C

Material constant

CFF

Creep-fatigue interaction factor

ECFF

Equivalent creep-fatigue interaction factor

ECFL

Equivalent creep-fatigue life

LMP

Larson Miller parameter

T

Temperature of blade material

$D_{c,i}$

Creep life fraction consumed

$D_{f,i}$

Fatigue damage parameter

$D_{c+f}$

Creep-Fatigue interaction damage parameter

E

Young’s Modulus of the material

$N_f$

Number of stress cycles to failure

$N_{f,i}$

Number of cycles to failure

$N_{f,c+f}$

Number of cycles to creep-fatigue interaction failure

$N_i$

Number of cycles accumulated

$t_f$

Time to creep failure

$t_{f,i}$

creep fracture life at same stress-temperature combination

$t_{f,c+f}$

Time to creep-fatigue interaction failure

$t_{f,c+f\_\mathrm{Re}f}$

Time to creep-fatigue interaction failure at a reference point

$t_i$

Time spent at a given stress-temperature combination

${\epsilon }_f$

True fracture ductility

${\sigma }_a$

Nominal alternating stress amplitude

${\sigma }_u$

Ultimate tensile strength of the material