Abstract
The corrosion fatigue crack initiation life is not affected independently by each stress rising time tR and stress holding time tH, but by the sum of the tR and tH, that is, by stress frequency, f=1/(2tR+tH), On the other hand, the corrosion fatigue crack propagation life is influenced independently by tR and tH. The tH characteristics shows the transition behaviour from the cyclic dependent mechanism into the time dependent mechanism. The crack propagation life occupies major part of fracture life. The fracture life law diagram plotted by the fracture time t and fracture cycles N, as normalized stress corrosion life tscc, and corrosion fatigue life (cycles) NCF(tH=0), respectively, shows approximately the same curve with repect to the parameter tR.
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