The Theoretical Value for the Tip Radius of Cracks and Notches

Abstract

In this paper, an additional equation that can be used in conjunction with the Stress Intensity Factor is produced, enabling the determination of all critical fracture stresses, including tensile strength, from only one mechanical test data. In this context, the blind elliptical hole stress distribution area equation of Creager and Paris was used and the theoretical radius value was selected to ensure that the maximum principal stress (in MPa) at the tip point and the fracture toughness (in MPa.mm1/2) were equal in value. By using the obtained equation together with the stress intensity factor, the results very close to the experimental data were obtained in the test specimens with cracks and holes, regardless of the true radius of the crack tip.