Shearographic and holographic defect detection for composite materials

Eckart Schnack; Peter A. Klumpp

doi:10.1117/12.135319

1 January 1992 Shearographic and holographic defect detection for composite materials

Eckart Schnack, Peter A. Klumpp

Proceedings Volume 1553, Laser Interferometry IV: Computer-Aided Interferometry; (1992) https://doi.org/10.1117/12.135319
Event: San Diego, '91, 1991, San Diego, CA, United States

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.

Citation Download Citation

Eckart Schnack and Peter A. Klumpp "Shearographic and holographic defect detection for composite materials", Proc. SPIE 1553, Laser Interferometry IV: Computer-Aided Interferometry, (1 January 1992); https://doi.org/10.1117/12.135319

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