Research on low cycle fatigue life prediction considering average strain

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 between , material properties, strain. Through analysis test data five metal materials, model parameters corresponding were obtained. The calculation results indicate that proposed is good agreement with test, reasonable characterization influence realized. Comparing calculations three typical models, within two times error band, significantly better than existing more suitable for prediction. critical region power provides idea research metallic materials.