Effect of Corrosion Damage on Fatigue Performance of Q690D Steel Unequal Thickness Butt Joints
GUAN Xiaodi
GUO Hongchao
ZHAO Yue
YANG Dixiong
PAN Yuhan
Abstract：Salt spray and dry-wet cycle accelerated corrosion tests were employed to simulate the marine atmospheric corrosion environment,and high-cycle fatigue tests were conducted on Q690D steel unequal thickness butt joint specimens with different corrosion cycles to systematically investigate the effect of corrosion damage on fatigue properties.The parameters of the fatigue damage evolution equation based on continuum damage mechanics were calibrated.The results show that with the increase in the corrosion cycle,the mass loss rates of specimens rise,the corrosion rate decreases,and the maximum depth of surface pits increases.Surface corrosion damage forms stress concentration sources,induces micro-crack initiation,and significantly reduces the fatigue properties of the joints.The fatigue fracture of the corroded specimens exhibits multi-source characteristics.The greater the initial damage degree,the faster the fatigue damage growth rate.
Keywords：Q690D steelunequal thickness butt jointfatigue performancecorrosioninitial damage
Publication Date：2025-11-30
Online Publishing Date：2025-12-09(First online date of this platform, not the publication date of the document)
Pages：9( 1111-1119 )