ESTIMATION OF THE STRESSED-DEFORMED STATE OF DIMPLE ZONES IN THE WALL OF THE VERTICAL CYLINDRICAL TANK

In this article the estimation issue of the stressed-deformed state of dimple zones in the wall of the vertical cylindrical tank for oil and oil products is considered. The technique of experiments on the model of tank wall fragment with dimple and research results of the stressed-deformed state of dimple zones is described. The experimental dependences of stress-concentration factor on the dimple sizes are established. Results of numerical investigation of the stressed-deformed state of dimple zones at various values of non-dimensional parameters describing a dimple in the wall are discussed: non-dimensional depth  and non-dimensional radius  of dimple. Theoretical dependences of stress-concentration factor in dimple zone on the above-stated non-dimensional parameters are obtained. The research results prove the need of the account for calculations of stress-concentration for a dimple zone and method development for calculation of strength and endurance capability of tanks.