By A. G. Bratukhin, V. S. Bogolyubov, G. M. Gunyaev (auth.), A. G. Bratukhin, V. S. Bogolyubov (eds.)
Some years in the past in Paisley (Scotland) the overseas convention on Composite fabrics, headed by way of Professor I. Marshall, came about. throughout the convention, I offered a paper at the production and houses of the Soviet Union's composite fabrics. Soviet had made nice achievements within the production of composite fabrics for aerospace and rocket purposes. for instance, the fraction of composites (predominantly carbon fibre strengthened plastics) within the huge passenger aircrafts Tu-204 and 11-86 is 12-15% of the constitution weight. the share by way of weight proportion of composites in army plane is larger and the fraction of composites (organic fibre strengthened plastics) utilized in army helicopters exceeds a 1/2 the full constitution weight. The nostril elements of such a lot rockets are produced in carbon-carbon fabrics. within the Soviet spacecraft 'Buran' many fuselage tubes are made up of boron-aluminium composites. Carbon-aluminium is used for house mirrors and gasoline turbine blades. those are only a number of examples of purposes. Many contributors on the Paisley convention recommended that the tremendous Soviet event within the box of composite fabrics may be distilled and offered within the type of a finished reference book. So the assumption of the education and booklet of a six quantity paintings Soviet complex Composites expertise, edited by means of Professor I. Marshall and me, was once born.
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S. I. A. I. 1 CLASSIFICATION OF METHODS FOR PREPREG PRODUCTION Prepregs - semifinished products of polymeric composite materials (SPPCM) - present a system of fibrous fillers organized in a certain way and combined with polymeric binders. They are used for manual or mechanized (laying out, winding) assembly (forming) of blanks (piles) with a designer-specified scheme of fibrous filler orientation, with configuration close to that of the final part, which are then shaped into the part by pressing, vacuum, pneumatic, autoclave or thermocompression methods or by pultrusion.
In some cases the application of prepregs increases the cycle time and labour consumption of production processes. Therefore it is best to apply them when it is necessary to improve the quality and toughness relative to weight of parts, thereby decreasing the spread of physicomechanical properties of polymeric composite materials (PCM). The choice of binder type and the nature and structural orientation of the fibrous filler in a prepreg is determined by the requirements imposed on the final part.
To prevent the binder settling in the chamber (1), the drawing speed of the cloth filler through the impregnation bath is made to equal the speed of movement of the binder in the intra fibrous space. Pneumovacuum impregnation For pneuomovacuum impregnation, an ordinary impregnation plant is equipped with a special vacuum chamber, through which the fibrous filler is drawn. The binder is pumped under pressure into the intra fibrous space of the filler in the chamber. Piles assembled from fibrous fillers and packed in rigid moulds (Fig.
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