Wyniki wyszukiwania - BazTech

Ograniczanie wyników

2 Archives of Civil and Mechanical Engineering

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Influence of textile grid forms on tensile mechanical behaviors of carbon textile-reinforced composites with polyethylene (PE) short fibers

Wu Zhiyan, Deng Mingke, Tian Ting, Dong Zhifang, Sun Yanting, Zhang Wei

Archives of Civil and Mechanical Engineering

2023

Vol. 23, no. 2

art. no. e103, 2023

Textile-reinforced composite (TRC) is a new material composed of finely grained cement-based concrete and textile grids, which can be a substitute for fiber-reinforced polymer (FRP) in strengthening applications. The diversity of the textile grid results in a difference in bond behaviors at the textile-matrix interface, which influences the tensile properties of TRC. Several researchers have investigated the tensile behaviors of TRC, mainly concentrating on the matrix strength, the content of short synthetic fibers, and the number of textile grids; discussions on the textile grid geometry, especially the coupling effect between the textile grid form and matrix category, remained limited. Therefore, this paper focuses on the effects of three carbon textile grids on the tensile behavior of TRC through a uniaxial tensile test; the design parameters also include the textile reinforcement ratio and matrix category. Twenty-seven groups of tensile samples were manufactured to investigate the effect of each variable on the crack distribution, failure pattern, stress-strain curve and characteristic parameter. The test results showed that flattening the roving diameter and especially thinning the coating depth ameliorated the matrix-to-textile permeability, and consequently improved the tensile mechanical properties of TRC. The enhancement level of tensile strength by increasing the textile reinforcement ratio was lower than that by optimizing textile grid form. In terms of different textile grid forms, the effect of the matrix category on the tensile performance of TRC showed significant differences. Finally, an analytical model is presented to forecast the stress-strain behavior of TRC with textile rupture failure.

Experimental study on the mechanical properties of textile reinforced mortar (TRM) composites with different yarn shapes subjected to uniaxial tension

Dong Zhifang, Dai Jie, Deng Mingke, Wu Zhiyan

Archives of Civil and Mechanical Engineering

2022

Vol. 22, no. 4

art. no. e185, 2022

Textile reinforced mortar (TRM) has been applied to retrofit or reinforce the masonry and reinforced concrete (RC) buildings due to the promising tensile properties. The presented work mainly investigated the tensile behaviors of TRM composites with different shapes of carbon multifilament yarns and types of matrices. The flatter shape of yarn has a larger bonding area for the same cross section area of the yarns compared with the elliptical ones. The specimens reinforced with the elliptical and flatter sectional shape of yarns were compared in terms of failure mode, tensile strength, tensile stress–strain response and strain energy. The results showed that the tensile strength can be enhanced by 11% ~ 67%. The utilization of the textiles in the matrix was significantly improved. It demonstrated the fact that the stress difference between the core and outer of yarns was significantly reduced. The flatter shape of yarn effectively contributed to the enhancement of bonding property. The slippage between yarns and matrix was prevented owning to the larger bonding area. Finally, based on the shape coefficient related to the section shape of the yarn, a modified index model was suggested to predict the tensile strength.