Experimental Study of Flexural Behavior of DH36 Steel Plates with Mechanically Induced Pits Under Cyclic Loading

• Published in: Journal of failure analysis and prevention 2023-12, Vol.23 (6), p.2378-2385
• Main Authors: Liu, Xueshu, Yan, Bingrong, Sun, Hongtu
• Format: Article
• Language: English
• Subjects: Cyclic loads; Diameters; High strength steels; Mechanical properties; Pitting (corrosion); Steel plates; Stress concentration
• ISSN: 1547-7029; 1864-1245
• DOI: 10.1007/s11668-023-01773-x

Local discontinuities and stress concentrations caused by pitting corrosion on a component can significantly affect the mechanical performance of a structure. To deeply understand the problems, specimens are created from high-strength steel DH 36 and tests are performed to analyze the flexural behavior of plate specimens with different pitting crater parameters, pitting distribution and pitting interaction. The results show that both the pitting diameter and pitting depth have negative effects on mechanical performance of specimen and the volume loss rate is more suitable to be used as damage indicator to describe the degradation in mechanical properties of specimens with pitting. Moreover, when the corrosion region suffers from compressive loads the specimen can carry more loads than tensile case. In addition, it was found that cracks firstly appear at the edge of pit due to stress concentration and evolve toward the width and thickness directions of specimen. After cracks reach the bottom of pit they stop evolving, which indicates that stresses are not the reason causing the specimen failure for undamaged one.