| ZHANG Yu,ZHANG Chun-tao.Effect of Environmental Corrosion on Fatigue Properties of Q345 Equal Angles[J],45(7):36-40 |
| Effect of Environmental Corrosion on Fatigue Properties of Q345 Equal Angles |
| Received:March 10, 2016 Revised:July 20, 2016 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2016.07.006 |
| KeyWord:Q345 angle steel atmospheric corrosion corrosion mode fatigue properties simulated acid rain fatigue load |
| Author | Institution |
| ZHANG Yu |
School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang , China |
| ZHANG Chun-tao |
School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang , China |
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| Abstract: |
| Objective To study the effect of corrosion on the fatigue properties of Q345 equilateral angle steel, which lays foundation for the analysis of fatigue performance variation of specimens under condition of alternating cycles of "corrosion-fatigue". Methods Firstly, based on the test results of continuous fatigue vibration and interval fatigue vibration, the effect of fatigue loading modes on the fatigue performance of the specimens was analyzed. The interval vibration of the specimens was completed in three steps, and the vibration times of each step was 1/3 of that of continuous fatigue vibration. Then, three kinds of etching methods were adopted according to the different times of "immersion-drying", and accelerated corrosion damage test was conducted in acid solution with a pH value of 2. With different corrosion, 3 groups 39 Q345 equilateral angle steel was studied on by the fatigue cyclic loading test. Corrosion fatigue test was carried out on 3 groups of 39 Q345 angle steel parts using "corrosion-fatigue" alternate cycling loading. Based on the phenomena and results of the corrosion fatigue tests, the changing law of fatigue performance with corrosion fatigue damage was analyzed, and the degeneration law of wind-induced vibration fatigue properties of Q345 angle steel with the occurrence and development of corrosion damage in atmospheric environment was investigated. Results When Smax was 221.43 MPa, the average fatigue life in corrosion modes CF2 and CF2 of the 8 specimens was decreased by 5.1% and 2.7% as compared with CF3, whereas the fatigue life was not changed significantly when Smax was 308.39 MPa or 221.43 MPa, but when Smax decreased to 156.22 MPa, the fatigue life of CF1 and CF2 was decreased by 6.3% and 4.5% as compared with that of CF3, respectively. Conclusion With increasing times of “Immersion-drying” alternating cycles, the damage increased, and the fatigue life of specimens decreased, showing that the corrosion fatigue life of specimens was obviously affected by the atmospheric environmental dry-wet alternate corrosion. In the same type of corrosion, the smaller the fatigue load, the more significant the influence of corrosion, and the more obvious the brittle failure characteristics. |
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