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Proceedings Paper

Health monitoring of an adhesive joint using a multiaxis fiber grating strain sensor system
Author(s): Whitten L. Schulz; Eric Udd; Mike Morrell; John M. Seim; Ignacio M. Perez; Angela Trego
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Paper Abstract

The use of adhesive joints in aerospace structures is becoming increasingly important. From this, arises the problem of assessing joint integrity quickly, non- intrusively, accurately, and inexpensively. Current methods of assessing joint integrity, such as ultrasonics and x- rays, are time intensive and difficult to interpret. Blue Road Research's solution to monitoring adhesive joint integrity quickly and accurately is to embed non-intrusive, multidimensional optical fiber grating strain sensors into or adjacent to the joints. Aluminum double lap adhesive joints were instrumented with the multi-axis grating strain sensors into or adjacent to the joints. Aluminum double lap adhesive joints were instrumented with the multi-axis senors and subjected to tension and fatigue test. Each specimen contained one sensor located either near the bond, embedded at the edge of the bond, or embedded towards the inner bond area. The joints with senors embedded into the adhesive showed minimal strength degradation. Basically, the multiaxis fiber grating strain sensors were found to provide information about transverse strain, axial strain, and transverse strain gradients that can provide important information throughout the adhesive joint. By changing the orientation of the sensor, shear strain and its effects can be clearly measured.

Paper Details

Date Published: 28 January 1999
PDF: 12 pages
Proc. SPIE 3586, Nondestructive Evaluation of Aging Aircraft, Airports, and Aerospace Hardware III, (28 January 1999); doi: 10.1117/12.339906
Show Author Affiliations
Whitten L. Schulz, Blue Road Research (United States)
Eric Udd, Blue Road Research (United States)
Mike Morrell, Blue Road Research (United States)
John M. Seim, Blue Road Research (United States)
Ignacio M. Perez, Naval Air Warfare Ctr. (United States)
Angela Trego, The Boeing Co. (United States)


Published in SPIE Proceedings Vol. 3586:
Nondestructive Evaluation of Aging Aircraft, Airports, and Aerospace Hardware III
Ajit K. Mal, Editor(s)

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