Acoustic emission


Acoustic emission is the highly efficient means of nondestructive testing and examination of materials based on identification of acoustic waves, which are generated by sudden deformation of stressed material and propagate directly from the source to sensors, being then transformed into electric signals. Acoustic emission control devices measure these signals, and then display data the assessment of state and behavior of the object structure is based on.

As known, traditional nondestructive testing methodology (ultrasonic, radiation, eddy-current) allow identification of structural heterogeneity (geometrical deficiencies) through emission of some form of energy into the object structure. In contrast to these methods, acoustic emission testing applies another approach: not geometrical deficiencies are identified but microscopic motions. Such method allows to identify the growth of the tiniest cracks, breaks in inclusions, gas or liquid leaks — various processes creating acoustic emission.

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    Natalia Zholudeva
    Nondestructive Testing.