Predictions of the creep rupture lifetime under constant uniaxial tensile load according to various theories are compared. Both purely ductile and purely brittle rupture mechanisms are included as well as some recently proposed combined mechanisms of failure.
One of these latter mechanisms is shown to yield results which describe quite well the dependence of the creep rupture lifetime on load in the entire region from instantaneous, usually rather ductile, rupture at high loads to long delayed, usually rather brittle, creep rupture at smaller loads.
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