Electrochemical Reaction-Controlled Fatigue Crack Growth

6 Electrochemical Reaction-Controlled Fatigue Crack Growth 

For electrochemical reaction controlled fatigue crack growth, the dependence is explicitly given by Eqn. (9.10) specifically, by the second part namely. 

The cause for this difference may be seen clearly through a comparison of the functional dependence on reaction rate constant between sustained-load (stress corrosion cracking, SCC) and fatigue (corrosion fatigue, CF) crack growth. 

The responses reflect the respective functional dependence on the reaction rate constant ko. For see, decreases in ko lead to direct reductions in Stage II crack growth rates (see Fig. 9.23). For eF, on the other hand, because the dependence on ko is embedded in the exponential term, it change is reflected in the Ffrequency domain (see Fig. 9.24). 

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