The Effect of Surface Defects Interaction on the Strength of a Pressurised Spherical Shell

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The Effect of Surface Defects Interaction on the Strength of a Pressurised Spherical Shell. / Okulova, D.D.; Sedova, O.S.; Pronina, Yu.G.

In: Procedia Structural Integrity, Vol. 33, 2021, p. 1055-1064.

Research output: Contribution to journal › Conference article

BibTeX

@article{9e138c6cd18a45a58cc41549edb24c68,

title = "The Effect of Surface Defects Interaction on the Strength of a Pressurised Spherical Shell",

abstract = "Spherical pressure vessels are widely used in various industrial processes, for storage and transportation of compressed gases, liquids and other substances. Since most pressure vessels are made of metals, they are often prone to pitting corrosion. To assess and ensure long-term reliability and strength of the structure, it is necessary to analyse stresses concentrated in the vicinity of defects. The present paper focuses on the effect of interaction of neighbouring defects on the stress state of the pressure vessel. А spherical shell with multiple surface defects, under internal pressure is considered. The defects are assumed to have a shape of nearly hemispherical notches of equal sizes with the depth equal to half of its curvature radius. Different numbers of notches with their random arrangement along the equator of the shell are considered. The stress state of the shell is analysed by finite element method using the ANSYS Workbench package. Calculations are made within the frame-work of bilinear plasticity hardening model and linearly elastic model. The effect of the distance between neighbouring defects on the growth of stresses in the vessel for various numbers of random and periodical defects is investigated. The maximum values of stresses were observed in the zones of sharp edges formed between the notches, which slightly overlap or almost touch one another. It is shown that the distance between neighbouring defects is an important but not the only factor affecting the growth of maximum stresses in the pressure vessel weakened by defects.",

keywords = "FEM, Finite element analysis, Pitting corrosion, Pressure vessels, Random distribution, Spherical shell, Stainless steel, Strength, Stress state, Surface defects",

author = "D.D. Okulova and O.S. Sedova and Yu.G. Pronina",

note = "Funding Information: This work was supported by the Russian Science Foundation, grant No 21-19-00100. Publisher Copyright: {\textcopyright} 2021 The Authors. Published by Elsevier B.V.; 26th International Conference on Fracture and Structural Integrity, IGF26 2021 ; Conference date: 26-05-2021 Through 28-05-2021",

year = "2021",

doi = "10.1016/j.prostr.2021.10.117",

language = "English",

volume = "33",

pages = "1055--1064",

journal = "Procedia Structural Integrity",

issn = "2452-3216",

publisher = "Elsevier",

url = "https://www.igf26.eu/igf26",

}

RIS

TY - JOUR

T1 - The Effect of Surface Defects Interaction on the Strength of a Pressurised Spherical Shell

AU - Okulova, D.D.

AU - Sedova, O.S.

AU - Pronina, Yu.G.

N1 - Conference code: 26

PY - 2021

Y1 - 2021

N2 - Spherical pressure vessels are widely used in various industrial processes, for storage and transportation of compressed gases, liquids and other substances. Since most pressure vessels are made of metals, they are often prone to pitting corrosion. To assess and ensure long-term reliability and strength of the structure, it is necessary to analyse stresses concentrated in the vicinity of defects. The present paper focuses on the effect of interaction of neighbouring defects on the stress state of the pressure vessel. А spherical shell with multiple surface defects, under internal pressure is considered. The defects are assumed to have a shape of nearly hemispherical notches of equal sizes with the depth equal to half of its curvature radius. Different numbers of notches with their random arrangement along the equator of the shell are considered. The stress state of the shell is analysed by finite element method using the ANSYS Workbench package. Calculations are made within the frame-work of bilinear plasticity hardening model and linearly elastic model. The effect of the distance between neighbouring defects on the growth of stresses in the vessel for various numbers of random and periodical defects is investigated. The maximum values of stresses were observed in the zones of sharp edges formed between the notches, which slightly overlap or almost touch one another. It is shown that the distance between neighbouring defects is an important but not the only factor affecting the growth of maximum stresses in the pressure vessel weakened by defects.

AB - Spherical pressure vessels are widely used in various industrial processes, for storage and transportation of compressed gases, liquids and other substances. Since most pressure vessels are made of metals, they are often prone to pitting corrosion. To assess and ensure long-term reliability and strength of the structure, it is necessary to analyse stresses concentrated in the vicinity of defects. The present paper focuses on the effect of interaction of neighbouring defects on the stress state of the pressure vessel. А spherical shell with multiple surface defects, under internal pressure is considered. The defects are assumed to have a shape of nearly hemispherical notches of equal sizes with the depth equal to half of its curvature radius. Different numbers of notches with their random arrangement along the equator of the shell are considered. The stress state of the shell is analysed by finite element method using the ANSYS Workbench package. Calculations are made within the frame-work of bilinear plasticity hardening model and linearly elastic model. The effect of the distance between neighbouring defects on the growth of stresses in the vessel for various numbers of random and periodical defects is investigated. The maximum values of stresses were observed in the zones of sharp edges formed between the notches, which slightly overlap or almost touch one another. It is shown that the distance between neighbouring defects is an important but not the only factor affecting the growth of maximum stresses in the pressure vessel weakened by defects.

KW - FEM

KW - Finite element analysis

KW - Pitting corrosion

KW - Pressure vessels

KW - Random distribution

KW - Spherical shell

KW - Stainless steel

KW - Strength

KW - Stress state

KW - Surface defects

UR - http://www.scopus.com/inward/record.url?scp=85120696366&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/e6a3219f-14e2-3bd9-bf07-6f920b395dd0/

U2 - 10.1016/j.prostr.2021.10.117

DO - 10.1016/j.prostr.2021.10.117

M3 - Conference article

AN - SCOPUS:85120696366

VL - 33

SP - 1055

EP - 1064

JO - Procedia Structural Integrity

JF - Procedia Structural Integrity

SN - 2452-3216

T2 - 26th International Conference on Fracture and Structural Integrity, IGF26 2021

Y2 - 26 May 2021 through 28 May 2021

ER -

ID: 88716593