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.
In order to accurately predict creep deformation and damage evolution of nickel-based superalloy GH4169, a novel damage constitutive model, that is, TTC CDM-based model, was proposed based on TTC relations and continuum damage mechanics (CDM). This model combined the best features of the TTC relations and CDM. The recently developed TTC relations were intrinsic relations between threshold stress, tensile properties, and creep behavior and exhibited better prediction ability than Wilshire equations. It was determined that the model accurately predicted the minimum creep rate, rupture time, creep deformation, and damage evolution process of GH4169. Microstructural study has revealed that the creep fracture mode gradually converts from intergranular brittle fracture to transgranular ductile fracture as the stress decreases. Furthermore, the nonlinear creep damage accumulation effect was also revealed by the novel model.
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