Acoustic Emission (AE) is simply the stress waves, in the frequency range of ultrasound usually between 20 kHz and 1 Hz, generated in the materials due to deformation, crack initiation and growth, crack opening and closure, dislocation movement, twining and phase transformation, fiber breakage and delamination.
Advantages
Ability to detect a range of damage mechanisms including, but not limited to, fibre breakages, friction, impacts, cracking, delamination and corrosion in their early stages, before they become significant issues.
Can be conducted during operation, during qualification (proof) testing or development testing.
Can locate damage sources and can be differentiate these based on acoustic signatures.
Global monitoring of a structure
Assesses the structure or machine under real operational conditions
A non-invasive method
Operational in hazardous environments, including high temperatures, high pressures and corrosive and nuclear environments
Can be conducted remotely
Can detect damages in defects that are difficult to access with conventional non-destructive testing techniques
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