Fibre debonding

Short fibre composites, fibre orientation, fracture toughness, fracture mechanisms, fibre pullout, fibre debonding, critical fibre angle. 

This sharp variation in toughness has been interpreted as a transition between different fracture mechanisms. Matrix fracture and fibre debonding are the prevailing fracture mechanisms at low values of the fibre orientation factor, while at high values the main fracture mechanism is fibre pull-out. Thus, besides a critical fibre length, also a critical fibre angle should be considered. 

A common hazard for reinforced plastics is damage from stones on vehicles, from aircraft runways on airplanes, from collisions between boats and driftwood or between boats and the quayside, or from dropped tools on chemical plant and aircraft wings, and so on. The resulting damage is often difficult to see with the naked eye, but it can include delamination, matrix cracking, fibre debonding and in severe cases, fibre fracture. Particulate... 

Tvergaard, V. (1990) Effect of fibre debonding in a whisker-reinforced metal. Material Science and Engineering A, 125, 203-213. 

Gray, R.J. (1984) Analysis of the effect of embedded fibre length on fibre debonding and pull-out from an elastic matrix. Journal of Materials Science, 19, 861-870. 

Table 4.20 Normal strain range and number of stress cycles to transverse fibre debonding.

Testing has shown that transverse fibre debonding for a number of FRP composites is strain related and independent of the type, proportion and orientation of the glass reinforcement. Thus with a knowledge of the material modulus, the stress to initiate transverse fibre debonding may be calculated for any particular material. Available test data indicate that the strain amplitude to debond varies approximately linearly from 0.3% strain at 10 cycles to 0.1% strain at 10 cycles. 

Investigation of steel fibres debonding processes in cement paste , in ... 

Potrzebowski, J., Investigation of steel fibre debonding processes in cement paste. In Bond in Concrete, ed., P. Bartos, Applied Science Publishers, London, 1982, pp. 51-59. 

Y. Geng and C.K.Y. Leung, A microstructural study of fiber/mortar interfaces during fibre debonding and pull-out , J. Mater. Sci. 31,1996,1285-1294. 

B. Mobasher and C.Y Li, Modeling of stiffness degradation of the interfacial transition zone during fibre debonding , J. of Composite Engineering. 5,1995,1349-1365. 

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