This paper proposes a unified creep rupture life prediction method based
on continuous damage mechanics under multiaxial stress state. Instead of
the traditional method, this method can calculate the skeletal point
location for different size of notches in a uniform way. We also
conducted creep tests on Ni-based superalloy round bar specimens with
different notch parameters, which verified the accuracy of the method.
Meanwhile, we carried out creep rupture mechanism analysis for different
notch sizes by combining finite element simulation with experiment,
which analyzed the stress, damage, and explained the void growth based
on triaxial stress.