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Apr 26, 2012
Shear Lag Model for Embedded Interferometric Optical Fiber Sensors
Authors: Yongtao Dong, Qingbin Li, and Farhad AnsariAuthor Affiliations
Publication: Condition Monitoring of Materials and Structures
Abstract
The ability of an embedded optical fiber sensor to monitor strain distribution in a structural material depends on the bonding characteristic between the host material and optical fiber. A mathematical model was established in order to compute the effect of fiber optic coating characteristics and the gauge length on the strain transfer mechanism. The validity of the model was verified through the analysis of a finite element model representing the interface between the fiber core, coating and the host material. A strain modification factor is introduced in order to account for the shear lag and convert the fiber optic measured strains to the actual strains in the structure. The theoretical findings were verified through a series of experiments involving white light interferometry. The experimental investigation comprised of testing concrete cylinders in direct tension. The cylinders were instrumented with embedded fiber optic sensors as well as conventional extensometers for comparison. The strain modification factor was employed for the interpretation of strain in concrete from the fiber optic sensed data.
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© 2000 American Society of Civil Engineers.
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Published online: Apr 26, 2012
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Yongtao Dong
Ph.D. Candidate, Civil & Materials Engineering (MC 246), University of Illinois at Chicago, Chicago, Illinois 60607-7023.
Qingbin Li
Post Doctoral Fellow, University of Illinois at Chicago. Currently, Professor, Dept. of Hydraulic Structures, Tsinghua University, Beijing, China
Farhad Ansari
Professor, Civil & Materials Engineering (MC 246), University of Illinois at Chicago, Chicago, Illinois 60607-7023.
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