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Graphite fibre reinforced polyimide composites
Graphite fibre reinforced polyimide composites Browing, C. E. and Marshall II, J. A. J Composite Materials, Vol 4, pp 390 - 403 (July 1970) Comparatively low void-content, high strength and modulus composites were produced for a variety of fibres in polyimide resins. Results of high temperature ageing tests are presented which show quite promising strength stability at 600°F. (70/4/137) GRP cladding for Jumbo terminal at Heathrow British Plastics, Vol 43, No 9 (September 1970} The use of large ( l l f t x 10ft) GRP panels in the construction of the Jumbo terminal was the result of a feasibility study by the architects. This was carried out in collaboration with the suppliers and factors influencing the decision to employ GRP were the possibility of making a lightweight, one-piece structure, ease of forming complex shapes without at the same time increasing to any great extent the weight factor and the advantages of integral colour in creating a virtually maintenance free panel. (70/4/138) How to mould new fast-moulding RP Plastics Technology, Vol 16, No 5 [May 1970) The best equipment and o p t i m u m conditions for the moulding of a new glass-reinforced thermoplastic (previously described in Plastics Technology Vol 16, No 4, p 15) are described. The properties of the material are listed and compared with those of nylon. (70/4/139) Met glasvezel gewapende thermoplasten (in Dutch) der Meulen, J. I. Plastica, Vol 23 No 9, pp 393 - 401 [September 1970) General information about factors influencing physical properties such as fibre diameter, fibre length, coupling agents; glass fibre reinforced plastic fabrication; fibre content; and related processing techniques, is given in a condensed form. It is suggested that in the near future the properties of FRTP will be improved greatly, resulting in more extensive application. (70/4/140) New polyimide prepreg designed for high performance Plastics Technology, Vol 16, No 5, pp 1 7 - 18 (May 1970) A new polyimide material, reinforced with glass or carbon, is described. Compared to other polyimides, the material is easy to process and retains good physical properties up to 400 - 500°F. (70/4/141)
New process mates vacuum forming and glass-reinforced polyester spray-up Stayner, V. Reinforced Plastics, Vol 14, No 13, p 378 (September 1970) The Federal Huber Process starts with a modified acrylic sheet which it shapes by thermoforming to give what is essentially a mould which is then sprayed with a glass reinforced polyester. The resultant product is said to be economical in production, strong and with a good surface as good as a moulded surface and it has excellent resistance to weathering. Mould costs are reduced and production is speeded by the use of the thermoformed acrylic as a mould for the spray up process. (70/4/142) Now: improved methods of making reinforced plastics Hunt, R. E. Plastics Technology, Vol 16, No 5, p 55 (May 1970) A brief survey is given of recent improvements which have led to increased productivity of reinforced plastics. A newly developed sheet moulding compound and recent improvements in pultrusion and filament winding techniques are discussed. (70/4/143) Optimum filament orientation criteria Brandmaier, H. E. J Composite Materials, Vol 4, pp 4 2 2 - 425 (July 1970) This short note analyses the effect of filament orientation on composite strength from a consideration of composite shear strength and transverse normal strength. It is suggested that if shear strength is less than transverse strength, then o p t i m u m filament orientation is in the principal stress direction, but if the converse is true the optimum filament orientation is at some direction which is a complex function of at least five variables. The significance of this work is in relation to graphite fibre/epoxy composites at present being evaluated for aerospace application. (70/4/144) Plastic flow and failure of discontinuous-fibre comvosite materials Iremonder, M. J. and Wood, W. G. J Strain Analysis, Vol 5, No 3, p 212 (19 70) Work on idealized plane models of a composite material in which the gaps at the fibre ends are either filled with matrix or left as voids is described. Stress distributions are obtained for the elastic/plastic matrix reinforced with elastic fibres for interacting and non-interacting discontinuities and for varying degrees of matrix work hardening. Failure is simulated in the finite element model and the results compared with observations made by other workers. (70/4/145)
Property and cost advantages with reinforced thermoplastics Miller, W. G. British Plastics, Vol 43 No 8, pp 59 - 63 (August 1970) This report considers the property improvements resulting from the use of reinforcements and shows how competitive reinforced thermoplastics are as materials. Reinforcements considered are glass (spherical and fibrous), asbestos, talc and calcite. The article concludes with a brief mention of processing and tooling for RTP. (70/4/146)
Reinforced plastics in chemical plant British Plastics, Vol 43, No 9, p 105 [September 1970) Reinforced plastics are making substantial inroads into the chemical plant market. This has been aided by the rising cost of nickel, a necessary alloying element in traditional metals used in the manufacture of chemical plant. The Keebush range of components and their manufacturing process are described and it is claimed that despite high labour content, these components are more than competitive with conventional materials. (70/4/147)
Reinforced plastics exhibition British Plastics, Vol 43, No 7, pp 102 - 103 (July 1970) This brief report on the exhibition contains references to several exhibits and concentrates on fabrication machinery and tools. (70/4/148)
RP pipe breaks the cost barrier with base steel Wood, A. S. Modern Plastics, Vol 47, No 7, pp 74 77 (July 1970) A good technico-economic survey of several methods of RP pipe manufacture and marketing methods. In the US, vinyl-epoxy/glass pipe now undersells everything, which points to a bright future. Hand lay-up methods of manufacture now appear to be coming to the end of their profitability even in large diameter pipes, where filament winding and centrifugal casting are on the increase. Several new developments in pipe production are mentioned, including reinforced polyester/ mortar pipes. (70/4/149)
Shrinkage stress concentrations in plane two-phase systems Theocaris, P. S. and Marketos, E. Fibre Science and Technology, 1Iol 3 No 1, p 21 (July 1970) The results of an investigation into the stress concentrations created by matrix shrinkage in a two phase
COMPOSITES December 1970
387
New process mates vacuum forming and glass-reinforced polyester spray-up Stayner, V. Reinforced Plastics, Vol 14, No 13, p 378 (September 1970) The Federal Huber Process starts with a modified acrylic sheet which it shapes by thermoforming to give what is essentially a mould which is then sprayed with a glass reinforced polyester. The resultant product is said to be economical in production, strong and with a good surface as good as a moulded surface and it has excellent resistance to weathering. Mould costs are reduced and production is speeded by the use of the thermoformed acrylic as a mould for the spray up process. (70/4/142) Now: improved methods of making reinforced plastics Hunt, R. E. Plastics Technology, Vol 16, No 5, p 55 (May 1970) A brief survey is given of recent improvements which have led to increased productivity of reinforced plastics. A newly developed sheet moulding compound and recent improvements in pultrusion and filament winding techniques are discussed. (70/4/143) Optimum filament orientation criteria Brandmaier, H. E. J Composite Materials, Vol 4, pp 4 2 2 - 425 (July 1970) This short note analyses the effect of filament orientation on composite strength from a consideration of composite shear strength and transverse normal strength. It is suggested that if shear strength is less than transverse strength, then o p t i m u m filament orientation is in the principal stress direction, but if the converse is true the optimum filament orientation is at some direction which is a complex function of at least five variables. The significance of this work is in relation to graphite fibre/epoxy composites at present being evaluated for aerospace application. (70/4/144) Plastic flow and failure of discontinuous-fibre comvosite materials Iremonder, M. J. and Wood, W. G. J Strain Analysis, Vol 5, No 3, p 212 (19 70) Work on idealized plane models of a composite material in which the gaps at the fibre ends are either filled with matrix or left as voids is described. Stress distributions are obtained for the elastic/plastic matrix reinforced with elastic fibres for interacting and non-interacting discontinuities and for varying degrees of matrix work hardening. Failure is simulated in the finite element model and the results compared with observations made by other workers. (70/4/145)
Property and cost advantages with reinforced thermoplastics Miller, W. G. British Plastics, Vol 43 No 8, pp 59 - 63 (August 1970) This report considers the property improvements resulting from the use of reinforcements and shows how competitive reinforced thermoplastics are as materials. Reinforcements considered are glass (spherical and fibrous), asbestos, talc and calcite. The article concludes with a brief mention of processing and tooling for RTP. (70/4/146)
Reinforced plastics in chemical plant British Plastics, Vol 43, No 9, p 105 [September 1970) Reinforced plastics are making substantial inroads into the chemical plant market. This has been aided by the rising cost of nickel, a necessary alloying element in traditional metals used in the manufacture of chemical plant. The Keebush range of components and their manufacturing process are described and it is claimed that despite high labour content, these components are more than competitive with conventional materials. (70/4/147)
Reinforced plastics exhibition British Plastics, Vol 43, No 7, pp 102 - 103 (July 1970) This brief report on the exhibition contains references to several exhibits and concentrates on fabrication machinery and tools. (70/4/148)
RP pipe breaks the cost barrier with base steel Wood, A. S. Modern Plastics, Vol 47, No 7, pp 74 77 (July 1970) A good technico-economic survey of several methods of RP pipe manufacture and marketing methods. In the US, vinyl-epoxy/glass pipe now undersells everything, which points to a bright future. Hand lay-up methods of manufacture now appear to be coming to the end of their profitability even in large diameter pipes, where filament winding and centrifugal casting are on the increase. Several new developments in pipe production are mentioned, including reinforced polyester/ mortar pipes. (70/4/149)
Shrinkage stress concentrations in plane two-phase systems Theocaris, P. S. and Marketos, E. Fibre Science and Technology, 1Iol 3 No 1, p 21 (July 1970) The results of an investigation into the stress concentrations created by matrix shrinkage in a two phase
COMPOSITES December 1970
387