Mesoscale model for elastic modulus of warp-knitted fabric-reinforced composites based on spring model

2019 ◽  
Vol 50 (1) ◽  
pp. 46-69
Author(s):  
Hadi Dabiryan ◽  
Mohammad H Ashouri
Keyword(s):  
Elastic Modulus ◽  
Mesoscale Model ◽  
Tensile Modulus ◽  
Theoretical Data ◽  
Tensile Tests ◽  
Geometrical Model ◽  
Knitted Fabric ◽  
Reinforced Composites ◽  
Spring Model ◽  
Warp Knitted Fabric

In this paper, a ‘mesoscale spring model’ was generated to predict the tensile modulus of warp-knitted fabric-reinforced composites. A previously developed geometrical model was used for generating a mechanical model as a set of series and parallel springs. For this purpose, the unit cell of straight line model was discretized into different segments. Each segment was modelled as a spring with definite constant based on the alignment of yarns in the segment. Warp-knitted fabrics (Queen's Cord) were used as reinforcement of composites. In order to validate the presented model, samples of composites were produced using hand layup method. Tensile tests were carried out on the prepared samples. The comparison between theoretical and experimental elastic modulus showed a reasonable agreement between experimental and theoretical data. Also, the comparison between the results of different models and experimental data showed that the results of spring model are closer to the experimental results than that of Krenchel's model. It can be concluded that the spring model can predict adequately the elastic modulus of composites.

Tensile Properties on Single-Bar Modified Tricot Fabric Reinforced Composites

2012 ◽  
Vol 535-537 ◽  
pp. 223-226 ◽  
Author(s):  
Xiao Hong Ma ◽  
Zhi Gang Qin
Keyword(s):  
Elastic Modulus ◽  
Tensile Properties ◽  
Unsaturated Polyester ◽  
Testing Machine ◽  
Tensile Load ◽  
Knitted Fabric ◽  
Reinforced Composites ◽  
Stress Strain ◽  
Universal Material Testing Machine ◽  
Warp Knitted Fabric

Four kinds of single-bar modified tricot fabrics are knitted on a Raschel latch needle warp knitting machine with glass continuous-filament yarns. The glass warp knitted fabric/ unsaturated polyester resin composites are produced by manual molding technology. The tensile properties of composite samples are tested on the universal material testing machine. The stress-strain curves, elastic modulus, fracture strengths of composites are analyzed in the course, wale and diagonal directions. The results show that the tensile stress/strain curves of single-bar modified tricot warp knitted fabric reinforced composites were nonlinear. The tensile properties of composites possess obvious anisotropic characteristics. The values of elastic modulus and tensile strength were in relation to the yarn numbers bearing tensile load in tensile directions

Mechanical Properties of Warp-Knitted, Fabric-Reinforced Composites

1993 ◽  
Vol 12 (10) ◽  
pp. 1096-1110 ◽  
Author(s):  
Wei-Liang Wu ◽  
Masaya Kotaki ◽  
Akihiro Fujita ◽  
Hiroyuki Hamada ◽  
Miyako Inoda ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Knitted Fabric ◽  
Reinforced Composites ◽  
Warp Knitted Fabric

Environmental Corrosion Resistance of Textile Reinforced Composites in Seawater

2015 ◽  
Vol 813 ◽  
pp. 140-146
Author(s):  
Ning Ning Wang ◽  
Jia Ying Sun ◽  
Cheng Yan Zhu
Keyword(s):  
Corrosion Resistance ◽  
Bending Strength ◽  
Mechanical Performance ◽  
Knitted Fabric ◽  
Reinforced Composites ◽  
Surface Appearance ◽  
Bending Performance ◽  
Average Loss ◽  
Textile Reinforced Composite ◽  
Warp Knitted Fabric

In order to study on mechanical performance as the target of environmental corrosion resistance property, three kinds of glass fiber fabrics like biaxial warp knitted fabric, biaxial stitch-bonded felt and three axial warp knitted fabric were used to prepare textile reinforced composites in five layers laminated structure, which were soaked in seawater environment for 180 days. The result showed that, the surface appearance of textile reinforced composite became muddy and the color became darker, the tensile strength and bending strength of composites decline of the whole with the extension of soak time, the average loss rate of tensile and bending performance are respectively 24.8% and 56.5%, all of these provide the theoretical basis for researching and developing high-quality composite materials.

scholarly journals Bending properties of 2.5 Dimensional Warp Knitted Fabric Reinforced Composites

1992 ◽  
Vol 1 (6) ◽  
pp. 096369359200100 ◽  
Author(s):  
W-L Wu ◽  
M Kotaki ◽  
H Hamada ◽  
M Inoda ◽  
Z Maekawa ◽  
...  
Keyword(s):  
Future Application ◽  
Knitted Fabric ◽  
Reinforced Composites ◽  
Bending Properties ◽  
Transfer Molding ◽  
Reinforced Composite ◽  
Fabric Structure ◽  
Knitted Structure ◽  
Warp Knitted Fabric ◽  
Face Structure

A study of bending properties of 2.5 dimensional warp knitted fabric reinforced composites is presented. Two kinds of 2.5 dimensional knitted fabric structure have been adopted. It is found that the mechanical properties of 2.5 dimensional warp knitted fabric reinforced composite with face structure of back half is superior to that with face structure of single dembigh. The effect of stretching the knitted structure before molding has also been taken into account. Finally, the future application of the 2.5 dimensional warp knitted fabric, e.g., to the resin transfer molding, is suggested.

scholarly journals Bending properties of Warp Knitted Fabric Reinforced Composites

1992 ◽  
Vol 1 (5) ◽  
pp. 096369359200100 ◽  
Author(s):  
W-L Wu ◽  
M Kotaki ◽  
A Fujita ◽  
H Hamada ◽  
M Inoda ◽  
...  
Keyword(s):  
Bending Strength ◽  
Knitted Fabric ◽  
Back Side ◽  
Reinforced Composites ◽  
Bending Properties ◽  
Knitted Structure ◽  
Warp Knitted Fabric

This paper dealt with the bending properties of warp knitted fabric reinforced composites. With the increasing of course density and the variation of knitted structure, the bending strength and modulus increased in course direction and kept invariable in wale direction. Furthermore, the specimen setting back side of knitted fabric at tensile side exhibited superior bending strength in course direction.

Investigation on Tensile Properties of Two Guide Bar Warp Knitted Fabric Reinforced Composites

2012 ◽  
Vol 602-604 ◽  
pp. 76-79
Author(s):  
Zhi Gang Qin ◽  
Bao Shi
Keyword(s):  
Tensile Properties ◽  
Mechanical Performance ◽  
Structural Parameters ◽  
Testing Machine ◽  
Knitted Fabric ◽  
Reinforced Composites ◽  
Knitted Fabrics ◽  
Tensile Direction ◽  
Warp Knitted Fabric ◽  
Properties Of Composites

The composite laminates are produced by manual molding technology using two guide bar warp knitted fabrics of glass fiber as reinforcement and epoxy resin as matrix. The tensile properties of composites in the course, wale and diagonal directions are tested on the universal material testing machine. The influences of warp knitting stitch structures for mechanical performance of the composites are discussed. The results show that the tensile stress/strain curves of two guide bar warp knitted fabric reinforced composites were nonlinear. The tensile properties of composites possess obvious anisotropic characteristics. The tensile strengths and modulus of the warp knitting fabric composites depend on the yarn numbers bearing load along tensile direction, which are related to the stitches and structural parameters of warp knitted fabrics.

scholarly journals Tensile-tensile Fatigue Behavior of Multi-axial Warp-knitted Reinforced Composite

2018 ◽  
Vol 26 (1(127)) ◽  
pp. 73-80 ◽  
Author(s):  
Iwona Frydrych ◽  
Nannan Tao ◽  
Si Chen ◽  
Liping Wang ◽  
Wei Wu
Keyword(s):  
Fatigue Behavior ◽  
Strain Curve ◽  
Tensile Tests ◽  
Fatigue Behaviour ◽  
Stiffness Degradation ◽  
Knitted Fabric ◽  
Tensile Fatigue ◽  
Strength And Stiffness ◽  
Warp Knitted Fabric ◽  
Composite Samples

An experimental study was carried out on the fatigue behaviour of multi-axial warp-knitted fabric composites. Composite samples reinforced with multi-axial warp-knitted fabric/matrix were manufactured by the vacuum-assisted resin transfer moulding method. Tensile-tensile fatigue cycling was carried out at different load levels, and S-N curves, tensile stress-strain curve and stiffness degradation of the multi-axial composite samples were obtained. Finally post-fatigue tensile tests were done at a stress level of 75%, at the stages of 1/3N and 2/3N, and the equivalent residual strength and stiffness degradation were obtained.

scholarly journals Chemical and physical interactions of regenerated cellulose yarns and isocyanate-based matrix systems

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Bernhard Ungerer ◽  
Ulrich Müller ◽  
Antje Potthast ◽  
Enrique Herrero Acero ◽  
Stefan Veigel
Keyword(s):  
Mechanical Performance ◽  
Tensile Force ◽  
Tensile Modulus ◽  
Tensile Tests ◽  
Size Exclusion ◽  
Regenerated Cellulose ◽  
Hydrolytic Cleavage ◽  
Yarn Twist ◽  
Exclusion Chromatography ◽  
Physical And Chemical

AbstractIn the development of structural composites based on regenerated cellulose filaments, the physical and chemical interactions at the fibre-matrix interphase need to be fully understood. In the present study, continuous yarns and filaments of viscose (rayon) were treated with either polymeric diphenylmethane diisocyanate (pMDI) or a pMDI-based hardener for polyurethane resins. The effect of isocyanate treatment on mechanical yarn properties was evaluated in tensile tests. A significant decrease in tensile modulus, tensile force and elongation at break was found for treated samples. As revealed by size exclusion chromatography, isocyanate treatment resulted in a significantly reduced molecular weight of cellulose, presumably owing to hydrolytic cleavage caused by hydrochloric acid occurring as an impurity in pMDI. Yarn twist, fibre moisture content and, most significantly, the chemical composition of the isocyanate matrix were identified as critical process parameters strongly affecting the extent of reduction in mechanical performance. To cope with the problem of degradative reactions an additional step using calcium carbonate to trap hydrogen ions is proposed.

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