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Effect of Pitting Corrosion on Low Cycle Fatigue Behavior of Structural Steels(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2019年03期
Page:
83-90
Research Field:
Publishing date:

Info

Title:
Effect of Pitting Corrosion on Low Cycle Fatigue Behavior of Structural Steels
Author(s):
SHEN Ling-hua1; 2; 3;  AMOAKO-ATTA Godwin1;  WANG Tong2
(1. School of Civil Engineering and Architecture, Zhejiang University of Science & Technology, Hangzhou 310023, Zhejiang, China; 2. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, Zhejiang, China; 3. Zhejiang Provincial Key Laboratory of Space Structures, Zhejiang University, Hangzhou 310058, Zhejiang, China)
Keywords:
steel;  pitting corrosion;  low cycle fatigue;  cyclic void growth model;  equivalent plastic strain
PACS:
TU391
DOI:
-
Abstract:
In order to investigate the effect of pitting corrosion on the low fatigue behavior of steel, the commonly used structural steel Q345 in China was taken as example. Through finite element analysis and based on the micromechanical fracture criteria of cyclic void growth model(CVGM), the low fatigue fracture initiation of the pitting corrosion steel specimens was predicted, and the results were compared with those of intact specimens to explore the effect mechanism of pitting on low cycle fatigue life of steels. On the basis, the effects of the geometrical characteristics, distribution and strain amplitude of the pits on the low cycle fatigue life of steel were studied. The results show that in comparison with uniform corrosion, pitting corrosion can obviously change the stress distribution of steel, and further significantly reduce the low cycle fatigue life of steel by more than 50%, which mainly due to the multiply accumulation of equivalent plastic strain at the fracture initiation points in the pits. When the depth and diameter of pit reach 5% of the width and 20% of the thickness of the section, respectively, the equivalent plastic strain at the fracture initiation points in the pits increases with increasing of pit depth, and the low cycle fatigue life decreases accordingly. Besides, the low cycle fatigue life of multi-pit specimens is significantly lower by 20%-30% than that of single pit ones. Furthermore, as the strain amplitude increases, the effect of pitting corrosion on the low cycle fatigue properties of steel increases gradually. The equivalent thickness design method based on strength equivalence principle can not reflect the effect of pitting on low cycle fatigue properties of steel.

References:


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Last Update: 2019-05-23