Device and method for testing metal corrosion fatigue crack extension

The invention discloses a device and a method for testing metal corrosion fatigue crack extension. The device comprises a pedestal and a corrosive medium accommodation container, wherein a fatigue machine clamping piece is designed on the lower surface of the pedestal and used for clamping the lower chuck of the fatigue machine; a testing specimen locking piece is designed on the upper surface of the pedestal and used for fixing the lower end of a fatigue testing specimen; the upper end of the fatigue testing specimen is clamped by a fatigue machine upper clamp; the alternating load of the fatigue machine can be transferred to the testing specimen through the fatigue machine clamping piece; the corrosive medium accommodation container adopts a cylindrical structure; the bottom end of the cylindrical structure is fixedly mounted on the upper surface of a circular table in the pedestal; the testing specimen locking piece in the pedestal is positioned in the corrosive medium accommodation container. The device is used for testing according to the test fatigue testing parameters until the working section of the fatigue testing specimen is broken; in the process, a microscope is utilized to record and shoot the producing-extending-fracturing process of the crack. The device disclosed by the invention has the advantage of realizing the corrosive fatigue performance test of the metal material in the corrosive medium under the standing state.