The study of corrosion damage mechanisms in high-strength steel (HSS) has important theoretical value and engineering significance, as HSS is the core material of modern steel structure engineering. In this paper, Q690D HSS specimens with different degrees of corrosion damage were prepared through salt spray and dry and wet cyclic accelerated corrosion tests. Combined with 3D scanning-based reverse modeling and numerical simulation method, the degradation law of tensile mechanical properties of Q690D HSS under a corrosive environment is systematically revealed. The results of the study show that the surface of corroded HSS is uneven, with pits of different sizes distributed. With the increase of corrosion degree, the strength and ductility of HSS gradually decreased, and the maximum tensile strength and elongation decreased by 8.78% and 35.47%, respectively. It shows that the corrosion damage has a more significant effect on the ductility of HSS. As the degree of corrosion increases, the stress concentration effect on the surface of the specimen increases significantly, the critical displacement corresponding to the moment of initial damage occurrence decreases, and the fracture mode shows a clear trend of brittle transition. The numerical simulation results of the finite element (FE) analysis method based on 3D scanning-based reverse modeling are highly consistent with the test data. The reliability and applicability of the method in the assessment of mechanical properties of corroded HSS are verified.
Cao et al. (Fri,) studied this question.