Modeling of Environmentally Enhanced Fatigue Crack Growth Response

2 Modeling of Environmentally Enhanced Fatigue Crack Growth Response 

The basic approach to the understanding and prediction of fatigue crack growth response is identical to that for stress corrosion cracking, except that the processes 

If the material is susceptible to stress corrosion cracking (i.e., environmentally affected cracking under sustained loads), a contribution from this mechanism (for applications such as power plant equipment) must be incorporated, and is treated as an additive term. As such  

In essence, for example, (da/dN)cyc might represent the power-on and power-off portion of a power plant s boiler duty cycle, and (da/dN)tm might represent, the steady-state portion of its duty cycle. It is recognized that the crack growth model 

Linkage between corrosion fatigue crack growth response per se and the underlying chemical/electrochemical processes is established through the identification of the extent of surface reaction per cycle 9 with the areal fraction by corrosion fatigue (pc, namely, 

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