Analysis of crack behavior caused by corrosion in metal vessel repaired with composite under monotonic loading

The presence of cracks in fuel vessels and pipelines against intermittent loads will cause them to grow in the damaged area and cause problems in the fuel transfer process. Using composite fibers to repair the damaged area can increase the life of the structure and part and prevent further damage during unloading and refueling. In this research, a steel tank is subjected to monotonic loading with an increase rate of 1 MPa per minute. The main material of these types of structures is API 5L X65 steel, and the repair conditions are made according to ISO24817 and ASME PCC-2 standards. Numerical analysis of these structures according to the type of defect in it and comparing it with the repaired tank can predict the optimal working conditions. Also, the presence of cracks in this type of tank due to the type of corrosion will cause a lot of stress concentration and change their shape. Using composite fibers and spacers will reduce the stress level and prevent the growth of cracks caused by corrosion. Among the advantages of repairing with the help of composite fibers are the non-interruption of fluid flow inside the pipe during the repair, easy installation, reduced costs, and improved safety. Therefore, this method reduces the stress concentration in the corrosion area.