Abstract
Using the relationship between strain and thickness from the materials theory, this paper presents further development of the atmospheric corrosion sensor based on strain measurement (ACSSM). Fiber Bragg grating (FBG) sensors were used to measure strain in this study. The active–dummy method was employed to compensate the effects of environmental temperature drift, with the configuration and position of the active–dummy FBG sensors determined based on simulations conducted using the finite element method (FEM). Hence, the reduction in thickness of low-carbon steel test pieces could be isolated, ensuring accurate characterization of this parameter. Results of practical galvanostatic electrolysis experiments conducted with the FBG sensors in the proposed configuration demonstrated accurate measurement of the reduction in the thickness of a test piece, suggesting that an ACSSM with active–dummy FBG sensors would be appropriate for monitoring of atmospheric corrosion in steel structures.
Highlights
Since corrosion is the main failure mode for steel structures, sensors that can predict their corrosion rate are very important in structural health monitoring for evaluating safety levels [1]
We proposed an improvement to the atmospheric corrosion sensor based on strain measurement (ACSSM)
We observed that Δε, the difference between the outputs of Conclusions the active and the dummy Fiber Bragg grating (FBG) sensors, is less sensitive to changes to the experimental environment, enabling the collection of more accurate and constant signals less affected by
Summary
Since corrosion is the main failure mode for steel structures, sensors that can predict their corrosion rate are very important in structural health monitoring for evaluating safety levels [1]. The mechanical principles of the changes to elastic strain due to reductions in thickness produced by corrosion were. To accurately evaluate the reduction in the thickness of the test piece, the configuration and install positions of the active and dummy FBG sensors were determined through FEM analysis of the effect of temperature on the strain measurement. The operating principle of the ACSSM technique is the measurement of the reduction in thickness of a test piece using the mechanical theory of deformation. The operation of the FBG strain sensor is based on the measurement of the shift in the Bragg wavelength, which is caused by changes in strain, temperature, and other external influences.
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