Acoustic Emission Signal Analysis of Aluminum Alloy Fatigue Crack

Fatigue fracture is the most common failure mode of engineering equipment. It is difficult to monitor the fatigue crack because the fatigue crack is very small. The sizes of fatigue cracks are about several micrometers to several decade millimeters. Acoustic emission (AE) of material is a common phenomenon; In fact, it has relation with the material states. In this paper, the acoustic emission test method about crack is used and the characteristics of different phases of aluminum alloy cracks are analyzed. Practical test shows the AE method could detect the cracks that common method could not detect them. To predict the length of crack precisely is important. AE can predict the size of crack quite well. The result is of practical engineering significance.