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Effect of corrosion pits on fatigue life and crack initiation

机译：腐蚀坑对疲劳寿命和裂纹萌生的影响

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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.
机译：腐蚀疲劳被认为是在腐蚀环境下工作的结构的主要破坏机理之一，现有的对坑腐蚀的研究表明，裂纹不一定从坑的底部开始，而从坑开始的裂纹取决于坑的形状（首先研究了腐蚀坑的尺寸和形状的发展及其对疲劳寿命的影响。对预腐蚀和光滑的试样进行了疲劳试验以进一步研究腐蚀坑的影响。然后对各种坑的长宽比进行建模，以计算圆钢在拉伸和弯曲载荷下的SCF。此外，还计算了各种坑长宽比的SCF，有望为工程实践提供参考研究人员方便地找到SCF值。

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