Modified Strain range Partitioning Method

According to the character that for the high strength,low ductility alloys,the inelastic strains is small and difficult to determine,a modified method of Strain Range Partitioning (SRP) was presented.Plasticity and creep are not partitioned,and three basic kinds of inelastic strain ranges are defined in the modified SRP as follows:tensile plasticity-compressive plasticity was designated as pp inelastic strain range,tensile plasticity and creep-compressive plasticity was designated as cp inelastic strain range and tensile plasticity-compressive plasticity and creep was designated as pc inelastic strain range.The linear damage rule was applied to predict the life of cc type cycle that contains both tensile creep and compressive creep.The modified SRP was evaluated for its ability to predict creep-fatigue behavior of thermomechanically processed advanced nickel-base superalloy used for turbine disks,Rene’95,at 650℃.The result indicates that the predictive ability of the modified SRP is better than SRP, and the prediction of the is mostly within a scatter band of 2 compared to the baseline test data.