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Effects of Transverse Strains on the Measurement of the Thermal Expansion of the Composite Using FBG Sensors

[+] Author Affiliations
Hong-Il Kim, Jae-San Yoon, Jae-Hung Han

Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea

Paper No. SMASIS2010-3605, pp. 375-381; 7 pages
doi:10.1115/SMASIS2010-3605
From:
  • ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems
  • ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, Volume 1
  • Philadelphia, Pennsylvania, USA, September 28–October 1, 2010
  • Conference Sponsors: Aerospace Division
  • ISBN: 978-0-7918-4415-1 | eISBN: 978-0-7918-3886-0
  • Copyright © 2010 by ASME

abstract

The effects of the transverse strain on the fiber gratings to the wavelength shift of the FBG (fiber Bragg grating) sensor were investigated. A new FBG model including the strain transmissibility coefficients along the longitudinal and transverse directions was proposed. The finite element method was applied to obtain the strain transmissibility coefficients of the interface between FBG sensor and base structure surface. The wavelength shift of each FBG sensor was calculated for the assumed strain condition of the base structures. Simulated core strains based on both conventional 1-DOF model and the present model were compared. The numerical results showed that the surface strains could be well predicted using the proposed FBG model while the conventional 1-DOF model gave large errors when the transverse strain of the base structure was significant as in composite structures under thermal loadings.

Copyright © 2010 by ASME

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