approach described
is implemented in the software tool SARA, adding sets of
necessary material data, i.e. cyclic stress-strain behavior, creep behavior, creep rupture behavior, fatigue life
curve and fatigue life curve with the Smith-Watson-Topper parameter (factor vσ in eq. (2)) for some heat
resistant steels. The software tool was developed to study the influence of temperature, total strain range, strain
rate, and hold time on number of cycles to crack initiation.
In order to determine critical values Lcrit for the three heat resistant steels above, a significant number of
long term creep fatigue experiments were applied to the left hand side of eq. (1). As a result, mean values for
the critical creep fatigue damage Dcrit were determined