Plastic limit load of ellipsoidal pressure vessel head with nozzle under internal pressure loading

Abstract

A new method and numerical procedure for determining the plastic limit load in an ellipsoid-cylinder intersection using the elastic-plastic finite element analysis are presented. The proposed method is based on the maximum criterion of the rate of change of the relative plastic work. For the elastic-plastic analysis of the nozzle connections the 2D finite element method and plasticity theory with strain hardening are used. The results of the comparison of the plastic limit pressure obtained on the basis of different known criteria and the proposed criterion are presented. A parametric study of ellipsoidal heads with a nozzle under internal pressure loading was performed. The effects of nondimensional geometric parameters of shell intersection on the plastic limit pressure are discussed.

Possible consequences of nonstationary loads on the durability of welded joints for low-alloy steel fittings

“…Calculation of equivalent stress in the node of intersection of thin-walled shells by the finite element method (FEM) is the most commonly mentioned in literature sources. However, many researchers propose to apply the FEM under stationary conditions: either the effect of excess pressure or temperature in the apparatus [28][29][30][31]. The main and not very simple aim of such studies is to calculate the strength of shells under the simultaneous influence of various conditions in the areas where stress concentrators appear.…”

Finite Element Analysis of Stress for Nozzle Zone at Channel of Pressure Vessel

“…Pressure vessel is widely used in many field of industry, such as chemical and petroleum industry, nuclear and power engineering, gas, oil and oil-refining industries, aerospace technique [1]. With the improvement of manufacturing technology, higher requirements are introduced for pressure vessel.…”