Determining local stress and limit load in a thick-walled tube with a hoop direction U-shaped notch under tension

This paper presents, in terms of the spherical section assumption, an effective method for determining the local stress and limit load of a thick-walled tube with an external hoop direction U-shaped notch under tension, and discusses the relationships of the stress concentration factor with notch depth t, radius of the notch root and the internal radius a₁ of the tube. Expressions for the elastoplastic local stress and limit load, which have not been considered by previous workers, are proposed. Comparison of the results of this paper with those of previous work for the case where a₁ = 0 shows that the method of this paper is simple and effective in engineering.