Abstract
Delaminations strongly influence the behaviour of a composite laminate. To study the influence of the interface properties on the delamination growth and the fracture toughness of carbon-epoxy composites, carbon fibres with four different oxidative treatment levels were used. Mode I tests were performed using DCB-tests. Acoustic emission was used to determine the initiation of the delamination from the precrack. Results show a dramatic increase of the fracture toughness initiation value with increasing fibre surface treatment level (up to twice the value for the pure matrix). The propagation value however, reaches a maximum at intermediate treatment level. Mode II testing was performed using ELS tests. The results also show an important increase in mode II fracture toughness with increasing surface treatment level for both initiation and propagation value.
A micromechanical model was developed to explain the direct influence of the fibre surface treatment on the initiation of a delamination. This model predicts the critical strain energy release rate, based upon the fracture toughness of the interface and the matrix and the length over which the delamination follows the interface depends upon the interface strength. The results, calculated by the model match with the experimental results for mode I as well as for mode II loading conditions.
The model only predicts the initiation values, since the propagation fracture toughness is influenced by other energy absorbing effects like fibre bridging (mode I) and friction (mode II).
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References
Keary, P.E. Ilcewicz, L.B., Shaar, C., Trostle, J., J. Comp. Mat., Vol. 19, March 1985, pp 154–177.
Hunston D.L., Composites Technology Review, pp 176–180.
Lee S.M., J. Mat. Sci., Vol. 19, 1984, pp 2278–2288.
Sela N., Ishai O., Composites, Vol. 20,5, 1989, pp 423–436.
McGoldrick C., Morel J., Wevers, M., Verpoest L, Composites, Paris, 1991, pp 284–290.
Wilkins D.J., Eisenmann, J.R., Camin, R.A., Margolis, W.S., Benson, R.A., ASTM STP 775, 1982, pp 168–183.
Lee R.J., Phillips D.C., Composite Structures, 1981, pp 536–554.
Su K.B., Proc. ICCM-V, 1985, pp 995–1006.
Lacroix T., Tilmans B., Keunings R., Desaeger M., Verpoest L, Comp. Sci. Tech, (in print)
Ivens J., Wevers M., Verpoest I, De Meester P., Proc. ECCM-3, 1989, pp 465–471.
Peters P.W.M., J. Comp. Mat., (submitted)
Bradley W.L., Cohen R.N., ASTM STP 876, 1985, pp 389–410.
Russell A.J., Street K.N., Proc. ICCM-IV, 1982, pp 279–286.
Norita, T., Matsui, Ishida, Composite Interfaces, 1986, pp. 123–132.
Robinson, R., et al., High Tech — The way into the Nineties, 1986, pp. 299–310
Broek, D., Elementary Engineering Fracture Mechanics, 4th Ed., 1986
Carlsson L.A., Pipes R.B., Experimental Characterisation of Advanced Composite Materials, 1987.
Davies P., Moore D.R., Comp. Sci. Tech., Vol. 38, 1990, pp 211–227
Saghizadeh, H., Dharan, C.K.H., J. Engineering Materials and Technology, 108 (Oct), 1986.
Albertsen, H., Peters, P.W.M., Proc. IPCM 91, 1991, pp 247–248.
Piggott M.R., Comp. Sci. Tech., Vol. 30, 1987, pp 295–306.
Penn L.S., Lee S.W., J. Comp. Tech. Res., Vol 11, 1989, pp 23–30.
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© 1992 Springer-Verlag, Berlin Heidelberg
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Ivens, J., Wevers, M., Verpoest, I. (1992). An Energy Based Model for the Influence of the Fibre-Matrix Interface Strength on the Interlaminar Fracture Toughness of UD-Composite Laminates. In: Reddy, J.N., Reifsnider, K.L. (eds) Local Mechanics Concepts for Composite Material Systems. IUTAM Symposia. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-84792-9_12
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DOI: https://doi.org/10.1007/978-3-642-84792-9_12
Publisher Name: Springer, Berlin, Heidelberg
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