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Experimental and analytical study on fatigue strength and stress concentration of corroded bridge wires

Experimental and analytical study on fatigue strength and stress concentration of corroded bridge... Fatigue tests were conducted for corroded galvanized steel wires on three corrosion levels, showing that fatigue strength of corroded wires lowers as corrosion progresses. Deeper and severer corrosion pits seem to form in more condensed areas. Fatigue tests were then conducted for wire specimens with artificial pits whose sizes were decided by the measured corrosion pit data. Three different pit shapes were assumed: round, triangle and triangle with a notch. Fatigue strength of wires with triangle pit was lower than that with a round shape. Fatigue strength of wires with notched triangle further decreased. The pit shape seems to be a dominant factor to lower fatigue strength. Stress concentration factor at the sharp edge of pits were obtained by strain gauge measurement and 3D FEM analysis. Both methods showed that strain was almost same value and stress concentration is larger for sharper pit shapes, indicating that this is the major cause for decrease of fatigue strength. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Bridge Structures IOS Press

Experimental and analytical study on fatigue strength and stress concentration of corroded bridge wires

Miyachi, K.; Nakamura, S.
Bridge Structures , Volume 12 (1-2): 11 – Jan 1, 2016
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Publisher
IOS Press
Copyright
Copyright © 2016 IOS Press and the authors. All rights reserved
ISSN
1573-2487
eISSN
1744-8999
DOI
10.3233/BRS-160101
Publisher site
See Article on Publisher Site

Abstract

Fatigue tests were conducted for corroded galvanized steel wires on three corrosion levels, showing that fatigue strength of corroded wires lowers as corrosion progresses. Deeper and severer corrosion pits seem to form in more condensed areas. Fatigue tests were then conducted for wire specimens with artificial pits whose sizes were decided by the measured corrosion pit data. Three different pit shapes were assumed: round, triangle and triangle with a notch. Fatigue strength of wires with triangle pit was lower than that with a round shape. Fatigue strength of wires with notched triangle further decreased. The pit shape seems to be a dominant factor to lower fatigue strength. Stress concentration factor at the sharp edge of pits were obtained by strain gauge measurement and 3D FEM analysis. Both methods showed that strain was almost same value and stress concentration is larger for sharper pit shapes, indicating that this is the major cause for decrease of fatigue strength.

Journal

Bridge Structures – IOS Press

Published: Jan 1, 2016

References

  • Conditions of suspension bridge cables: The New York city case study
    Betti
  • Corrosion mechanism and new protection methods of suspension bridge cables
    Furuya
  • Corrosion and embrittlement in high-strength wires of suspension bridge cables
    Betti
  • Mechanical properties and remaining strength of corroded bridge wires
    Nakamura
  • Fracture strength for a high strength steel bridge cable wire with a surface crack
    Mahmoud
  • Cracking and fracture of suspension bridge wires
    Mayrbaurl
  • Environmental factors affecting corrosion of galvanized steel wires
    Suzumura
  • Hydrogen embrittlement and corrosion fatigue of corroded bridge wires
    Nakamura