points based on properties of constituent fibres and manufacturing parameters such as the planar density, core/sheath ratio and fibre diameter. Individual fibres connecting the composite bond points were modelled in the discrete phase model directly according to their orientation distribution. The developed models were validated by comparing numerical results with experimental tensile test data, demonstrating that the proposed approach is highly suitable for prediction of complex deformation mechanisms, mechanical performance and structure-properties relationships of composites.

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Section: Discrete Phase Modelmentioning

confidence: 99%

Mechanical analysis of bi-component-fibre nonwovens: Finite-element strategy

Farukh

Demirci

Sabuncuoğlu

et al. 2015

Composites Part B: Engineering

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“…The character of distribution of constituent fibres in nonwoven materials depends on the type of the manufacturing process; the non-uniformity of their orientational distribution defines an anisotropy of their mechanical behaviour. For instance, thermally bonded calendered nonwoven webs exhibit very low stiffness in CD and TD compared to that in MD [5][6][7] since fibres are preferentially aligned along the machine direction. To characterise the random fibre orientation, a distribution function was introduced by Cox in 1952 [8].…”

Section: Introductionmentioning

confidence: 99%

Deformation and damage of random fibrous networks

Sozumert

Farukh

Sabuncuoğlu

et al. 2020

International Journal of Solids and Structures

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1 HIGHLIGHTS  Damage and fracture mechanisms of fibrous networks are investigated.  A combined experimental and numerical (finite-element) study is implemented. Effects of notch shape on deformation localization and damage evolution are studied. A notch in fibrous networks does not cause a significant increase in localized strain. AbstractFibrous networks are encountered in various natural and synthetic materials. Typically, they have random microstructures with complex patterns of fibre distribution. This microstructure, together with significant (in many cases) stretchability of such networks, results in a nontrivial load-transfer mechanism, different from that of continuous media. The aim of this study is to investigate evolution of local deformation, damage and fracture processes in fibrous networks. In order to do this, together with extensive experiments, discontinuous finiteelement (FE) models with direct incorporation of microstructural features were developed using a parametric approach for specimens with various dimensions and different types of notches. These models, mimicking a microstructure of the selected fibrous network, were loaded by stretching along a principal direction. Discontinuous FE models provided data not only on a global response of the specimens but also on levels of stresses and strains in each fibre, forming the network. An effect of a notch shape on evolution of fibre strains as well as mechanisms and patterns of damage was investigated using experimental data and simulation results, assessing also toughness of specimens. Strain distribution over selected paths were tracked in notched specimens to quantify strain distributions in the vicinity of notch tips. The growth and patterns of local damage due to axial stretching obtained in advanced numerical 1 Corresponding author (Vadim V. Silberschmidt): Wolfson School of Mechanical, Electrical and Manufacturing Engineering3 simulations with the developed FE models demonstrated a good agreement with experimental observations.

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“…However, the ones elaborated from nonwoven based fabrics outperform unidirectional and multiaxial PFRPs in terms of property per unit cost. If all these studies mainly deal with the tensile mechanical behaviour of composites manufactured from nonwoven reinforcements, the identification of the mechanical properties of dried nonwoven preform has not been widely studied [14]. Experimental analysis conducted by Farukh et al [14,15] showed significant tensile strain abilities in the 50% range.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the deformability of flax-fibre nonwoven fabrics during manufacturing

Omrani

Wang

Soulat

et al. 2017

Composites Part B: Engineering

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The use of natural fibres for technical advanced products such as composites is widely increasing with the view to reduce the impact of the material throughout its life cycle on the environment. Some work has been performed on natural fibre based reinforcement textiles for composite materials. The mechanical and the formability behaviours of woven fabrics has particularly been characterised. However, few research work concerns the forming aptitude of nonwoven fabrics despite promising preliminary studies. In the present work, the mechanical characterizations of flax-fibre nonwoven reinforcements are carried out firstly. Then the forming tests of the nonwoven fabrics are performed to quantify their formability behaviour. The tensile and forming tests showed very different mechanical behaviours in comparison to the ones observed on woven fabrics due to the non-uniformity of nonwoven fabric. The high deformation potential of the nonwoven fabrics is established. The specific behaviour of the nonwoven fabrics is studied by analysing the local and global deformation mechanisms of the reinforcement during forming. Moreover, the manufacturing defects experienced in nonwoven fabric forming are demonstrated. The slippage/damage of network is a typical problem in the nonwoven fabric forming, which depends strongly on the fibre density (area density) of fabric and blank-holder pressure.

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Mechanical behaviour of nonwovens: Analysis of effect of manufacturing parameters with parametric computational model

Cited by 22 publications

References 14 publications

Mechanical analysis of bi-component-fibre nonwovens: Finite-element strategy

Mechanical analysis of bi-component-fibre nonwovens: Finite-element strategy

Deformation and damage of random fibrous networks

Analysis of the deformability of flax-fibre nonwoven fabrics during manufacturing

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