40207_17 - MATCHED METAL COMPRESSION MOLDING OF POLYMER...

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MATCHED METAL COMPRESSION MOLDING OF POLYMER COMPOSITES 17 Enarnul Haque and Burr (Bud) L. Leach 17.1 INTRODUCTION In today’s highly competitive global economy, the need for materials with the right properties to meet the demands of design, environment, durability and economics is growing. Composite materials, with their high strength and stiffness-to-weight ratios, have many advantages and are a desirable engineering material. There is no universal definition of compos- ites. In general, a composite material is a heterogeneous material system consisting of two or more physically distinct materials. In a composite material system, the individual materials exhibit their unique properties and the composite as a whole shows properties that are different from its constituents. In addition to the constituents’ unique properties, the properties of composites are also dependent on the form and structural arrangements of the constituents and the interaction between the constituents. Broadly speaking, composites consist of two components, a binder or matrix and a reinforcement. The matrix functions as the body constituent, serving to bind the rein- forcement together and giving the composite its bulk form. The reinforcements are the struc- tural constituents, providing high strength to the internal structure of the composite. Handbook of Composites. Edited by S.T. Peters. Published in 1998 by Chapman & Hall, London. ISBN 0 412 54020 7 Reinforcement may take the form of fibers, particles, laminate, flakes fillers. Depending upon the type and orientation of the reinforcement and the manufacturing tech- nology required to produce them, composites with various properties and cost can be fabri- cated. Polymer composites are composites in which the binder or matrix is a polymeric material and the reinforcement is usually a thin fibrous material. Polymer composites can have either a thermosetting or thermoplastic matrix. In this chapter we will discuss ther- mosetting matrix based composites. Reinforcing fibers may also be of various kinds, with glass (E-type), carbon, or organic fibers (e.g. aramid) being the most common. Glass fibers are the most widely used type of reinforcement since they offer good strength and moderately high temperature resistance (about 260°C) at a cost effective price. Glass fibers also come in various forms. They can be continuous filaments, cut or chopped strands, roving and yarns, or in the form of cloth, mats or tapes. Thus allows glass fibers to be used in a variety of applications such as lay-up, fila- ment winding, matched die-molding, etc. In this chapter we discuss the matched metal compression molding of thermoset based poly- mer composites. Matched metal compression molding is a molding process in whch the cure is obtained while the material is restricted between two mold surfaces and the loading and closing of the mold causes the material to conform to the desired configuration. This
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Background 379 process enables large scale production of large surface area parts with contour problems and tight tolerances. Matched metal compression
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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_17 - MATCHED METAL COMPRESSION MOLDING OF POLYMER...

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