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Proceedings Paper

Shearographic and holographic defect detection for composite materials
Author(s): Eckart Schnack; Peter A. Klumpp
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Paper Abstract

Presence and growth of edge delaminations in carbon-fiber/epoxy (CFRP) tensile specimens can be detected by shearography and by holographic interferometry. The in-plane component of the displacement field on the object surface lowers the contrast in the interferogram for either technique. This effect is analyzed quantitatively. The comparison shows that both techniques have about the same sensitivity against in-plane object movements. The influence of object creep motions and of mechanical setup vibrations is also compared. Our experiments have shown that the main advantage of shearography in this application is the intrinsic differentiation of the measured out-of-plane displacement field; it allows clear contour identification of the defective regions in the CFRP specimens.

Paper Details

Date Published: 1 January 1992
PDF: 17 pages
Proc. SPIE 1553, Laser Interferometry IV: Computer-Aided Interferometry, (1 January 1992); doi: 10.1117/12.135319
Show Author Affiliations
Eckart Schnack, Karlsruhe Univ. (Germany)
Peter A. Klumpp, Karlsruhe Univ. (Germany)

Published in SPIE Proceedings Vol. 1553:
Laser Interferometry IV: Computer-Aided Interferometry
Ryszard J. Pryputniewicz, Editor(s)

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