In order to clarify whether da/dN depends on cycle only, or on time only or on both cycle and time, crack growth behavior, 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 t//R and stress hold time t//H independently. From the results and the analysis, a new experimental formula was obtained for da/dN in nonlinear terms of f, t//r and t//H. 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 (t//H equals 0 s) was proposed in terms of frequency.
|Number of pages||9|
|Journal||Nippon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A|
|Publication status||Published - 1987 Aug|
ASJC Scopus subject areas
- Mechanical Engineering