By Jinlian Hu,Textile Institute (Manchester, England)
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Extra info for 3-D fibrous assemblies: properties, applications and modeling of three-dimensional textile structures
3 Pressure bag moulding during stage one. For this reason, these processes are the most viable for large wind turbine blades, and will be the focus of this study. For future modelling this process will be described in two stages. Stage one consists of injecting the resin into the mould, and stage two is when pressure is applied to the bagging to force the resin through the thickness. 3. Due to their similarity, the FASTRAC and pressure bag moulding processes are presented together. 3 Three-dimensional woven fabrics Woven fabrics are probably by far the most commonly used form of textile composites in structural applications (Laroche and Vu-Khanh, 1994).
The through-thickness yarns can then be introduced by stitching (or knitting) needles which are inserted into each pipe and pushed through the thickness of the fibre bed. As shown in Fig. 25, the yarns are looped over a selvedge yarn at the bottom of the fibre array, which effectively binds the preform together. By changing the base plate, various 3-D shapes can be formed. , 2006). , 1994). 25 Non-woven fibre architecture. 26 Structure of Napco® 3-D non-woven fabric: 1 – top layer; 2 – bottom layer; 3 – connecting layer (bridge fibres from 1); 4 – bridge fibres from 2; 5 – needle stitch; 6 – distance between bridge fibres depending on stitch depth; 7 – distance between bridge fibres depending on needle density; 8 – take-out direction; 9 – product thickness depending on the spacer’s width.
19), four yarn carriers can surround a rotor and can move in four diagonal directions which are determined by the rotation of the rotors. The addition of axial yarns and the addition and subtraction of braider yarns allows for changes in fabric geometry and the ability to braid complex shapes. Advantages of three-dimensional braided structures • 3-D braiding has the ability to produce complex near-net-shape preforms. • 3-D braiding processes can be automatically controlled, which increases production and preform quality.