Abstract
Pitting corrosion threatens the safety of steel structures by degrading material properties. In this paper, the effect of pitting damage on tensile behavior of Q345 and Q235 steels is studied experimentally and numerically. Material tensile tests were carried out on small steel specimens with artificially introduced corrosion pits of a cylindrical, semi-ellipsoidal, or conical shape, and used to validate their numerical models. Numerous numerical analyses were carried out to study the tensile properties and behavior of different steels due to varying pitting features in the pit shape and degree of volume loss (DOV) of corroded material. Results showed that pit shape influences the tensile properties of corroded steel significantly, depending on the ratio of pit diameter to pit depth. In the worst case, variation of pit shape could result in a difference of 7.58% in strength deterioration, and it could become worse if combined with the random nature of pit size, pit depth, and pitting distribution. An equivalent material model was proposed to correlate the reduction ratios of tensile properties with the DOV and pit shape. The ultimate strength of pitted plates can be predicted properly, using the equivalent material model instead of modelling the detailed corrosion pits.
Published Version
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