This paper presents the investigation of the fatigue crack propagation and delamination behaviour of Fibre Metal Laminates stiffened by externally bonded titanium straps. A previously developed prediction model for crack growth in FML is based on superposition of stress intensity factors accounting for crack opening by far field stresses and crack closing by intact fibre layers. This model has been extended to account for the presence of intact or broken externally bonded titanium straps. The approach has been validated with a selection of fatigue crack growth experiments. It is concluded that the developed prediction model predicts the crack propagation and delamination growth in line with observed data, but in addition provides information about the change in fibre bridging stresses in the wake of the crack induced by the presence of external stiffeners.
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