海水腐蚀介质中金属材料疲劳裂纹扩展速率测试方法研究

With single-edge notch three-point bending (SEB) specimen, a set of corrosion solution circulation device is devised, fatigue crack propagation tests in the corrosion medium of seawater are implemented with the compliance methods of the test crack length. During the test, corrosion current and corrosion potential were detected by using the electrochemical methods, which indicates that the device fullly meets the item of GB/T 6398. Using the devise, fatigue crack propagation tests of a high-strength steel are conducted in the seawater corrosion environment. As well as, the Comparison and analysis of fatigue crack growth rates in air and artificial sea water were implemented. The results show that fatigue crack propagation in the two medium has little differernce when the loading frequency is 2Hz.