Effect of Corroded Surface Morphology on Ultra-Low Cycle Fatigue of Steel Bridge Piers

Corrosion is a common form of durability degradation of steel bridges. Corrosion morphology affects stress distribution under cyclic loads and causes strain concentrations in pits, thus affecting the mechanical properties of steel structures, including ultra-low cycle fatigue (ULCF). To precisely si...

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Main Authors: Fangyuan Song, Tingting Zhang, Xu Xie
Format: Article
Language:English
Published: MDPI AG 2021-02-01
Series:Materials
Subjects:
Online Access:https://www.mdpi.com/1996-1944/14/3/666
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author Fangyuan Song
Tingting Zhang
Xu Xie
author_facet Fangyuan Song
Tingting Zhang
Xu Xie
author_sort Fangyuan Song
collection DOAJ
description Corrosion is a common form of durability degradation of steel bridges. Corrosion morphology affects stress distribution under cyclic loads and causes strain concentrations in pits, thus affecting the mechanical properties of steel structures, including ultra-low cycle fatigue (ULCF). To precisely simulate corrosion morphology and investigate the ULCF failure mechanism of corroded steel piers, a sculpting method was applied to mesh units using three-dimensional surface morphology data of corroded steel specimens. Moreover, the ULCF crack-initiation life was numerically predicted using the finite element model based on the cyclic void growth model (CVGM). The cumulative equivalent plastic strain, cyclic void growth index, and critical void growth index of corroded steel piers with different corroded morphologies were compared. Results reveal that, regardless of whether the pier is corroded, fatigue cracks tend to initiate at the weld toe at corners when exposed to cyclic loads under an oblique direction at the pier top. Additionally, the ULCF crack-initiation life in a corroded pier is less than that in an uncorroded pier, and it is significantly affected by a reduction in the pier wall thickness. Corrosion pits affect the position of ULCF crack initiation in a steel pier and cracks tend to initiate at the bottom of pits with large depth-to-diameter ratios. In the case of minor corrosion, the corrosion morphology affects the seismic performance of piers to a small extent.
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spelling doaj.art-ed6d25e6e0434c148a2c8070b2f6f7412023-12-03T11:56:51ZengMDPI AGMaterials1996-19442021-02-0114366610.3390/ma14030666Effect of Corroded Surface Morphology on Ultra-Low Cycle Fatigue of Steel Bridge PiersFangyuan Song0Tingting Zhang1Xu Xie2College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, ChinaCollege of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, ChinaCollege of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, ChinaCorrosion is a common form of durability degradation of steel bridges. Corrosion morphology affects stress distribution under cyclic loads and causes strain concentrations in pits, thus affecting the mechanical properties of steel structures, including ultra-low cycle fatigue (ULCF). To precisely simulate corrosion morphology and investigate the ULCF failure mechanism of corroded steel piers, a sculpting method was applied to mesh units using three-dimensional surface morphology data of corroded steel specimens. Moreover, the ULCF crack-initiation life was numerically predicted using the finite element model based on the cyclic void growth model (CVGM). The cumulative equivalent plastic strain, cyclic void growth index, and critical void growth index of corroded steel piers with different corroded morphologies were compared. Results reveal that, regardless of whether the pier is corroded, fatigue cracks tend to initiate at the weld toe at corners when exposed to cyclic loads under an oblique direction at the pier top. Additionally, the ULCF crack-initiation life in a corroded pier is less than that in an uncorroded pier, and it is significantly affected by a reduction in the pier wall thickness. Corrosion pits affect the position of ULCF crack initiation in a steel pier and cracks tend to initiate at the bottom of pits with large depth-to-diameter ratios. In the case of minor corrosion, the corrosion morphology affects the seismic performance of piers to a small extent.https://www.mdpi.com/1996-1944/14/3/666seismic design of steel bridgecyclic void growth modelsteel corrosioncorrosion morphologyultra-low cycle fatiguefinite element model
spellingShingle Fangyuan Song
Tingting Zhang
Xu Xie
Effect of Corroded Surface Morphology on Ultra-Low Cycle Fatigue of Steel Bridge Piers
Materials
seismic design of steel bridge
cyclic void growth model
steel corrosion
corrosion morphology
ultra-low cycle fatigue
finite element model
title Effect of Corroded Surface Morphology on Ultra-Low Cycle Fatigue of Steel Bridge Piers
title_full Effect of Corroded Surface Morphology on Ultra-Low Cycle Fatigue of Steel Bridge Piers
title_fullStr Effect of Corroded Surface Morphology on Ultra-Low Cycle Fatigue of Steel Bridge Piers
title_full_unstemmed Effect of Corroded Surface Morphology on Ultra-Low Cycle Fatigue of Steel Bridge Piers
title_short Effect of Corroded Surface Morphology on Ultra-Low Cycle Fatigue of Steel Bridge Piers
title_sort effect of corroded surface morphology on ultra low cycle fatigue of steel bridge piers
topic seismic design of steel bridge
cyclic void growth model
steel corrosion
corrosion morphology
ultra-low cycle fatigue
finite element model
url https://www.mdpi.com/1996-1944/14/3/666
work_keys_str_mv AT fangyuansong effectofcorrodedsurfacemorphologyonultralowcyclefatigueofsteelbridgepiers
AT tingtingzhang effectofcorrodedsurfacemorphologyonultralowcyclefatigueofsteelbridgepiers
AT xuxie effectofcorrodedsurfacemorphologyonultralowcyclefatigueofsteelbridgepiers