Studies on bending and shear behaviours of woven fabrics (original) (raw)
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Study of woven fabric shear behaviour
Journal of the Textile Institute, 2011
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Mechanical properties of a woven fabric
This paper, introducing some recent research progress, consists of two parts: the shear deformation analysis and Poisson's ratios for woven fabrics. The analytical methods of the shear moduli and Poisson's ratios for woven fabrics will enable more rigorous studies on such important issues of fabric bending and draping behaviors.
Shear deformation analysis for woven fabrics
Composite Structures, 2005
A new mechanical model is proposed in this paper to evaluate the shearing properties for woven fabrics during the initial slip region. Compared to the existing mechanical model for fabric shear, this model involves not only bending but also torsion of curved yarns. This model has the advantage of taking into consideration the yarn undulation in fabrics while keeping mathematical rigor. Moreover, an erroneous formula in the previous research work from a referenced paper is modified. Analytical results show that this model provides better agreement with the experiments for both the initial shear modulus and slipping angle than the existing model. The approach for this model can be extended to predict other mechanical properties of fabrics in order to obtain more precise results.
Role of fibre, yarn and fabric parameters on bending and shear behaviour of plain woven fabrics
2019
Influence of fibre blend, yarn count and fabric sett (thread density) on bending and shear rigidities of plain woven fabric has been studied. Fifteen plain woven square fabrics have been woven using 20, 30 and 40 Ne yarns of three different blends (100% cotton, 100% polyester and 50:50 polyester-cotton). The fabric samples are produced at three levels according to the Box and Behnken design of experiment methodology. Fabric bending and shear rigidities are measured by using Kawabata Evaluation System (KES) at low stress region. An increasing trend of fabric bending and shear rigidities are observed with lower proportion of polyester, coarser yarn count and higher fabric sett. Yarn count is found to be the most important parameter influencing fabric bending and shear rigidities followed by fabric sett and blend proportion of polyester. A strong degree of association is found between bending and shear rigidities of fabric.
Characterization of mechanical behavior of woven fabrics: Experimental methods and benchmark results
Composites Part A: Applied Science and Manufacturing, 2008
Textile composites made of woven fabrics have demonstrated excellent mechanical properties for the production of high specific-strength products. Research efforts in the woven fabric sheet forming are currently at a point where benchmarking will lead to major advances in understanding both the strengths and the limitations of existing experimental and modeling approaches. Test results can provide valuable information for the material characterization and forming process design of woven composites if researchers know how to interpret the results obtained from varying test methods appropriately. An international group of academic and industry researchers has gathered to design and conduct benchmarking tests of interest to the composite sheet forming community. Shear deformation is the dominative deformation mode for woven fabrics in forming; therefore, trellis-frame (picture-frame) and biasextension tests for both balanced and unbalanced fabrics have been conducted and compared through this collaborative effort. Tests were conducted by seven international research institutions on three identical woven fabrics. Both the variations in the setup of each research laboratory and the normalization methods used to compare the test results are presented and discussed. With an understanding of the effects of testing variations on the results and the normalization methods, numerical modeling efforts can commence and new testing methods can be developed to advance the field.
Journal of Engineered Fibers and Fabrics
Behavior of woven fabrics during complex deformations is most influentially affected by their shear behavior. Shear characteristics of woven fabrics can be explained by fabric shear rigidity and shear hysteresis. In this study, the effects of weft density, weft count, and fiber type on shear behavior of woven fabrics in the principal directions of fabric were statistically evaluated. Statistical methods such as multiple linear regression analysis, univariate test, and correlation analysis were also applied. The univariate test results confirmed that the weft density is the most dominant parameter that affects fabric shear properties. Multiple linear regression results point to poor shear behavior in woven fabrics with cotton weft yarns. In addition, correlation between the shear rigidity of the fabrics along principal directions with the Milasius fabric firmness factor and the fabric cover factor as integrated structural parameters was established. High correlation was found to exis...
The Effect of the Relative Weaving Factor and the Texture of the Fabric to the Bending Properties
2014
The subject of our work has been to study the drapeability of differently structured polyester fabrics and compare the flexibility of uncoated and coated fabrics. This project is connected to the corporate research of the BME Department of Polymer Engineering (Budapest) and the ESITH Research and Development Laboratory (Casablanca). The samples were analyzed with the co-created instruments of the Department of Polymer Engineering and the Department of Mechatronics, Optics and Engineering Informatics of BME, which can be used to test the draping, buckling, and bending properties of the fabrics. In the present work the relative weaving factor was used as well to characterize the difference in weaves and the bending behaviour of fabrics. The flexibility of fabrics as an important property of the wearability was tested with three methods. The bending moduli of uncoated and coated fabrics were compared as a function of the relative weaving factor.
The paper analyses the tensile behaviour of woven fabrics made from 45%Wool + 55%PES used for garments. Analysis of fabric behaviour during wearing has shown that these are submitted to simple and repeated uniaxial or biaxial tensile strains. The level of these strains is often within the elastic limit, rarely going over yielding. Therefore the designer must be able to evaluate the mechanical behaviour of such fabrics in order to control the fabric behaviour in the garment. This evaluation is carried out based on the tensile testing, using certain indexes specific to the stress-strain curve. The paper considers an experimental matrix based on woven fabrics of different yarn counts, different or equal yarn count for warp and weft systems and different structures. The fabrics were tested using a testing machine and the results were then compared in order to determine the fabrics' tensile behaviour and the factors of influence that affect it.From the point of view of tensile testin...
Effect of Construction on Strain distribution in Woven Fabrics under Uniaxial Tensile Deformation
Journal of Engineered Fibers and Fabrics, 2013
Woven fabrics form an integral part of technical textiles where strength is of prime importance. Amongst various factors found to affect the tensile properties of woven fabrics, change in weave and numbers of yarns is expected to alter initial crimps, ease of crimp interchange and fabric assistance in both the principle directions of testing. Accordingly, a strain analysis of plain and satinette woven fabric samples in raveled strip testing mode were undertaken in this work. The samples were generated under similar weaving conditions while varying only the pick density systematically. An analysis of the strain pattern reveals many interesting observations, the most significant ones being (1) the direct relation between the percentage yarn strength utilization in fabric with the uniformity of strain levels along the two principal directions and (2) a significant difference in the strain distribution of samples tested along warp and weft directions irrespective of the construction.