Abstract：Based on the finite element simulation on the cyclic deformation of notched bar made from U75V steel under the asymmetrical uniaxial stress-controlled cyclic loading condition, the stress/strain distributions and correspondent stress/strain concentration coefficients at the notch root as well as their evolutions during the cyclic deformation are studied. Then, the applicability of Neuber rule to analyze the local stress-strain response at the notch root of the notched component is discussed with the ratchetting considered. The results show that during the cyclic deformation, the local stress at the notch root relaxes, and the stress concentration coefficient decreases accordingly; while, the ratchetting strain concentrates at the notch root and the strain concentration coefficient increases with increasing the number of cycles; The geometrical mean of the stress and strain concentration coefficients gradually increases with the number of cycles, and is significant different from the theoretical stress concentration coefficient. It is indicated that the Neuber rule cannot accurately describe the stress-strain response at the notch root of notched component if obvious ratchetting occurs.
2024, Vol. 45 
