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Abstract

Laser holographic interferometry is applied to the detection of impact-induced damage and marcels in graphite-epoxy composites. Real-time and two-reference-beam interferometry are implemented while the specimens are thermally strained. For small temperature increases irregular fringe patterns are observed, indicative of deformation anomalies, and consequently, of the presence of defects. For the impacted specimens, closed-shape fringes begin to form at the impacted areas, and the more damaged the specimen, the earlier their appearance and greater their extent. For the specimen containing the marcels the fringes appear very wavy. In both cases pseudo three-dimensional images of the deformed surfaces are obtained which provide a very clear picture of the effect of the defect.

Additional information

Authors: ZANETTA P, JRC Ispra (IT);SOLOMOS G P, JRC Ispra (IT);ZÜRN M, JRC Ispra (IT);LUCIA A C, JRC Ispra (IT)
Bibliographic Reference: Article: Optics & Laser Technology, Vol. 25 (1993) No. 2, pp. 97-102
Record Number: 199310925 / Last updated on: 1994-11-29
Category: PUBLICATION
Original language: en
Available languages: en