Abstract
A series of investigations is carried out to understand the crack growth behaviour under various stress ratios and amplitudes of cyclic load, respectively, on fibre metal laminates (FML) composites. The results of the investigation show that the increase of the stress ratio reduces the fatigue life and increases the crack growth rate of the composite. These relate to the displacement on every material forming the composite and to the delamination in the zone nearby the crack tip when the composite was cycled under constant cyclic load. Besides this, fibre-epoxy bridging contributes to lower the crack growth rate. The bridging occurs if the displacement between the monolithic aluminium and the fibre-epoxy is not too different.
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