INFLUENCE OF TEMPERATURE ON FATIGUE CREEP INTERACTION FRACTURE MAP

The relative ratio of fatigue resistance to creep resistance of materials varies with test temper-ature.As the temperature decreases,the creep resistance,since it is a thermal activation pro-cess,becomes relatively larger than fatigue resistance.Therefore the fatigue damage becomespredominant,and results in expansion of fatigue fracture region(region F),and shrinkageeven complete elimination of creep fracture region(region C).A materials parameter Ω canbe defined to estimate the temperature at which the creep fracture region is completely de-pressed.This phenomenon could be understood on the basis of the integrated model of compet-itive and cumulative models of fatigue creep interaction.