Download 3-D fibrous assemblies: properties, applications and by Jinlian Hu,Textile Institute (Manchester, England) PDF
By Jinlian Hu,Textile Institute (Manchester, England)
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Additional resources for 3-D fibrous assemblies: properties, applications and modeling of three-dimensional textile structures
16 Braid structure. , 2005). A typical 3-D braided structure is shown in Fig. 16. , 2005). Principle of three-dimensional braiding The 3-D braids are produced by a number of processes including the track and column (3-D circular loom) method (Brown and Ashton, 1989), the two-step braiding method (Popper and McConnell, 1987), and a variety of displacement braiding techniques. The basic braiding motion includes the alternate x and y displacement of yarn carriers followed by a compacting motion. The proper positioning of the carriers and the joining of various rectangular groups through selected carrier movements accomplish shape formation.
This trend continues with the 3-D fibre assemblies dis- © Woodhead Publishing Limited, 2008 Introduction to three-dimensional fibrous assemblies 31 cussed in this chapter. The 3-D weaving, knitting, braiding and non-woven processes and resulting preforms offer many advantages in both performance and economics. These 3-D fabrics will continue to gain acceptance as more companies recognize the value these materials offer. Technocrats using 3-D preforms could efficiently and accurately design totally new materials, novel manufacturing processes and new fabric structures to accelerate the fabric development process and foster innovation.
12(a). A woven structure in which the multilayer warp moves between the top and bottom of the material, thus providing x and y directions at an angle of 45°, and with weft yarns crossing between the warp providing the z direction, is shown in Fig. 12(b). In general, a variety of 3-D structures can be accomplished. For example, the warp yarns can go only part-way across the whole material (Fig. 13(a)), or one set of warp yarns can be introduced in the axial direction and one set angled, thus providing yarns in four different directions (Fig.