Test type Loading rate \(\dot{\text{\ σ}}\) (MPa/s) Duration of peak stress tp (min) Unloading rate \({\dot{\sigma}}^{{}^{\prime}}\) (MPa/s) Unloading rate \({\dot{\sigma}}^{{}^{\prime}}\) (MPa/s) Duration of valley stress tv (min) Duration of valley stress tv (min) Endurance life (h) Endurance life (h) Cycles to failure (Nf)
Static creep 12 infinite - - - 37.2 37.2 - -
Cyclic creep 12 60 0.6 0 0 106.2 106.2 107 107
12 0 0 150.1 150.1 150 150
19 0 0 247.1 247.1 246 246
39 0 0 274.1 274.1 274 274
12 10 10 206.2 206.2 207 207
12 30 30 293.6 293.6 294 294