A technique using the Diffracto D-Sight method to locate indentations associated with low energy impact damage is described. In graphite/epoxy specimens good correlation was observed between internal impact damage as shown on ultrasonic C-scan images and indentations detected with the D-Sight method. Test specimens are currently mounted on an aircraft to observe the influence of in-service surface degradation on technique resolution. The method has the potential for inexpensive, rapid and objective detection of low energy impact damage over large areas of composite aircraft structure. Application of this method, because of its inherent reliability, could result in the increasing of the design allowable strain levels for some composite components. Included are two examples of possible application of D-Sight to metal aircraft for inspection of cold worked holes and detection of cracks.
A technique for rapid inspection of composite aircraft structures for impact damage
Ein Verfahren für die schnelle Prüfung von Verbundflugzeugstrukturen bei Stoßbeschädigungen
1990
10 Seiten, 14 Bilder, 1 Tabelle, 8 Quellen
Conference paper
English
D-sight technique for rapid impact damage detection on composite aircraft structures
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