ANALYSIS OF THE STRESS-STRAIN STATE OF THE TANK WALL DURING THE ROLLING PROCESS

The production of tanks by rolling is one of the advanced industrial methods that significantly reduces installation time. At the same time, the walls, bottom and roof of the tank are delivered to the construction site in the form of rolls, which minimizes the amount of welding work on site and improves the quality of welds thanks to factory double-sided automatic welding. However, the presence of a large number of welds, especially in the case of oversized tanks, can lead to stress concentration, which increases the risk of defects and accidents. The rolling process, accompanied by repeated elastoplastic deformation, has a significant effect on the walls of the container, especially in the places of welded joints. The classical calculation of such an effect on the tank walls is difficult, so digital models are used for the study. This article presents a simulation of the stress-strain state of the tank wall, taking into account the rolling process, carried out on a 405x300x2 mm shell sample made of St3sp steel. The choice of St3sp steel, which is a widely used structural carbon steel, is due to its properties suitable for tank operating conditions, such as design pressure, temperature, chemical environment and corrosion resistance. The study focuses on identifying the characteristics of the stress-strain state of the tank wall, resulting from the rolling process, which is crucial for ensuring the safe and efficient operation of the tank throughout its entire service life. The results of the stress-strain state of the tank wall during the rolling process are obtained, which indicate the importance of taking into account residual stresses when calculating the residual life of the tank