16 April 2001 Embedded fiber optic sensors: performance aspects and the single-fiber fragmentation test
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Abstract
In recent years optical fibers have been developed increasingly for sensor applications. In many of these applications optical fiber Bragg gratings are embedded in a matrix material as temperature or strain gauges. In effect, embedded optical fiber sensors are single-fiber composite (SFC) materials. The mechanical properties of fiber-reinforced composite materials are an important area of research, as well as the mechanical reliability of fibers used for sensors. The multiple fragmentation, with increasing load, of the fibers in SFCs is controlled by transfer of stress from the matrix to the fiber. The number of fiber fragments increases rapidly with increasing strain after the initial break with the fragment length decreasing until a limiting fragment length is reached. Analysis of the fragmentation process allows information to be obtained on the strength of the optical fiber on different length scales and on the transfer of stress from the matrix to the fiber. In this paper we present the issues surrounding mechanical tests on an optical flber/matrix SFC and the mechanical reliability of fibers for sensors. We consider the experimental difficulties and issues which must be addressed for a full understanding of interface effects and their effects on mechanical reliability.
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Stephen N. Kukureka, Angelo Pedicini, Darran R. Cairns, "Embedded fiber optic sensors: performance aspects and the single-fiber fragmentation test", Proc. SPIE 4215, Optical Fiber and Fiber Component Mechanical Reliability and Testing, (16 April 2001); doi: 10.1117/12.424380; https://doi.org/10.1117/12.424380
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