Rapid nondestructive inspection of composites structures is of increasing importance for several reasons. As one example, composites are being used for more critical applications, such as in automotive fuel pressure vessels where failures would endanger many people. Further, important structural assemblies should be inspected for hidden damage after traumatic events. Flawed structures can be repaired, and the repair should then be verified using NDI techniques. These inspection procedures must be efficient and cost effective. Whole-field optical methods seem best for assessment of damage and repair certification. They are non-contacting, potentially quick, remote, and sensitive to a wide variety of flaws and damage. No one method seems adequate by itself. This paper describes the combined use of three optical interference techniques for damage inspection. They are: Electronic Speckle Pattern Interferometry; Electronic Shearographic Interferometry; Laser Doppler Velocimetry. Several different loading approaches are also described. Results illustrate detection of damage in single plates, in pressure vessels and in the adhesive joinings between composite panels and metal frame. The approach seems efficacious in terms of speed, size of sample, and detection capability.
Combined interferometric techniques for assessment of damage in composites structures
Kombinierte Technik mit Interferenzmeßverfahren zur Bewertung von Schäden in Verbundstoff-Strukturen
1994
8 Seiten, 6 Bilder, 12 Quellen
Conference paper
English
Combined interferometric techniques for assessment of damage in composites structures
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