Relationship between deformation and fracture of metals under low-cycle loading

A study of deformation and damage accumulation processes in 10GN2MFa steel under low-cycle loading

“…The contribution of a strain as one of the key kinematic characteristics of this process is easy to trace in a stress-controlled loading case where the intensity of development of strains, i.e., their growth rate, is fairly high [4]. This enables the material to adapt itself to the loading condition even at an early stage of cycling, which is accompanied by its structural rearrangement with an intensive growth of its damage level and often with its structure attaining an equilibrium state where the rates of hardening and softening are almost equal.…”

“…This enables the material to adapt itself to the loading condition even at an early stage of cycling, which is accompanied by its structural rearrangement with an intensive growth of its damage level and often with its structure attaining an equilibrium state where the rates of hardening and softening are almost equal. Therefore, to allow for the structure fragmentation features at various lifetime stages the cyclic creep life calculations are performed using -in addition to a steady-state creep rate -the instantaneous plastic strain intensity during the first half cycle, which is a particularly important kinematic characteristic of the damage accumulation process under pulsating cycle loading [4,5].…”