Health monitoring of an adhesive joint using a multiaxis fiber grating strain sensor system

Whitten L. Schulz; Eric Udd; Mike Morrell; John M. Seim; Ignacio M. Perez; Angela Trego

doi:10.1117/12.339906

28 January 1999 Health monitoring of an adhesive joint using a multiaxis fiber grating strain sensor system

Whitten L. Schulz, Eric Udd, Mike Morrell, John M. Seim, Ignacio M. Perez, Angela Trego

Proceedings Volume 3586, Nondestructive Evaluation of Aging Aircraft, Airports, and Aerospace Hardware III; (1999) https://doi.org/10.1117/12.339906
Event: Nondestructive Evaluation Techniques for Aging Infrastructures and Manufacturing, 1999, Newport Beach, CA, United States

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.

Citation Download Citation

Whitten L. Schulz, Eric Udd, Mike Morrell, John M. Seim, Ignacio M. Perez, and Angela Trego "Health monitoring of an adhesive joint using a multiaxis fiber grating strain sensor system", Proc. SPIE 3586, Nondestructive Evaluation of Aging Aircraft, Airports, and Aerospace Hardware III, (28 January 1999); https://doi.org/10.1117/12.339906

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