Upper bounds on the creep rupture life of structures subjected to variable load and temperature

Upper bounds on the rupture life and time to initial rupture of a body obeying the Katchanov creep rupture equations are derived for cyclic load and temperature. The bounds are derived from the creep rupture equation without reference to the deformation properties. The relationship to previously derived bounds of this type are discussed, and the circumstances when the bounds can be both very good and very poor are demonstrated through simple examples.