Tensile strength of Q345 steel with random pitting corrosion based on numerical analysis: Fid-Bau Portal

Tensile strength of Q345 steel with random pitting corrosion based on numerical analysis

Zhao, Zhongwei / Zhang, Hongwei / Xian, Lina / Liu, Haiqing

Abstract Steel plates are widely used in various structures, including building structures, bridges, ocean platforms, and industrial equipment. Such steel structures inevitably suffer from corrosion, the most common of which is pitting corrosion. Pitting corrosion greatly affects the tensile strength of steel. Hence, revealing the influence of pitting corrosion on steel strength is necessary. The influence of predefined pitting corrosion with different shapes on the tensile behavior of steel was investigated in this work. Then, the influence of the layout of corrosion pits was studied. A finite element model of coupons with random pitting corrosion was also established to extend the work to actual conditions. Stochastic numerical analysis was conducted to reveal the relationship between nominal yield and ultimate strength given the mass loss ratio of Q345 steel. A highly accurate method for predicting the nominal tensile strength of Q345 steel was proposed. The proposed method can also be adopted for pitting corrosion with random depths.

Highlights • The nominal tensile strength was closely related to the T c and χ. • Tensile strength will be overestimated if pitting corrosion is simplified as uniform corrosion. • The accurate analytical method to predict the nominal tensile strength was proposed. • The proposed method can also be adopted for pitting corrosion with random depth.