Developments in Reinforced Plastics—5: Processing and by J. B. Cattanach, F. N. Cogswell (auth.), G. Pritchard (eds.)

By J. B. Cattanach, F. N. Cogswell (auth.), G. Pritchard (eds.)

Any sequence with a name starting advancements in. . . is clearly meant to document innovatory and novel principles. the difficulty with innovatory considering is that it usually turns out too esoteric for sensible humans to trouble with. definitely, this booklet isn't really intended basically to be a quick-reference guide for fabricators. Its goal is quite to sign the type of advancements which just about definitely will impinge at the international of strengthened plastics in, say, 4 or 5 years' time. during this specific quantity lots of the authors have without delay or in a roundabout way addressed the sensible difficulties of processing and fabrica­ tion with bolstered plastics. there was no try to evaluate the present state of the art of manufacturing fabricated articles in bolstered plastics through such strategies as filament winding or pultrusion simply because those matters have already been good lined in other places. Nor have I even attempted to supply a complete survey of all which may be known as new during this box. in its place, i've got easily taken a few vital and a little underestimated issues, often fabric­ oriented instead of machine-centred, and requested best figures to summarise the scene. on the probability of showing arbitrary allow us to contemplate the 1st bankruptcy by way of Cattanach and Cogswell. They let us know how a brand new fabric has been produced which not just provides to the variety of composites on hand, it makes attainable new fabrication methods (at least, new to FRP). therefore it may end result finally in lots of new markets and items. The possibilities are lucidly and imagina­ tively set out.

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Integrally reinforced structures can also be fabricated by this technique-Fig. 24. Superplastic forming is a new technology in metal working. We believe that it will prove to be an especially powerful technology for thermoplastic composite materials. Like many other branches of the plastics industry in the development of fabrication technology for APC systems we have borrowed extensively from the best process technologies available for other materials. This is not necessarily a one way traffic: the development of superplastic forming for APC may lead to improved superplastic forming for metals.

Heat the whole of the preformed blank to achieve optimised shaping. Thus to form a 'top hat' section only the material which will end up in the corners and side walls needs to be heated-Fig. 13. For convenience of material handling it may well be sensible to retain rigidity in the preform, and this is obtained by screening part of the blank during the preheating stage. Heat Final Section only shaded area has been shaped FIG. 13. Screening for optimised shaping. PROCESSING WITH AROMATIC POLYMER COMPOSITES FIG.

5. BISHOP, S. , The notch sensitivity and impact peerformance of carbon fibre reinforced PEEK, RAE Farnborough Proc. Int. Symp. on Carbon Fibre Composites, WIM, Erding, 1984. 6. HARTNESS, J. , An evaluation of polyether etherketone matrix composites fabricated from unidirectional prepreg tape, Univ. of Dayton, 29th National SAMPE Symposium, 3-5 April, 1984. 7. COGSWELL, F. N. and LEACH, D. , Continuous fibre reinforced thermoplastics: a change in the rules for composite technology, Plastics and Rubber Processing and Applications, 4 (3), 271 (1984).

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