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Proceedings Paper

Detection of the onset of damage using an extrinsic Fabry-Perot interferometric strain sensor (EFPI-SS)
Author(s): Clare A. Paul; George P. Sendeckyj; Gregory Paul Carman
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Paper Abstract

The ability of the extrinsic Fabry-Perot interferometric strain sensor (EFPI-SS) to detect the onset of damage in composite laminates was investigated. Composite specimens with EFPI-SS embedded near a local stress concentrator (0.25 in. diameter hole) were subjected to quasi- static and constant amplitude cyclic loading. The test results showed that the particular EFPI- SSs used in this study were inadequate for structural health monitoring purposes. Many sensors did not survive the specimen fabrication process, and the surviving sensors degraded at an applied gross stress of approximately 30 ksi. The degradation seems to be due to the failure of the adhesive bond between the single-mode optical fiber lead and silica glass tube. Nevertheless, the data shows that improved EFPI-SSs can be used to monitor local strain changes in composites during service usage.

Paper Details

Date Published: 12 July 1993
PDF: 11 pages
Proc. SPIE 1918, Smart Structures and Materials 1993: Smart Sensing, Processing, and Instrumentation, (12 July 1993); doi: 10.1117/12.147973
Show Author Affiliations
Clare A. Paul, Air Force Wright Lab. (United States)
George P. Sendeckyj, Air Force Wright Lab. (United States)
Gregory Paul Carman, Univ. of California/Los Angeles (United States)


Published in SPIE Proceedings Vol. 1918:
Smart Structures and Materials 1993: Smart Sensing, Processing, and Instrumentation
Richard O. Claus, Editor(s)

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