Variable creep load is one of the most important failure modes for
hot-component of aero-engine. To accurately predict creep damage and
remaining life, a novel nonlinear creep damage accumulation model is
proposed based on the Wilshire function and isodamage line, which takes
the influence of load history into account and uses ultimate tension
strength to compensate the temperature effect. Experimental result of
tests on four kinds of material were utilized to verify the accuracy of
the proposed model and to compare it with existing models. It was
determined that the novel model was better at predicting damage
accumulation than all others model. Furthermore, the proposed model
elucidates the evolutionary process of creep damage, and four cases of
damage evolution process are discussed.