Journal of Textiles and Polymers

Role of Fabric Structure on the Second Tensile Elastic Modulus of Net Warp-Knitted Fabrics

Vahid Ghorbani; Ali Asghar Asgharian Jeddi; Hadi Dabiryan

Volume 9, Issue 3 , July 2021, , Pages 29-36

http://dx.doi.org/10.48302/jtp.2021.136076

Abstract

   This work aimed to study the second elastic modulus of net warp-knitted fabrics (NWKF) experimentally and theoretically. Net knitted fabrics were selected to study owing to their ...  Read More  This work aimed to study the second elastic modulus of net warp-knitted fabrics (NWKF) experimentally and theoretically. Net knitted fabrics were selected to study owing to their wide practical application and also lack of enough attention. Knitted fabrics have two regions of tensile elastic behavior which the initial one refers to the displacement of the elements of fabrics before jamming of the yarns. As soon as jamming takes place completely, the constituent yarns in the structure of fabrics go through tension. In other words, yarns in their spatial configuration resist the applied loads. This resistance is important in the ultimate strength of the fabrics and also in the composite materials reinforced with knitted fabrics. NWKFs were produced using a Raschel knitting machine. Uniaxial tensile tests were conducted in the course and wale directions. The second elastic modulus was measured using a statistical approach. In the theoretical part, a mechanical model based on the configuration of elements of fabrics after jamming status and using Energy method and Castigliano’s Theorem was proposed. The proposed model was used to calculate the second elastic modulus. To validate the model, the authors’ experimental data along with the collected data from the other researches were compared with the calculated values, and the results showed that the proposed model can predict the modulus reasonably. The results showed that the fabric structure including wale spacing, course spacing, and the number of lapping movements creating the holes affects the second elastic modulus despite the accepted concept, but the mechanical properties of yarns only influence the second elastic modulus of the fabrics. 

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Analyzing the Tensile Behavior of Warp-Knitted Fabric-Reinforced Composites. Part II. Modeling the Tensile Modulus of Composite

Hadi Dabiryan; Ali Asghar Asgharian Jeddi; Mohammad Hossein Ashouri

Volume 7, Issue 1 , January 2019, , Pages 53-60

Abstract

  In the first part of this series, a straight-line geometrical model was generated for Queen’s Cord warpknitted fabrics as reinforcement of the composite. In this part, the Rule ...  Read More In the first part of this series, a straight-line geometrical model was generated for Queen’s Cord warpknitted fabrics as reinforcement of the composite. In this part, the Rule of Mixture (ROM) was modified to calculate the elastic modulus of composites reinforced with Queen’s Cord fabrics using the straight-line model. For this purpose, the geometrical model was divided into different segments, and their angle with the direction of applied force was obtained. Considering the alignment of each segment, the effective length of different segments of the unit-cell of fabrics was calculated. Using the effective length, an orientation coefficient was defined for tensile modulus of fibers in ROM. In order to evaluate the modified ROM, nine types of composites were fabricated using produced Queen’s Cord fabrics. The results showed that modified ROM is closer to experiments than previous modifications.

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Prediction of Relaxed Woven Fabric Geometry Using Energy Method

Hadi Dabirian; Ali Asghar Asgharian Jeddi; Hadi Sharifi

Volume 6, Issue 2 , July 2018, , Pages 107-115

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Damage Detection of Carbon Fiber-reinforced Concrete Under Bending Test

Rooholla Kamani; Mehdi Kamali Dolatabadi; Ali Asghar Asgharian Jeddi; Kourosh Nasrollahzadeh

Volume 6, Issue 1 , January 2018, , Pages 39-45

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Analyzing the Tensile Behavior of Warp-Knitted Fabric Reinforced Composites Part I: Modeling the Geometry of Reinforcement

Hadi Dabiryan; Ali Asghar Asgharian Jeddi

Volume 4, Issue 2 , June 2016, , Pages 68-74

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Estimation on the 3D porosity of plain weft knitted fabric under wale extension

Sahar Abdolmaleki; Ali Asghar Asgharian Jeddi

Volume 2, Issue 2 , June 2014, , Pages 25-31

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Geometrically poisson's ratio of the polyester double-bar warp-knitted structures on the jamming point

Saeed Ajeli; Ali Asghar Asgharian Jeddi

Volume 2, Issue 1 , January 2014, , Pages 26-30

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A novel approach in geometrical-mechanical analysis of plain woven fabrics; Initial load-extension behavior

Mostafa Jamshidi Avanaki; Ali Asghar Asgharian Jeddi; Abbas Rastgoo

Volume 2, Issue 1 , January 2014, , Pages 38-46

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Characterization of fabric tensile loading curve in nonlinear region related to their structure; Part1: woven fabric

Kianoush hosseini; Abdolhosseni Sadeghi; Ali Asghar Asgharian Jeddi

Volume 1, Issue 2 , June 2013, , Pages 53-59

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Investigation of fatigue behavior of polyester filament woven fabrics under cyclic loading

Hooshang Nosraty; Ali Asghar Asgharian Jeddi; Raha Saremi

Volume 1, Issue 1 , January 2013, , Pages 43-52

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