Influence of a static torque on plasticity and asperity-induced closure effects during fatigue crack growth in bainitic steel cylinders loaded in push-pull

Mode I fatigue crack growth with a superimposed static torque was investigated in bainitic steel. The had little effect on kinetics and path. However, the non-singular stress parallel to front, bending stresses due eccentric triggered twisting, even mode I. A progressive increase sliding displacement rise elastic torsional compliance, but also plastic ratchetting at tip, shearing of face asperities, which reduced enhancement roughness-induced closure by torque, however shown enhance plasticity-induced closure.