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Computer Aided Design Environment for Composites (CADEC) 14.1.6392.14245

Software Support for Introduction to Composite Materials Design-- 2nd Edition, CRC (2011) by Ever J. Barbero

CADEC -- Fabric Reinforced Composites

Fabric reinforcements are textile materials woven with structural fibers such as carbon, glass, Kevlar, Vectran, and so on. These fibers are also called high performance fibers but really that does not say much; we'd rather call them structural fibers because they are used to reinforce composites that then are used for structural purposes. Textile reinforcements offer some advantages with respect to laminates made of unidirectional composites, including ease of lay-up, superior damage tolerance, and impact resistance of the resulting composite. A fabric-reinforced laminate is a collection of laminae, where each lamina is reinforced with a layer of fabric. Fabric-reinforced composites may be laminated or not, but even a single lamina reinforced with a textile fabric displays many of the features of laminated composites, such as high stiffness and strength in two perpendicular directions. Fabrics are classified as woven, nonwoven, knitted, braided, two-dimensional (2D), and three-dimensional (3D). CADEC can predict all the elastic and strength properties of a fabric-reinforced lamina so that the lamina can be incorporated in a hybrid laminate with all the other types of laminae for which properties are calculated in chapter 4, including unidirectional laminae, continuous strand mat reinforced laminae, and experimental laminae. CADEC can calculate properties for laminae reinforced with planar, orthogonal, square woven fabric/textiles such as plain weave, twill, and satin. A planar weave has no through the thickness features other than the undulation resulting from weaving. An orthogonal weave has tows woven at right angles in the plane of the fabric. The tows laid down in one direction (x-direction) are called fill. Perpendicular to the fill are the warp or weft tows (yarns). The length of the roll of fabric is in the warp direction as the textile is "filled" by the loom in the weaving machine. The reinforcement is described to the software by geometrical and material parameters. The geometrical parameters include the harness, shift, and interlacing. Also input are the fill thickness, warp thickness, matrix thickness, fill width, and warp width. Gaps between the fill and warp tows (or yarns) can be included. The software can predict the stiffness and strength of composite materials reinforced with plain weave, twill, and satin textile, also called fabric. The textile lamina is idealized as a transversely isotropic material. The calculated properties include:

  • Five elastic moduli
  • Seven strength values
  • Two coefficients of thermal expansion
  • Two coefficients of moisture expansion
The calculated textile lamina can be used as any other lamina in the rest of the software.

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