A Method for the Identification of the Types of Macrofracture of Structural Materials by the Parameters of the Wavelet Transform of Acoustic-Emission Signals

We study the specific features of acoustic-emission signals accompanying the macrofractures of materials with different structures. For this purpose, we use the results of the analysis of the local features of acoustic-emission signals by using their continuous wavelet transforms. According to the criterion used for the identification of the types of macrofracture, we analyze brittle, ductile-brittle, and ductile fractures. We also establish the typical differences between signals according to the frequency bandwidth, duration of emission, and changes in the values of predominant frequency.