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Assessment of Strain in a Corrosive Environment of Structural Steel

  • A. CinithaEmail author
  • P. K. Umesha
  • K. Kesavan
Conference paper
  • 733 Downloads

Abstract

Corrosion damage not only causes structural failure, but also leads to maintenance and repair costs. Improving the effective sensor technology for corrosion detection can reduce the economic loss and provide safe structures with longer service. This paper presents an evaluation technique developed to assess the progressive strain in a corrosive environment using fiber Bragg grating (FBG) sensors. The progress in corrosion process of structural steel coupons under stressed and unstressed condition in a laboratory environment is studied. The strains are measured with electrical resistance strain gauges and FBG sensors and are compared. Strain in coupons under stressed and unstressed condition is measured, and distinct strain behavior is brought out along with reliability of measurements in adverse environment. The central wavelength shift and peak power of FBG are analyzed with interrogator, and the capability of FBG sensor to monitor the progress in corrosion is brought out.

Keywords

Corrosion Fiber Bragg grating sensor Electrolyte Electrical resistance strain gauge 

Nomenclature

n

Effective refractive index of the core

pe

Effective photo-elastic coefficient

Pi.j

Coefficients are the Pockel’s coefficients of the stress-optic tensor

ΔT

Incremental increase in temperature

ΔM

Incremental increase in mass loss

ΔR

Iresistance change in the gauge in ohms

Ro

Original or unstrained gauge resistance

αT

Coefficient of thermal expansion

ε

Unit engineering strain in the specimen surface

ν

Poisson’s ratio

Λ

Grating pitch

Δε

Incremental increase in strain

α, β, γ

Constant coefficients

\(\lambda_{\text{B}}\)

Bragg wavelength

Notes

Acknowledgements

This paper is published with the permission of the Director, CSIR-Structural Engineering Research Centre, Chennai, India.

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Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  1. 1.CSIR-Structural Engineering Research CentreChennaiIndia

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