Abstract
Bending low cycle fatigue tests were carried out on the specimens with a blind hole of an annealed 0.45%C steel in SEM. COD was measured by SEM photographs. The small-crack growth law was discussed based on COD. The main results obtained are as follows : (1) When strain level is constant, the shapes of the rims of cracks are geometrically similar to each other and the crack opening ratio, U, is nearly constant. (2) When dl/dN in several specimens are equal, COD near the crack tip are also nearly equal. (3) The phenomena mentioned above support the small-crack growth law dl/dN∝l.
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