Predicting the Biaxial Tensile Deformation Behavior of Spunbonded Nonwovens

Bais-Singh, Smita; Goswami, Bhuvenesh C.

doi:10.1177/004051759806800310

Cited by 17 publications

(6 citation statements)

References 11 publications

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“…The finite element model is able to successfully predict Poisson's ratios as high as 1.3 in a uniaxial test. Although still lower than the experimental values obtained in a uniaxial test, these values are much higher than the experimental values obtained by biaxial testing [ 5 ] . The main reason for such high values of Poisson's s ratio in uniaxial testing lies in the easy buckling of fibers under compression as well as the directional dependence of fabric stiffness.…”

Section: Resultscontrasting

confidence: 74%

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Finite Element Modeling of the Nonuniform Deformation of Spun-Bonded Nonwovens

Bais-Singh

Biggers

Goswami

1998

Textile Research Journal

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Deformation of a spunbonded nonwoven fabric specimen is extremely nonuniform during a uniaxial tensile test. Complex stress/strain fields are generated in the specimen due to the effect of the jaws, the nonlinear nature of deformation, and the low shear stiffness of the fabric, causing "necking" to take place in the unrestricted region. A finite element model is presented to model the nonuniform deformation of the fabric. Nonuniform stress/strain fields developing in the fabric during a uniaxial test are modeled for the first time. Data from representative tests are reported for comparison to the results. obtained with the model. The model correctly predicts the variation of Poisson's ratio with longitudinal strains. Unlike previous studies, correct boundary conditions and force equilibrium conditions are incorporated in the model. The important effects of fiber buckling and material nonlinearity are discussed.Uniaxial tensile testing is the most commonly used method for characterizing the tensile deformation of a nonwoven fabric. In current practice, a state of uniform stress and strain is assumed in the entire fabric in order to interpret the data from such experiments. For a linear isotropic material, the elffect of the end constraints is expected to vanish away from the jaws. However, in complex fibrous structures such as some nonwovens, unlike the linear elastic materials, deformation is extremely nonuniform. In such structures, for example, the lateral contraction of the specimen does not become constant at some distance away from the jaws, but increases gradually towards the center of the specimen, forming a &dquo;neck.&dquo; The nonlinear stress-strain behavior of the constituent fibers, the significant shear effects existing in a conventional uniaxial test, and the extremely low stiffness of the fabrics under compressive strains are some factors believed to be responsible for this behavior. In this paper, we take all these factors into account to correctly model nonuniform deformation of a fabric. We present analytical and experimental evidence to demonstrate that the stress and strain fields developing in a nonwoven. specimen are not uniform, and we formulate a finite element model to simulate the nonuniform development of stresses and strains in a fabric.

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Section: Resultscontrasting

confidence: 74%

“…The orientation distribution function and fiber stressstrain behavior were used as input parameters. A detailed procedure for obtaining these parameters has been reported in previous publications [ 4,5 ] . For the 9.0 dpf PET fiber used in fabrics A and C, the bilinear fit constants were K, ,T 225.3974, K, = 17.3745, Kz = 5.6290, and c,.…”

Section: Methodsmentioning

confidence: 99%

Finite Element Modeling of the Nonuniform Deformation of Spun-Bonded Nonwovens

Bais-Singh

Biggers

Goswami

1998

Textile Research Journal

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“…It was concluded that the results generated from the analytical theory accurately matched the data from experimental studies. Later, their previous work was extended in 18 by utilizing the same unit cell (see Figure 1) under biaxial tensile loading. It was shown that, stress predictions for the longitudinal direction were consistent with the experimental results.…”

Section: Tensile Behaviormentioning

confidence: 99%

A brief review on the mechanical behavior of nonwoven fabrics

Yilmaz

Sabuncuoğlu

Yıldırım

et al. 2020

Journal of Engineered Fibers and Fabrics

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Although nonwovens used in many areas from civil and mechanical engineering to consumer products, research on their mechanical behavior are rather limited in the literature. In this study, a brief overview is presented on the previous research performed to understand the relation between the microstructure and the mechanical behavior of these materials. The research studies are categorized into five sections declining with tensile, creep, bending, dynamic and damage behavior. For each type of behavior, previous research is discussed briefly following by that of the last few years. The review demonstrates that the tensile behavior is understood well whereas there is a limited number of studies in bending and dynamic behavior of nonwoven materials. Future research is expected to be more related on the in-service behavior.

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“…BASIC EQUATIONS ' j ' BASIC' EQUATIONS j Letting [K] be the stiffness matrix of the structure, {D} the nodal degree(s) of freedom (dof) of the structure, and ( R ) the total load on the structure nodes, the toaddisplacement equation of a static geometric nonlinear problem can be stated as 1 In this section, we outline the change of variables in the triple integral and the derivation of the strain-displacement matrix [B]. The details can be found in earlier work [ 16].…”

Section: Finite Element Displacement Formulationmentioning

confidence: 99%

Deformation Analysis of 3D Braided Structural Composites

Tang

Postle

2003

Textile Research Journal

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A nonlinear finite element technique is used to simulate and analyze the deformation behavior of 3D braided composites. The finite element displacement formula is derived from the geometric nonlinear behavior of braided composites. The integral relevant to the element stiffness matrix is simplified by selecting a 20-node hexahedral solid element. The Gauss-Legendre quadrature is used to compute the element matrix. A program referred to as SNLFEDA (Simulation of Nonlinear Finite Element Deformation Analysis) is developed. Tension, compression, and bending of 3D braided composites is simulated, and the results' of these simulations are supported by the experimental data and the values predicted by previously published elastic modulus models.The properties of composite materials determine their areas of application, so it is necessary to analyze and predict deformation properties and physical behavior by simulation before designing and producing these composites. Textile structural composites have a very important position in the composite family. Many models of 3D woven [2, 4. 7], nonwoven [ 1 ], and knitted [8, 12J composites as well as 2D braided composites [4, 131 have been developed. However, little work [9, 10] on the deformation analysis of 3D braided composites has been reported in the literature.In this paper, we will focus on the deformation analysis of 3D braided structural composites. After establishing a relationship between the strain-displacement matrix of finite element analysis and the key parameters of 3D braided structural composites, we develop a program referred to as SNLFEDA (Simulation of Nonlinear Finite Element Deformation Analysis) with 20-node hexahedral elements and 3 X 3 X 3 Gauss-Legendre quadrature. followed by simulations of tension, compression, and bending using this program. Finally, we analyze and discuss the deformation of 3D braided composites.

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Predicting the Biaxial Tensile Deformation Behavior of Spunbonded Nonwovens

Cited by 17 publications

References 11 publications

Finite Element Modeling of the Nonuniform Deformation of Spun-Bonded Nonwovens

Finite Element Modeling of the Nonuniform Deformation of Spun-Bonded Nonwovens

A brief review on the mechanical behavior of nonwoven fabrics

Deformation Analysis of 3D Braided Structural Composites

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