This paper presents an investigation on strong-acid relations between corrosion rate and corrosion time in 30 studs, dipped into 36% industrial hydrochloric acid through 0.5 h, 1 h, 2 h, 4 h, 8 h, 12 h, 24 h, 48 h, and 72 h, respectively. These corroded studs are performed tensile tests to study failure mode and stress-strain curves in studs with different corrosion time. Thereafter, a 3-D finite element is established through computer program to validate test results, and then analyze mechanical properties along with failure mode of studs exposed to strong-acid corrosion. The analysis results show that the failure mode gradually changes from ductile-damage state to brittle-damage state. The corrosion rates present a non-linear elevation with an increase of strong-acid-corrosion time. The nominal yield strength, the nominal ultimate strength, and the elongation in the corroded studs exhibit a fast-downward trend when increasing corrosion time. However, the degradation of elastic modulus turn into a slow step and the yield strength ratio in studs tends to be steady. The J-C model (Johnson-Cook Constitutive) with updated coefficients can be applied to reflect the constitutive relations in studs after strong-acid corrosion under quasi-static tension conditions. Further, this model can simulate stress flows within studs after strong-acid corrosion. This research results can provide a guide for long-lifetime construction and safe maintenance in steel structural bridge.
Tensile-Mechanical Degradation-Properties and J-C Constitutive Model of Studs after Strong-Acid Corrosion
KSCE J Civ Eng
KSCE Journal of Civil Engineering ; 26 , 9 ; 3954-3967
2022-09-01
14 pages
Article (Journal)
Electronic Resource
English