A phenomenological life evaluation method for corrosion fatigue

Abstract

Considering interacted damage accumulations induced by corrosion, cyclic fatigue, and stress corrosion cracking, a phenomenological corrosion fatigue (CF) life evaluation formula has been proposed. A concept of nominal CF limit has been introduced, which indicates whether cyclic damage accumulation is active or not. It is found that cyclic fatigue damage accumulation enhanced by corrosion is the dominative damage under relatively high stress amplitudes (compared to the nominal limit), whereas, under low stress amplitudes, corrosion damage accumulation would become the dominative one. Stress amplitudes below the nominal fatigue limit would lead to CF too due to corrosion damage accumulation, which can finally make the effective amplitude larger than nominal limit. Once the parameters included in formula have been determined by uniaxial tests, CF life under any complicated stress state could be estimated in a unified way.

Experiment and simulation of high‐cycle corrosion fatigue damage evolution and corrosion pit tolerance analysis of crack nucleation

“…However, even the effective stress is far lower than σ th , corrosion environment also can accelerate the fatigue failure of the specimen. To cover this fact, a corrosion damage model for smooth materials was proposed in which the enhancing effect of stress on corrosion damage can be written as [25] dD dt corrosion…”

“…However, even the effective stress is far lower than σ th , corrosion environment also can accelerate the fatigue failure of the specimen. To cover this fact, a corrosion damage model for smooth materials was proposed in which the enhancing effect of stress on corrosion damage can be written as [ 25 ] where σ 0 is the average stress ( σ 0 ≥ 0) and c 0 , c 1 , β , and m are constants related to the material and corrosive environment.…”

“…Hou and Xu presented a conceptual corrosion fatigue life assessment method in which the damage accumulation caused by the interaction from corrosion, cyclic loading. and stress corrosion was considered [ 25 ] . Sun [ 26 ] established a corrosion fatigue damage model of high‐strength bridge cable steel and developed the finite element (FE) algorithm to simulate the corrosion fatigue process.…”