Experimental and numerical study on cyclic behavior of corroded Q345 steel. (September 2022)

• Record Type: Journal Article
• Authors: Zhang, Yuelin; Fang, Cheng; Wang, Wei
• Is Part Of: Journal of constructional steel research. Volume 196(2022)
• Publication Date: 2022-09
• Subjects: Corrosion -- Low-cycle fatigue (LCF) -- Steel structures -- Seismic -- Multi-hazard; Steel, Structural -- Periodicals; Building, Iron and steel -- Periodicals; Acier de construction -- Périodiques; Construction métallique -- Périodiques; 624.1821
• DOI: 10.1016/j.jcsr.2022.107369
• Languages: English
• ISSNs: 0143-974X

Abstract

Abstract: The aim of the present work is to study the influence of corrosion on the hysteretic behavior of low-alloy steel. Firstly, neutral salt spray (NSS) test was conducted on Q345 steel dog-bone flat-plate specimens, and then cyclic loadings with two different strain amplitudes, i.e., ±1% and ± 3%, were applied to the corroded specimens. After the experimental study, finite element (FE) models of the corroded flat-plate specimens were re-constructed based on inverse modeling technique. Particle swarm optimization (PSO) was adopted to calibrate the constitutive model parameters of Q345 steel, and Bonora fracture criterion was introduced in the FE model. According to the experimental and numerical results, corrosion has a negligible influence on the single-cycle energy dissipation capacity of corroded flat-plate specimens, and has a minor influence on the load-carrying capacity and elastic stiffness. A 5.73% mass loss causes about 10% degradation of peak load and elastic stiffness. However, corrosion has a significant influence on the low-cycle fatigue (LCF) life of the specimens, where a 5.73% mass loss reduces the LCF life by 80%. The corrosion pits cause evident changes of the stress distribution within the specimens under cyclic loading, and in particular, high stress triaxiality and quick accumulation of equivalent plastic strain at the edge of the corrosion pits accelerate crack initiation and propagation at those stress concentration locations. Highlights: Cyclic tests were conducted on corroded Q345 steel. Corrosion has little influence on single-cycle energy dissipation capacity of Q345 steel. 5.73% mass loss causes about 10% degradation of Q345 steel's load-carrying capacity and elastic stiffness. 5.73% mass loss causes about 80% degradation of Q345 steel's fatigue life. An accurate simulation framework to predict the cyclic behavior of corroded Q345 steel was proposed.