3-D textile reinforcements in composite materials 13 Biaxial High modulus Multilayer Triaxial Tubular Tubular braid woven woven woven woven braid laid in warp 远说 Weft knit Weft knit Weft knit Square Square braid Weft knit laid in weft laid in warp laid in weft braid laid in warp laid in warp 敢理刀 D Warp knit Warp knit Weft inserted Weft inserted XD Stitchbonded warp knit warp knit wo'ssaudmau'praypoow//:dny Aq laid in warp laid in warp laid in warp 2L-10e Biaxial XYZ Flat braid Flat braid 3-D braid 3-D braid bonded laid in system laid in warp laid in warp 1.2 Examples of yarn-to-fabric preforms. Table 1.2.A comparison of yarn-to-fabric formation techniques YTF processes Basic direction of Basic formation technique yarn introduction Weaving Tw0(0°/90) Interlacing (by selective warp and fill insertion of90°yarns into0°yarn system Braiding One (machine Intertwining (position displacement) direction) Knitting 0ne(0°or90y Interlooping (by drawing warp or fill loops of yarns over previous loops) Nonwoven Three or more Mutual fiber placement (orthogonal)3-D textile reinforcements in composite materials 13 Biaxial woven High modulus woven Multilayer woven Triaxial woven Tubular braid Tubular braid laid in warp Weft knit Weft knit laid in weft Weft knit laid in warp Weft knit laid in weft laid in warp Square braid Square braid laid in warp Stitchbonded laid in warp XD Weft inserted warp knit laid in warp Weft inserted warp knit Warp knit laid in warp Warp knit Biaxial bonded XYZ laid in system Flat braid Flat braid laid in warp 3-D braid 3-D braid laid in warp 1.2 Examples of yarn-to-fabric preforms. Table 1.2. A comparison of yarn-to-fabric formation techniques YTF processes Basic direction of Basic formation technique yarn introduction Weaving Two (0°/90°) Interlacing (by selective warp and fill insertion of 90° yarns into 0° yarn system Braiding One (machine Intertwining (position displacement) direction) Knitting One (0° or 90°) Interlooping (by drawing warp or fill loops of yarns over previous loops) Nonwoven Three or more Mutual fiber placement (orthogonal) RIC1 7/10/99 7:15 PM Page 13 Copyrighted Material downloaded from Woodhead Publishing Online Delivered by http://woodhead.metapress.com Hong Kong Polytechnic University (714-57-975) Saturday, January 22, 2011 12:29:37 AM IP Address: 158.132.122.9