Abstract To address the difficult problems in study of effect average strain on fatigue life under low-cycle loads, materials different cycle ratios was discussed based framework damage mechanics and its irreversible thermodynamics. By introducing Ramberg-Osgood cyclic constitutive equation, a new prediction method intrinsic dissipation theory considering proposed, which revealed correlation be...

The low cycle fatigue response of a single crystal γ′-containing CoNi-base superalloy has been investigated in air and vacuum at 950 °C. performance is demonstrated to be similar the 1st-generation Ni-base AM1. Fracture surface imaging cross-sections on both alloys reveal that oxidation-assisted cracking responsible for crack initiation air. improves under as transitions internal casting pores ...