Carbon fibre composites with rubber toughened matrices
Tóm tắt
In carbon fibre reinforced plastics (CFRP), the initial resistance to crack propagation parallel to fibres is determined largely by the matrix toughness. The fracture toughness (G
IC) of an epoxide resin can be increased considerably by the addition of butadieneacrylonitrile co-polymers (CTBN). These cause the precipitation of small spheres of a second phase and, for example, increaseG
IC from ∼ 300 to ∼ 3000 J m−2 on the addition of 9 wt% CTBN. The large increases obtained in bulk resins are not obtained in CFRP, instead significant but modest increases are achieved. The suppression of toughness is related to the thickness of resin film through which the crack propagates.
Tài liệu tham khảo
P. W. R. Beaumont andB. Harris, “Carbon Fibres — Their composites and applications”, Proceedings of the International Conference organized by the Plastics Institute (1971) Paper No. 49.
G. R. Sidey andF. J. Bradshaw,ibid Paper No. 25.
P. W. R. Beaumont andD. C. Phillips,J. Composite Materials 6 (1972) 32.
D. C. Phillips,ibid 8 (1974) 130.
F. J. McGarry,Proc. Roy. Soc. Lond A319 (1970) 59.
Information quoted in B. F. Goodrich Chemical Co. published literature on “Hycar” elastomers, based on work by F. J. McGarry and A. Willmer MIT R68-68, 1968.
N. L. Hancox andH. Wells, AERE-R7296 (1973).
J. V. Larsen, 26th Annual Technical Conference, 1971, Reinforced Plastics/Composites Division, The Society of the Plastics Industry Inc. Paper No. 10-D.
M. Hockney, private communication.
S. Mostovoy, P. B. Crosley andE. J. Ripling,J. Materials 2 (1967) 661.
C. B. Bucknall andR. R. Smith,Polymer 6 (1965) 437.
J. Lilley andD. G. Holloway,Phil. Mag. 28 (1973) 215.
A. Van Den Boogart, “The Physical Basis of Yield and Fracture”, Institute of Physics Conference Proceedings1 (1966) 167.