This study investigates the interfacial behaviour of the contact surfaces of the sleeve-pin-shaft connections under axial and torsional cyclic loading. Fatigue experiments for the connections have been performed in a previous study using a biaxial materia This study investigates the interfacial behaviour of the contact surfaces of the sleeve-pin-shaft connections under axial and torsional cyclic loading. Fatigue experiments for the connections have been performed in a previous study using a biaxial materia