Abstract
The effects of overload on the fatigue slrength and threshold siress intensity factor range (ΔK_<th>) of SUS316 were studied. Tensile or compressive overload were applied to the bending fatigue test specimens with a small crack-like surface defect and fatigue tests were carried out to detenriine the fatigue limit and ΔK_<th>. It was found that the ΔK_<th> increased by tensile overloading. The increasing rate of ΔK_<th> in the CT specimen is larger than that in the bending fatigue test specimen. Thus, the crack size effects on the improvement of ΔK_<th> after overloading were observed. The results are discussed from the viewpoint of fracture mechanics.
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