What causes Corrosion Fatigue? Corrosion Fatigue is caused
by crack development under the simultaneous action of
corrosion and cyclic stress. The usual case involves
stresses that may be well below " 100- the tensile strength.
As stress is increased, the number of cycles required to
cause fracture decreases.As in the case of stress corrosion
cracking, corrosion fatigue is dependent on the interactions
among loading, environmental, and metallurgical factors. For
a given material, the fatigue strength (or fatigue life at a
given maximum stress value) generally decreases in the
presence of an aggressive environment. For the majority of
engineering alloys, the fatigue limit refers to the stress
level below which failure does not occur within a specified
number of cycles, usually 107 or 10% cycles, as shown in the
S-N plot.
