Modeling the tensile behaviour of needle punched nonwoven geotextiles

Abstract

Purpose -The purpose of this paper is to propose a theoretical model to predict the mechanical behaviour of needle punched heavy geotextiles in uniaxial tensile test. Design/methodology/approach -The model was constructed using theory of layered composite materials and finite element method. The properties of a reference fabric were used as initial data in theoretical calculations and a commercially available finite element program was chosen to carry out stress analysis. A comparison is made between theoretical calculations and experimental data to evaluate the deformation mechanism of geotextile fabrics in uniaxial tensile test. Findings -The results indicate that compatible data were predicted in terms of stress values and stress distribution of fabrics. The inconstant lateral contraction of nonwoven fabrics in tensile test is also successfully simulated by the model. However, in the case of elongations, the model could not predict the strains of heavy geotextiles accurately. Originality/value -The study aims at predicting the mechanical behaviour of needle punched heavy geotextiles by using the structural and mechanical properties of a "reference fabric" instead of constituent fiber properties.

Optimization of testing parameters for tensile property evaluation of poly(vinyl alcohol) nanofibers webs

“…The optimal experimental curves shown in Figure (b) consists two regions: a near linear increasing portion and the slowly developing phase. A linear elastic behavior in the first region was under a small load, and then the tensile strain–stress curves exhibited a slowly developing phase until break, which is similar with earlier results . The phenomenon could be explained by the two‐step breaking mechanism similar as nonwoven webs .…”

“…A linear elastic behavior in the first region was under a small load, and then the tensile strain–stress curves exhibited a slowly developing phase until break, which is similar with earlier results . The phenomenon could be explained by the two‐step breaking mechanism similar as nonwoven webs . When a small load is applied, the nanofibers in the webs structure tended to align and extend along the stretching direction, resulting in near linear elastic behavior.…”

A brief review on the mechanical behavior of nonwoven fabrics

“…An analytical method was proposed to predict stiffness parameters of heavy nonwoven geotextiles using layer theory and uniaxial loading conditions. 21 The results of that study was compared with FEA and it was revealed similar stresses in identical fabrics. Later, the effects of manufacturing parameters on the tensile stiffnesses for thermally bonded nonwoven structures was studied by utilizing an efficient and novel numerical method based on finite element analysis.…”

Prediction of deformation behavior of single jersey cotton knitted fabrics using finite element method

“…The tensile behavior of non-woven fabrics was theoretically predicted by using orthotropic and non-linear finite elements. Comparison made between the theoretical calculations and experimental data with various stress values and strain distributions (Erdogan and Erdem, 2011).…”