Abstract
Acoustic emission or stress wave emission is the phenomenon of transient elastic wave generation due to a rapid release of strain energy caused by a structural alteration in a solid material. Generally these structural alterations are a result of either internally or externally applied mechanical or thermal stress. Depending on the source mechanism, acoustic emission signals may occur with frequencies ranging from several hertz up to tens of megahertz. Often the observed acoustic emission signals are classified as one of two types: burst and continuous. As shown in Fig. 1, the burst type emission resembles a damped oscillation, while the continuous type emission appears to consist of an overlapping sequence of individual bursts. The importance of acoustic emission monitoring lies in the fact that proper detection and analysis of acoustic emission signals can permit remote identification of source mechanisms and the associated structural alteration of solid materials. This information in turn can augment understanding of material behavior, can be used as a quality control method during materials processing and fabrication, and as a nondestructive evaluation technique for assessing the structural integrity of materials under service conditions.
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Green, R.E. (1980). Basic Wave Analysis of Acoustic Emission. In: Stinchcomb, W.W., Duke, J.C., Henneke, E.G., Reifsnider, K.L. (eds) Mechanics of Nondestructive Testing. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-3857-4_2
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DOI: https://doi.org/10.1007/978-1-4684-3857-4_2
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