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Proceedings Paper

Quality control of fiber-reinforced composites by means of the shearographic and holographic methods
Author(s): Wolfgang Steinchen
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Paper Abstract

The shearographic and holographic interferometry were employed as nondestructive testing (NDT) methods for detecting flaws and delaminations in fiber reinforced composites. Different nondestructive loading techniques were utilized to stress the composites. Using shearography two states of deformation are recorded by double-exposing a Holotestfilm in an ordinary camera. In the tele-lens of the camera a shearing element inside resp. outside the focus is integrated. Rigid body motions of the specimen are not recorded. Local deformation irregularities caused by a defect under the surface of the specimen are not superimposed by an interference pattern, e.g., in the case of the internal pressure differential. The shearogram shows dark and bright fringes which can be interpreted as the gradient of the deformation. The represented shearograms compared with the equivalent holograms show the detection of the irregularities which can be analyzed by an image processing system.

Paper Details

Date Published: 15 February 1993
PDF: 12 pages
Proc. SPIE 1756, Interferometry: Applications, (15 February 1993); doi: 10.1117/12.140804
Show Author Affiliations
Wolfgang Steinchen, Univ. Gh Kassel (Germany)

Published in SPIE Proceedings Vol. 1756:
Interferometry: Applications
Ryszard J. Pryputniewicz; Gordon M. Brown; Werner P. O. Jueptner, Editor(s)

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