Elastic-plastic stress-strain calculation at notch root under monotonic, uniaxial and multiaxial loadings

The equivalent strain energy density (ESED) method was originally suggested and is still widely used to calculate the stresses and strains at notch root. It is well recognized, however, that the ESED method tends to underestimate the notch-tip stresses and strains. In order to obtain better predictions, in the present paper, a factor ((1 + v(e))/(1 + v(eff))) was introduced to modify the dissipated heat energy contained in the ESED method. A computational modeling technique coupling with Jiang-Sehitoglu plasticity model was also developed to calculate the multiaxial elastic-plastic notch-tip stress-strain responses of notched components. Extensive validations of the proposed method show that the calculated stresses and strains are in accord with experimental data and show reasonable accuracy. (C) 2017 Elsevier Ltd. All rights reserved.