High-performance textiles are now widely used in civil engineering applications. This work explores the differences between the tensile properties of weft inlay warp-knitted fabrics of high-strength glass and carbon rovings as concrete reinforcements. In this study, 12 types of warp-knitted fabrics with different stitch patterns, including tricot, cord, and pillar stitches, were produced. The effect of the stitch type on the tensile properties of the fabrics was examined. The stitch type was found to significantly affect the tensile properties of the warp-knitted fabrics. The results showed that the tensile strength of fabrics with tricot and cord stitches is greater than that of fabrics with the pillar stitch. The increase in tensile strength was 14% for fabrics made of glass roving and 21% for fabrics made of carbon rovings. A similar gradation was observed for the Young's modulus of the fabrics. The Young's modulus was 11% and 25% higher for glass and carbon fabrics, respectively. The structural parameters of the warp-knitted fabrics, including the geometry of the stitch pattern and the yarn cross-sectional shape in a fabric that affect the tensile properties, were analyzed.
A prospective method for manufacturing thermoplastic composites involves commingling to produce hybrid yarn consisting of two components: reinforcement fibres and thermoplastic matrix. In this work, various types of commingled hybrid yarns were developed to improve blend uniformity and achieve homogeneous filament distribution in two-component hybrid yarns. An experiment was carried out to examine the distribution of filaments in a series of glass/polypropylene commingled hybrid yarns. The influence of changes in process parameters such as the degree of overfeeding, production speed, and air pressure on the filament distribution in the cross-section of commingled hybrid yarns was investigated. In this study, new technological approaches to achieve blend uniformity in commingled hybrid yarns are developed. The radial distribution index and a new blending coefficient were used to evaluate the blending uniformity of the yarns.
A prospective method for structural health monitoring of engineering materials and structures is based on embedded strain sensors in the form of electrically conductive carbon rovings. This article presents the results of the application of carbon rovings and the development of flexible textile fabrics based on these rovings for measuring the deformation in engineering materials, including concrete and polymer-and cement-based composites. The possibility of using carbon rovings as a strain sensor is demonstrated via measurements in tensile and four-point bending tests. The experimental setups and methods for measuring the electrical resistance of carbon roving as a function of strain in the roving, concrete, and composites are described. A good correlation has been found between the electrical resistance-strain curve of the carbon roving (used as a calibration curve) and the measurements in the concrete and polymer composites from tensile tests. The difference in the character of the flexural behavior and the electrical signal in the carbon roving cement-based composite, affected by the stitch type and shape of the carbon roving cross section in textile fabric, was found through four-point bending tests.
In this work, the tensile property retention characteristics of high-performance glass and carbon rovings in warp-knitted reinforced fabrics and cement-based composites used in structural applications were investigated. Three types of warp-knitted fabrics, with differing stitch patterns, and cement-based composites were produced. The tensile strength retention and Young’s modulus retention of the roving in these fabrics and their influence on the properties of cement-based composites were compared on the basis of the stitch type. Samples of warp-knitted fabrics composed of glass fibres and carbon fibres exhibit retention of 76–87% and 65–87.6%, respectively, of the initial strength of the rovings. The highest Young’s modulus retention (∼80%) occurs in the case of the fabric sample composed of glass rovings. The retention of the Young’s modulus in the fabric samples composed of carbon rovings was 37–60%. In addition, the translation of strength from the roving to the fabric and retention of the Young’s modulus in the carbon rovings decreased with increasing strength and modulus, respectively, of the original roving. On the basis of the data presented, we provided guidelines for the possible application of the developed fabrics. As conclusion, it is possible to reduce the cost of the raw materials by using fabrics whose original rovings have low tensile strength and Young’s modulus, but high retention properties.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.