Allowable bending moment on a section of pipe loaded by internal pressure and axial force

Abstract

Equations specifying the bending moments which cause yielding of pipe sections loaded by internal pressure and axial force are developed. These expressions are based upon the von Mises yield criterion and include the experimental results from tests of thirty-two pipe specimens. Similar expressions giving the bending moments which cause the pipe sections to collapse under combined loading are also formulated. These relationships are developed for an idealized rigid-plastic material and modification based upon the experimental data are included. The alterations required for agreement between the experimental and theoretical values of bending moment are given in terms of the ratio of the outside diameter of the pipe to the thickness of the pipe wall. The resulting expressions are given in a practical, usable form which facilitates the computation of bending moments that would produce yielding or collapse for a wide range of pipe sizes. Experimental data relating the ovalization of the pipe cross section to the applied loads are included