Abstract
This paper describes the effects of stress ratio on the ΔKth improvment by overload. Tensile overload was applied to compact tension specimen, subsequently fatigue tests were carried out at stress ratio S= 0.1 or 0.5. And an analytical investigation of effect of stress ratio was studied. The value of ΔKth increased with increasing of the tensile overload . And the nominal threshold values were given by the equation: ΔNKths=C + DKov. Where C is ΔKtho and D is a proportional constant and 0.26-0.28. Experimental results showed that D showed good agreement with theory. Thus, if ΔNKths is enough larger than applied K and ΔK values, crack is not able to grow and can be made harmless.
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