40207_18 - TEXTILE PREFORMING Frank K . KO a nd George W. D...

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TEXTILE PREFORMING Frank K. KO and George W. Du 18 18.1 INTRODUCTION Textile preforming is a fiber placement method utilizing textile processes prior to the formation of composite structures. Textile pre- forms are the structural backbone of a composite analogous to the structural steel framework in a building. Starting with linear assemblies of fibers in continuous and/or dis- crete form, these micro-fibrous structures can be organized into one-, two- or three-dimen- sional structures by means of twisting, interlacing, intertwining or interlooping. By proper selection of the geometry of the fibrous structures and architecture and the method of placement or geometric arrangement of the fibers, the structural performance of the resulting composite can be tailored. These fiber placement methods create textile pre- forms which possess a wide spectrum of pore geometries and pore distribution; a broad range of structural integrity and fiber volume fraction; and fiber orientation distribution as well as a wide selection of formed shape and net shape capability. As illustrated in Fig. 18.1, textile preforming provides a link between raw material systems and the composite product. Depending upon the textile preforming method used, the range of fiber orientation and fiber volume fraction of the preform will vary, subsequently affect- ing matrix infiltration and consolidation as well as the translation efficiency of fiber prop- erties to composite product. Vacuum Impregnation Squeeze Casting Y I..CU Vacuum Infiltration Design and material system selection Liquid Impregnation K Fig. 18.1 The role of preforms in composite processing. Composite Product Handbook of Composites. Edited by S.T. Peters. Published in 1998 by Chapman & Hall, London. ISBN 0 412 54020 7
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398 Textile preforming When combined with high performance fibers, matrices and properly tailored fiber/matrix interfaces, fiber architecture promises to expand the design options for the manufacturing of tough and reliable structural composites. With an integrated network of structural cells in two- and three-dimensional arrangements, textile structures not only pro- vide a mechanism for structural toughening of composites but also facilitate the processing of composites into net or near net shape struc- tural parts. Considering the important role which tex- tile preforms play in the chain of composite manufacturing processes, there is a worldwide revival of interest in the technology and sci- ence of the processing of textile preforms for composites. The serious interest in the subject of textile composites can best be illustrated in the two recent publications on textile compos- ites, one in English (Chou and KO, 1989) and the other in Russian (Tarnpolski’i et al., 1987). These two books have been translated respec- tively into Russian and English. Special journal issues have been devoted to the subject of textile composites as well (for example, Jouvnal of The Textile Institute, 1990, No. 4, Textile Institute). This article intends to pro- vide a quick reference to textile preforming
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This note was uploaded on 03/16/2010 for the course MECHANICAL ME765401 taught by Professor Prof.sulis during the Spring '10 term at Institut Teknologi Bandung.

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40207_18 - TEXTILE PREFORMING Frank K . KO a nd George W. D...

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