In the aerospace industry, detecting the cracks that sometimes develop around fastener holes is a major issue for aircraft maintenance and life extension. Parts undergoing inspection are usually made of an aluminum al...
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In the aerospace industry, detecting the cracks that sometimes develop around fastener holes is a major issue for aircraft maintenance and life extension. Parts undergoing inspection are usually made of an aluminum alloy and typically have a complex geometry. Cracks of concern can be as small as 0.04 inches and can be located anywhere throughout the fastener thickness. The challenge is to design a technique that can be used from a single side, that does not require removal of the fastener, and that provides satisfactory resolution. The phased-array concept is to use a large linear array in a pseudo-tandem configuration, in which different elements of the same probe are used for transmission and reception. Excellent resolution is achieved using this technique, as shown in both simulation and experimental results.
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