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In this work mixed mode (I+ II) fatigue crack propagation resistance has been investigated considering CTS (Compact Type Shear) specimens. Mode I fatigue crack propagation results have been compared with those obtained considering CT (Compact Type) specimens with different stress ratios. The loading frequency influence has been also investigated considering both the crack propagation curves and the crack propagation angles. Fracture surfaces have been investigated by means of a scanning electron microscope (SEM).