Abstract
Acoustic emissions are noises made by materials as they deform. The alternative term ‘stress-wave emission’ (SWE) is preferable since it does not imply restriction to audible frequencies. Many common deformation mechanisms generate detectable emission. The effect has been recognized and studied with increasing interest in the last fifteen years, and experience in this area has now reached a point where stress-wave analysis is being used for large-scale nondestructive testing and also for materials research in the laboratory.
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