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Acoustic Emission Testing
This book addresses one of the most interesting techniques used for the non-destructive evaluation of materials: The acoustic emission technique (AET). Compared to other non-destructive testing (NDT) methods, AET
can monitor changes in materials behavior over a long time and without moving one of its components i.e. sensors. This makes the technique quite unique along with the ability to detect crack propagations occurring not only on the surface but also deep inside a material. Consequently, AET is an important addition to NDT methods surveying actively a structure by scanning for geometric defects as well as to visual inspection methods observing a materials surface.
There are many reports on successful AE applications in engineering at a broad variety of materials, material compositions and structures. Applications to many different materials are addressed in this book, but the success of these applications does not necessarily mean that the AET is easy to be applied. Depending on the degree of heterogeneity of the material and the complexity of the structure under test there could exist a variety of problems that need to be solved. The status of applications ranges from scientific/experimental to industrial/routine. A monitoring experiment or application should therefore take the experience into account that is compiled in this book. Although the setup necessary to conduct AE measurements appear to be very easy on the forehand, many issues need to be solved to obtain reliable results and to interpret them in the right way.
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