Limit Load Analysis of Elbow with Local Wall Thinning under Combined Loads

Abstract

The local wall thinning(LWT) is a kind of common volume defect in pressure pipe. The limit loads of elbows with LWT under pressure, bending moment, torque and their combined loads have been studied in detail by orthogonal experimental design and finite element method. The results have shown that the influence of depth and circumferential length of LWT on the limit load is more obvious compared to that of axial length when an elbow is under pressure, bending moment or torque. The change of limit bending moment and torque with the depth of LWT and circumferential length is significant for an elbow under combined bending moment and torque. At last, the safety assessment equations for elbow under combined in-plane closing bending moment and torque were proposed by regression analysis.

A design method for half‐pipe jacketed vessels based on numerical limit‐load analysis

“…Limit-load analysis is a method of design-by-analysis for design of pressure vessels. [13][14][15][16][17][18] To determine the limit-load, non-linear analysis should be carried out to find the maximum convergent pressure, that is, the limit-load.…”

Finite Element Analysis of the Limit Load of Straight Pipes with Local Wall-Thinning Defects under Complex Loads

“…Zhao [20] analyzed the influence of different corrosion defect parameters and material parameters on the limit internal pressure of pipelines with defects under compressive axial force and axial tensile force via the nonlinear finite element method. Cui [21] studied the influence of torque and bending moment on the limit internal pressure of pipelines with local wall-thinning defects. Mondal [22] specifically determined the influence of the compressive axial force and bending moment on the limit pressure of corroded pipelines.…”