Finite element analysis of stress concentration coefficient of internal pressure conical shell

Abstract

Based on the analysis and design idea, we use the finite element method to evaluate the dangerous position of the conical shell opening structure, select the stress concentration coefficient of the opening as the research object, analyze the influence of different opening angle and with/withput a connecting pipe on it, and seeks the optimal design of the conical shell opening. The results show that the nozzle has a certain weakening effect on the stress concentration of the opening, and when the opening angle (the angle between the center line of the opening and the generatrix of the conical shell) is around 90° , the nozzle has a more significant strengthening effect on the structure. It also shows when the opening rate is fixed, the stress concentration coefficient of the opening decreases first and then increases with the increase of the opening angle, and when the opening angle is in the range of 80 ° to 110 ° , the stress concentration coefficient is the smallest between 2 to 3.