“…When dealing with fatigue, crack growth may occur also sub-critically, that is at a value of stress lower than that shown by the solid line in Figure 1. Among cyclic cohesive models, some were applied to the modelling and prediction of fatigue in bulk, ductile materials [5,6,7,8,9,10,11,12,13,14,15,16] or quasi-brittle polymers [17] while, at the same time, several others were developed with reference to applications involving failure at the interfaces, such as debonding in adhesive joints or delamination and matrix cracking (followed by delamination) in polymer composites [18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37].…”