Modeling of corrosion-mechanical behavior of composition rotation shells in a temperature field

Abstract

In the process of exploitation, vessels and apparatuses of chemical productions can be subjected to the joint action of long-acting loads, temperatures, and corrosive working media. Real vessels and apparatuses are a combination of shells of rotation of various configurations: cone, torus, sphere, cylinder, etc. When calculating, one should take into account the edge effect at the points of inflection of the guide. Many vessels and apparatuses of chemical engineering work in uneven thermal and power fields, which cause local corrosion. The article considers the problem of calculating geometrically and physically nonlinear composite shells of revolution subjected to corrosion wear in an inhomogeneous temperature field, and the corrosion rate depends on both the stress state and temperature. Equations are obtained that describe the corrosion-mechanical behavior of shells of revolution, taking into account corrosion wear in force and thermal fields. The stress-strain state of the shell of rotation is studied by the method of successive perturbations of the parameters (in this case, time), and the time step value is selected from the condition of satisfying the required accuracy of solving the problem. At each time step, the method of initial parameters with orthogonalization of S. K. Godunov solves the boundary-value problem for a system of resolving equations with the corresponding boundary conditions. The results of calculating an autoclave, which is a combined shell of revolution: a sphere - a spherical torus - a cylinder, are presented.