Large deformation of thermally bonded random fibrous networks: microstructural changes and damage

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

doi:10.1007/s10853-014-8100-z

Cited by 8 publications

(7 citation statements)

References 23 publications

(32 reference statements)

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“…Nonwovens consisting of larger fibers produced at high throughput would have less bonding points, so fibers have more freedom to move when tensile deformation occurs. It is known that fibers in nonwoven are reoriented to the direction of the load when it undergoes tensile deformation 33 . When there are fewer bonding points, fibers can be reoriented more and absorb more strain before it reaches a failure point.…”

Section: Resultsmentioning

confidence: 99%

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Process‐structure‐property relationship of meltblown poly (styrene–ethylene/butylene–styrene) nonwovens

Yang

Shim

2020

J of Applied Polymer Sci

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With the advance of the thermoplastic plastic elastomer (TPE) technology, there are growing interest and needs for using these materials in the meltblowing process where benefits of small fiber diameters of meltblowns can be combined with rubber‐like elastic properties of elastomers. Performances and utilities of wide ranges of meltblown products such as facemask, medical barrier, wound‐care, diaper can be drastically improved with additions of TPE. In this study, a new elastomeric meltblown fabric was successfully made with the styrene–ethylene/butylene–styrene (SEBS) block copolymer, and the relationship among structure, tensile properties, and meltblowing process parameters are studied. We found that median fiber diameter increases with the polymer mass throughout and decreases with air pressure, and fabric solidity has significantly influenced by die collector distance (DCD). The pore sizes of the fabrics are directly influenced by fiber diameters at the given DCD, but higher DCD increases the pore size due to their open structures. All SEBS nonwovens exhibit high strain at break, larger than 400%. Processing parameters significantly affect tensile properties, and this can be attributed to the fabric structure changes. The reduction of fiber diameter tends to increase the tensile strength of the fabric as it created more fiber‐to‐fiber bond points.

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Section: Resultsmentioning

confidence: 99%

“…It is known that fibers in nonwoven are reoriented to the direction of the load when it undergoes tensile deformation. 33 When there are fewer bonding points, fibers can be reoriented more and absorb more strain before it reaches a failure point.…”

Section: Fabric Tensile Propertiesmentioning

confidence: 99%

Process‐structure‐property relationship of meltblown poly (styrene–ethylene/butylene–styrene) nonwovens

Yang

Shim

2020

J of Applied Polymer Sci

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“…To overcome these shortcomings, a parametric finite-element strategy based on direct introduction of fibres into the model was suggested in Sabuncuoglu et al (2012Sabuncuoglu et al ( , 2013a and further developed by Farukh et al (2012Farukh et al ( , 2013aFarukh et al ( , 2013bFarukh et al ( , 2014. Such a parametric model has the advantage to implement the changes in parameters such as the number and orientation distribution of fibres, size, shape and pattern of bond points easily.…”

Section: Discrete Modelling Techniquementioning

confidence: 99%

Nonwovens modelling: a review of finite-element strategies

Farukh

Demirci

Ali

et al. 2015

The Journal of The Textile Institute

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This paper reviews the main strategies used to simulate the mechanical behaviour of nonwoven materials that is defined by a structure of their fibrous networks and a mechanical behaviour of constituent fibres or filaments. The main parameters influencing the network structure of nonwoven materials are discussed in the first part. The second part deals with two main strategies employed in the analysis of mechanical behaviour of nonwoven materials using finiteelement models based on continuous and discontinuous techniques. Both strategies have further sub-types, which are critically reviewed, and future trends in this area of research are discussed. Key WordsNonwovens, mechanical properties, thermal bonding, finite-element modelling NONWOVENS MODELLING: A REVIEW OF FINITE-ELEMENT STRATEGIES AbstractThis paper reviews the main strategies used to simulate the mechanical behaviour of nonwoven materials that is defined by a structure of their fibrous networks and a mechanical behaviour of constituent fibres or filaments. The main parameters influencing the network structure of nonwoven materials are discussed in the first part. The second part deals with two main strategies employed in the analysis of mechanical behaviour of nonwoven materials using finiteelement models based on continuous and discontinuous techniques. Both strategies have further sub-types, which are critically reviewed, and future trends in this area of research are discussed.

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“…Many mechanical models have been proposed to describe the material behavior of the thermomechanically bonded nonwovens. In the models for nonwovens, the bonds are treated as rigid bodies or as composites whose properties are calculated from bicomponent virgin fiber properties . The rigid body assumption on the bonds leads to inaccurate predictions due to the significant strain experienced by the bonds .…”

Section: Introductionmentioning

confidence: 99%

Effect of areal density and fiber orientation on the deformation of thermomechanical bonds in a nonwoven fabric

Rittenhouse

Wijeratne

Orler

et al. 2018

Polymer Engineering & Sci

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This study proposes a novel method to mechanically characterize the performance of individual bonds in low‐density, thermomechanically bonded nonwoven fabrics. Commercial bicomponent, polyethylene/polypropylene (PE/PP), nonwoven fabric was laser cut into bowtie‐shaped specimens for uniaxial tensile testing so that the central region of each specimen contained an individual bond. Three groups, each composed of 20 specimens, were tested with their longitudinal axes oriented along the machine direction (MD), the cross direction (CD), and at 45° between these two directions (DD). Prior to testing, the intrinsic variation in areal density and fiber orientation in the region surrounding the individual bond were quantified via orientation and relative basis weight parameters. During testing, images of the specimens were acquired to determine the occurrence of fiber breakage, bond deformation, and bond cohesive failure. Maximum force, stiffness, and orientation parameters were found to be significantly different among the three specimen groups (p < 0.01) but the relative basis weight was not (p > 0.01). The stiffness and maximum load were linearly correlated with both the areal density and fiber orientation. Pre‐existing voids or windows within the bond lowered the maximum force for specimens with the longitudinal axes aligned with the MD. These voids had no influence on the maximum force achieved by the specimens aligned with the CD and DD. The bonds in these specimens were observed to deform less than the bonds in the specimens with the longitudinal axes aligned with the MD. The results indicate the importance of the fiber structure surrounding the bond on the tensile properties, deformation and failure mode of individual bonds within the nonwoven fabric. POLYM. ENG. SCI., 59:311–322, 2019. © 2018 Society of Plastics Engineers

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Large deformation of thermally bonded random fibrous networks: microstructural changes and damage

Cited by 8 publications

References 23 publications

Process‐structure‐property relationship of meltblown poly (styrene–ethylene/butylene–styrene) nonwovens

Process‐structure‐property relationship of meltblown poly (styrene–ethylene/butylene–styrene) nonwovens

Nonwovens modelling: a review of finite-element strategies

Effect of areal density and fiber orientation on the deformation of thermomechanical bonds in a nonwoven fabric

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