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Proceedings Paper

Building better flaws for thermographic qualification and quantification
Author(s): James L. Walker; Samuel S. Russell; Gary L. Workman
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Paper Abstract

The concurrent inspection of calibrated test panels manufactured with artificially created, although realistically behaving flaws is essential to providing confidence in the thermographic inspection process of advanced composite structure. For honeycomb type composite structures of principle interest is identifying delamination and disbond type defects along the bondline between the core and faceplate, as well as within the faceplate itself. To ensure that these types of flaws will be caught during the inspection cycle of a structural component the test panels must have similar behaving artificial defects. A common practice for the manufacture of artificial flaws in test panels is the use of embedded Teflon tape, or other release agents, for force an unbond condition within the laminate. These procedures though, yield results that are questionable, since one is not sure whether or not the inspection process is identifying the unbond or the inserted materials. Several fabrication methods are compared and contrasted in this paper, for controlling the degree of disbond to simulate defects resulting from mishandling or manufacturing errors without the need for inserting foreign materials in the laminate. These results are also compared to those obtained by inspecting a composite inter-tank test structure which used Teflon tape as the means to simulate critically sized defects.

Paper Details

Date Published: 14 November 1996
PDF: 7 pages
Proc. SPIE 2945, Nondestructive Evaluation of Aging Aircraft, Airports, and Aerospace Hardware, (14 November 1996); doi: 10.1117/12.259122
Show Author Affiliations
James L. Walker, Univ. of Alabama in Huntsville (United States)
Samuel S. Russell, NASA Marshall Space Flight Ctr. (United States)
Gary L. Workman, Univ. of Alabama in Huntsville (United States)

Published in SPIE Proceedings Vol. 2945:
Nondestructive Evaluation of Aging Aircraft, Airports, and Aerospace Hardware
Raymond D. Rempt; Alfred L. Broz, Editor(s)

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