Abstract

In order to clarify whether da/dN depends on cycle only, or on time only or on both cycle and time, crack growth behaviour, in a 3.5% NaCl solution, of low alloy Cr-Mo steel at a lower frequency range was experimentally studied, stress frequency f being controlled by stress rise time tR and tress hold time tH independently. From the results and the analysis, a new experimental formula was obtained for da/dN in non-linear terms of f, tR and tH. A stochastic process concept is proposed for the significance of the equation of this type. As a special case, a simple and convenient expression for da/dN and da/dt in corrosion fatigue (tH =0 s) was proposed in terms of frequency.

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