TY - JOUR

T1 - Interaction of Two Growing Corrosion Pits on the Surface of a Spherical Pressure Vessel

AU - Almazova, L.A.

AU - Sedova, O.S.

AU - Kabritz, S.A.

PY - 2023

Y1 - 2023

N2 - In the paper, two growing corrosion pits on the surface of a spherical pressure vessel are considered. The rate of their growth is supposed to be linearly dependent on the maximum principal stress at their bottom. The effect of different geometrical parameters, including distance between the defects, on the maximum stresses and the pit growth rate is analysed. For the considered parameters, the growth rate of a certain pit is not significantly affected by the presence of the second pitting, even when the distance between them does not exceed their radii. The depth of the pits has hardly noticeable effect on the maximum stresses and the growth rate. A decrease in the radii of the vessel, its thickness being fixed, leads to a reduction in the maximum stresses at the bottom of the pits; the growth rate of the pits also slightly decreases with decreasing radii of the vessel. The distance between the pits affects the stress distribution around the pits: for relatively large distances, pits do not influence each other and the maximum stress is reached at the bottom of the pits, while as the distance decreases, the interaction between pits begins to appear and the maximum stresses are observed at the edge between the pits.

AB - In the paper, two growing corrosion pits on the surface of a spherical pressure vessel are considered. The rate of their growth is supposed to be linearly dependent on the maximum principal stress at their bottom. The effect of different geometrical parameters, including distance between the defects, on the maximum stresses and the pit growth rate is analysed. For the considered parameters, the growth rate of a certain pit is not significantly affected by the presence of the second pitting, even when the distance between them does not exceed their radii. The depth of the pits has hardly noticeable effect on the maximum stresses and the growth rate. A decrease in the radii of the vessel, its thickness being fixed, leads to a reduction in the maximum stresses at the bottom of the pits; the growth rate of the pits also slightly decreases with decreasing radii of the vessel. The distance between the pits affects the stress distribution around the pits: for relatively large distances, pits do not influence each other and the maximum stress is reached at the bottom of the pits, while as the distance decreases, the interaction between pits begins to appear and the maximum stresses are observed at the edge between the pits.

KW - FEM

KW - Finite element analysis

KW - Pitting corrosion

KW - Pressure vessels

KW - Spherical shell

KW - Stainless steel

KW - Stress state

KW - Surface defects

UR - https://www.mendeley.com/catalogue/61482d80-f534-3743-80c9-2b19a23205be/

UR - https://www.mendeley.com/catalogue/61482d80-f534-3743-80c9-2b19a23205be/

U2 - 10.1016/j.prostr.2023.07.083

DO - 10.1016/j.prostr.2023.07.083

M3 - Article

VL - 47

SP - 417

EP - 425

JO - Procedia Structural Integrity

JF - Procedia Structural Integrity

SN - 2452-3216

Y2 - 21 February 2023 through 24 February 2023

ER -