Exfoliation Corrosion and Pitting Corrosion and Their Role in Fatigue Predictive Modeling: State-of-the-Art Review

Table 1

Phases of Life. See Figure 1. {from Hoeppner, 1972 [67], 1981 [38], 1985 [39]}.

(i) Formation or nucleation of degradation/damage by a specificphysical or corrosion process interacting with the fatigue processif appropriate. Corrosion and other processes may act alone toform/nucleate the damage. A transition from theformation/nucleation stage to the next phase must occur. Phase L1 to some other phase.
(ii) Microstructurally dominated crack linkup and propagation (“short” or “small” crack regime). Phase L2.
(iii) Crack propagation in the regime where LEFM, EPFM, or FPFM may be applied both for analysis and material characterization (the “long” crack regime). Phase L3.
(iv) Final instability. Phase L4.

NOTE: In some cases in practice not all the phases cited above occur.