Eddy-sonic test method

This method is based on the principle that a mechanical force is inherently associated with flow of eddy currents. Since the eddy current field is time-variant, the mechanical force is also time-variant. Therefore, an acoustic vibration can be induced in the proper sample. To use this principle in nondestructive testing of honeycomb materials, some constituents must be electrically conductive. [Pg.300]

The major advantage of the method is that no liquid energy compliant is needed, because air serves as a satisfactory coupling medium. The eddy-sonic method is useful for detecting both near-side and far-side unbonds in thin honeycomb structures. It can also be used to detect crushed core, fractured core, and voids in the adhesive. [Pg.300]

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