The role of corrosion pit topography on stress concentration

Tamsin Dobson; Nicolas Larrosa; Harry Coules

doi:10.1016/j.engfailanal.2023.107900

The role of corrosion pit topography on stress concentration

Tamsin Dobson^*
, Nicolas Larrosa
, Harry Coules

^*Corresponding author for this work

University of Bristol

Research output: Contribution to journal › Article › peer-review

20 Citations (Scopus)

Abstract

Smooth semi-ellipsoids are typically used to simulate the effect of corrosion pits on stress, however, this does not account for pit geometry. Three corrosion pits were identified on Nickel Aluminium Bronze samples. These were scanned and converted to finite element models. The linear elastic stress concentration factor (K_t) of the corrosion pit FE models was 1.32–1.65 times larger than for an equivalent smooth semi-ellipsoid. This suggests that detailed consideration of pit geometry is needed to calculate accurate values of K_t and the assumption of a semi-ellipsoidal pit may not be conservative for fatigue lifetime predictions of pitted components.

Original language	English
Article number	107900
Journal	Engineering Failure Analysis
Volume	157
DOIs	https://doi.org/10.1016/j.engfailanal.2023.107900
Publication status	Published - Mar 2024
Externally published	Yes

Keywords

Corrosion
Finite elements analysis
Marine component
Mechanical engineering
Nickel Aluminium Bronze
Preventative maintenance based on predictive modelling
Stress corrosion cracking

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10.1016/j.engfailanal.2023.107900

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title = "The role of corrosion pit topography on stress concentration",

abstract = "Smooth semi-ellipsoids are typically used to simulate the effect of corrosion pits on stress, however, this does not account for pit geometry. Three corrosion pits were identified on Nickel Aluminium Bronze samples. These were scanned and converted to finite element models. The linear elastic stress concentration factor (Kt) of the corrosion pit FE models was 1.32–1.65 times larger than for an equivalent smooth semi-ellipsoid. This suggests that detailed consideration of pit geometry is needed to calculate accurate values of Kt and the assumption of a semi-ellipsoidal pit may not be conservative for fatigue lifetime predictions of pitted components.",

keywords = "Corrosion, Finite elements analysis, Marine component, Mechanical engineering, Nickel Aluminium Bronze, Preventative maintenance based on predictive modelling, Stress corrosion cracking",

author = "Tamsin Dobson and Nicolas Larrosa and Harry Coules",

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year = "2024",

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doi = "10.1016/j.engfailanal.2023.107900",

language = "English",

volume = "157",

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T1 - The role of corrosion pit topography on stress concentration

AU - Dobson, Tamsin

AU - Larrosa, Nicolas

AU - Coules, Harry

PY - 2024/3

Y1 - 2024/3

N2 - Smooth semi-ellipsoids are typically used to simulate the effect of corrosion pits on stress, however, this does not account for pit geometry. Three corrosion pits were identified on Nickel Aluminium Bronze samples. These were scanned and converted to finite element models. The linear elastic stress concentration factor (Kt) of the corrosion pit FE models was 1.32–1.65 times larger than for an equivalent smooth semi-ellipsoid. This suggests that detailed consideration of pit geometry is needed to calculate accurate values of Kt and the assumption of a semi-ellipsoidal pit may not be conservative for fatigue lifetime predictions of pitted components.

AB - Smooth semi-ellipsoids are typically used to simulate the effect of corrosion pits on stress, however, this does not account for pit geometry. Three corrosion pits were identified on Nickel Aluminium Bronze samples. These were scanned and converted to finite element models. The linear elastic stress concentration factor (Kt) of the corrosion pit FE models was 1.32–1.65 times larger than for an equivalent smooth semi-ellipsoid. This suggests that detailed consideration of pit geometry is needed to calculate accurate values of Kt and the assumption of a semi-ellipsoidal pit may not be conservative for fatigue lifetime predictions of pitted components.

KW - Corrosion

KW - Finite elements analysis

KW - Marine component

KW - Mechanical engineering

KW - Nickel Aluminium Bronze

KW - Preventative maintenance based on predictive modelling

KW - Stress corrosion cracking

UR - https://www.scopus.com/pages/publications/85181056404

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DO - 10.1016/j.engfailanal.2023.107900

M3 - Article

AN - SCOPUS:85181056404

SN - 1350-6307

VL - 157

JO - Engineering Failure Analysis

JF - Engineering Failure Analysis

M1 - 107900

ER -

The role of corrosion pit topography on stress concentration

Abstract

Keywords

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