Abstract
This paper gives a theoretical approach to the general problem of the static fracture resistance in the presence of stress concentrations. First of all, an approaching calculation model is proposed for elastic and plastic stress in the reduced section of a circumferentially notched cylindrical bar. The introduction of a normal stress criterion or of an axial strain fracture criterion on the elastic plastic interface makes it possible to explain the experimental results covering the fracture of various steels above a certain sharpness.
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