Abstract
The strain range partitioning (SRP) method was developed as an aid to fatigue lifetime prediction and works on the assumption that inelastic strain can be divided into two different types of strain, viz. plasticity and creep. The effects of creep depend upon where in the cycle it occurs and whether it is reversed by plasticity or creep. In practice the SRP method is seldom used because of the large amount of experimental data required to determine the basic relationships and methods which can be applied directly to a fatigue loop with a hold-time (for example, with the incorporation of a frequency factor) are more often preferred. However, the SRP method is well suited to describing types of strain occurring in fatigue at varying temperatures as shown by the examples of bithermal fatigue.
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