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1 October 1990 Characterization of elliptical core fibers for sensing strain in composite materials
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The scope of this research effort centers upon investigating the performance of few-mode, elliptical core (e-core) fibers as strain sensors in composite structures. Primary concerns for the development of such sensors depends upon the assured survivability of the fiber coating during composite cure and the efficient transfer of matrix stresses to the fiber. In previous work, high temperature polyimide coatings for embedded optical fiber strain sensors were examined in this regard. The objective of our current research effort is to characterize the performance of an e-core fiber for sensing strain within cured test coupons of commercially available composite prepreg materials. In these investigations, single, uncoated e-core fibers were placed into graphite/epoxy prepreg material. Test coupons were then processed via the standard protocols for cure. Embedded e-core/composite specimens were examined under controlled tensile and bend conditions. Changes in optical power output were correlated to the mechanically-induced strain on the sample. Memory effects upon optical power output related to strain sensing, indicative of possible matrix/optical fiber debonding, were also investigated.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Celene DiFrancia, Richard O. Claus, John W. Hellgeth, and T. C. Ward "Characterization of elliptical core fibers for sensing strain in composite materials", Proc. SPIE 1307, Electro-Optical Materials for Switches, Coatings, Sensor Optics, and Detectors, (1 October 1990);


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