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Ultrasonic Imaging of Delamination Damage around Fastener Holes in a Graphite/Epoxy Composite Pages: 17 Published: Jan 1992
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View License Agreement Matrix cracking and multiple level delaminations around fastener holes in aircraft composite components can be associated with the overtorquing of fasteners. The damage can be repaired using a resin injection procedure. To determine the effectiveness of the procedure, an improved ultrasonic imaging technique was developed. The basis of this improved ultrasonic imaging technique is the acquisition of ultrasonic data that represent a three-dimensional volume of the specimen in the region surrounding the fastener. Because delaminations near the outer surface will obscure those located deeper within the specimen, two data sets, one from each surface, were collected from the specimen, deconvolved with respect to the transducer impulse response, and combined to form a more complete unified ultrasonic image. Using this image, a precise determination of delamination depth and area was accomplished by creating a series of C-scan images. The ultrasonic images obtained were compared to metallographic data and their correlation with the restoration of strengths and stiffnesses discussed. | ||
