Nondestructive Inspection (NDI) on Bonded Sandwich Structures using Shearography

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An NDT method for a structure with stiff stainless steel skins and low-density foam cores was to be found. Disbonds down to 25 mm should be detected. The defects may be positioned between skin and core or in the bondline between sheets in areas of multiple layers. The defects may be open to ambient air at the edges.

The investigation included literature studies, selection of feasible methods, evaluation of these methods, and finally selection of a preferred NDT method and application trials.

Inspections on three typical structure areas were made for each method as a Round-Robin test. Only one method detected all defects in all structures during the Round-Robin test: Shearography. The investigation continued with application of shearography on different structures.

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