Effect of corrosion pits on fatigue life and crack initiation
Corrosion fatigue is identified as one of the main failure mechanism for structures working in corrosive environment.The existing study on pit corrosion showed that cracks do not necessarily initiate from the bottom of the pit.Where the crack initiate from pit depends on the pit shape (aspect ratio),loading and the corrosive environment.In this study,firstly,the corrosion pit development in size and shape and its effect on fatigue life were reviewed.Fatigue tests were conducted on pre-pitted and smooth samples to further investigate the pit effect.Then various aspect ratios of pits were modeled to calculate the SCF in a round bar under tension and bending loadings.In addition,the SCF of a wide range of aspect ratios of pits were calculated,by which it is expected to offer the engineering practice and researchers convenience to find SCF value.
Corrosion pits 1 Aspect ratio 2 Stress concentration factor 3 Fatigue life 4
Xin-Yan Zhang Shu-Xin Li Rui Liang R.Akid
School of PetroChemical Engineering Lanzhou University of Technology,Lanzhou 730050,China Corrosion & Protection Centre,School of Materials,University of Manchester,Manchester M13 9PL
国际会议
北京
英文
1-9
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）