An equivalent crack growth model for creep fatigue life prediction of metals

摘要: A new creep fatigue life prediction model based on the equivalent crack growth analysis is proposed in this paper. The existing observations propagation and void evolution mechanisms for some metallic materials. Equivalent initial are randomly distributed material their under creepfatigue loadings simulated. Pure rupture testing used to calibrate parameters. Arbitrary strainbased or stress-based creep-fatigue results validation. Experimental data from open literature in-house two metals compared with predictions. General good agreement observed. Some conclusions future work drawn study. Keyword: prediction, creep, fatigue, Nomenclature t = time th during hold ac length Cc parameter related mc N cycle σ stress Δe strain range af Cf mf ai,c size ai,f Thold total ac,c critical ac,f Dc damage fraction Df