The influence of yarn fineness and number of yarn layers on in-plane shear properties of 3-D woven fabric

Abstract

The 3-D layer-to-layer angle-interlock woven fabric (LLAIWF) has good deformability on a complicated contour, which offers them a large application potential in the field of aerospace. This article mainly focuses on the influence of yarn fineness and number of yarn layers on in-plane shear properties of 3-D LLAIWF during bias extension. Two methods of varying the thickness of 3-D LLAIWF were designed: changing yarn fineness and changing the number of yarn layers. The deformation mechanism of LLAIWF in bias-extension test was analyzed. The effects of two methods on in-plane shear deformation were compared and analyzed. In addition to the data processing on the experimental curve, digital image correlation analysis was conducted on the test photographs, from which shear angles in different area shear angle were measured. The mesostructure of fabric during the bias-extension test was observed. The effect of decreasing yarn layers on the mesostructure of fabric was observed by cutting fabric. The results demonstrated that the yarn fineness and the number of yarn layers play a key role in the in-plane shear properties of 3-D LLAIWF. In addition, the changing of fabric thickness causes that the deformation is asymmetrical. The effect of warp yarn fineness is similar to that of weft yarn fineness during the bias-extension test. Reducing the internal yarns of the fabric created a gap, where the yarns were reduced. This gap will affect the deformability of the fabric.

Characterizing fabric crease recovery through sequential image analysis

“…Merati and Patir researched the influence of yarn twist on fabric shape retention and found that the crease resistance of the fabric increased with increasing yarn twist [13]. In addition to yarn twist, yarn count and fiber properties are also affect the fabric shape retention [14]. By analyzing the thermodynamic properties of fibers, Park et al found that fabrics composed of synthetic fibers with a low glass transition temperature were less conformable than fibers with a high glass transition temperature [15].…”

Geometrical model of 3D layer-to-layer angle-interlock woven preforms with oblique structure

“…Zheng et al [13] proposed a micro-unit model for analyzing the structure of woven composites, which reflects the fluctuation and deformation of the yarns. Guan et al [14] investigated the influence of the structural parameters of the yarn on the in-plane shear properties of 3D LLA woven fabrics during bias extension. The linear density of the yarn and number of yarn layers in the fabric were found to have a significant influence on the in-plane shear properties.…”