Modeling of kinetics of corrosion cracking of metals using the long durability theory by A.R. Rzhanitsyn

Abstract

Abstract It has been proposed to model the kinetics of corrosion cracking of metals with the theory of damage accumulation, because corrosion cracking is a process that secretly develops in the material of structures, and the use of an approach based on introducing additional structural parameters (such as the damage parameter) into the number of mechanical variables is justified. An analysis of various models of damage showed that the use of the apparatus of the theory of damage accumulation by Kachanov – Rabotnov to describe the process of corrosion cracking is not effective enough, since in this case the behavior of the material at large stresses and short time intervals is incorrectly described. To simulate corrosion cracking, it is proposed to use the A.R. Rzhanitsyn theory, which defines corrosion cracking as a gradual decrease in the ultimate resistance of a material caused by the influence of a corrosive medium and stress state. Several types of the corrosion cracking equation are considered using the instantaneous strength parameter A.R. Rzhanitsyn, a technique was developed for identifying these equations. A technique is proposed for constructing equations describing the kinetics of the change in instantaneous strength from the information on the corrosion cracking curve obtained from experiment.