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Non-contact measurement of the coefficient of thermal expansion of Al 6061-T6 with fiber Bragg grating sensors

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Abstract

An experimental study describing the non-contact measurement of the coefficient of thermal expansion of an aluminum (Al-6061-T6) specimen with two fiber Bragg grating sensors using a pair of C-lens collimators was carried out. The collimators were used for the freespace coupling between the fiber Bragg sensors and the optical sensing interrogator. During the experiment, the wavelength distortion of the optical signals was observed. Consequently, the measured thermal strains were corrected using an estimated collimator correction factor of 0.8466. The coefficient of thermal expansion of the specimen was then calculated to be (22.0 ± 0.1)×10−6°C−1 for every 5°C step in the range 35°C∼75°C, which was in good agreement with the typical value of 23.6×10−6°C−1 for aluminum.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Hanyang University, 1271, Sa 3-dong, Sangnok-gu, Ansan-si, Gyeonggi-do, 426-791, Korea

    Khazar Hayat & Sung Kyu Ha

Authors
  1. Khazar Hayat
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  2. Sung Kyu Ha
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Correspondence to Sung Kyu Ha.

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Recommended by Associate Editor Heung Soo Kim

Khazar Hayat received his B.S. in Mechanical Engineering from University of Engineering and Technology (UET), Lahore, Pakistan in 2005. He is currently enrolled as “M.S. leading Ph.D. student” at Hanyang Structural and Composites Lab (HSCL) Erica Campus, Hanyang University, Korea. His research interests include Composite structure design and optimization, as well as Structural health monitoring of wind turbine systems.

Sung Kyu Ha received his B.S., M.S., Ph.D. and Post-Doc. in Mechanical Engineering from Stanford University, USA during 1984–1991. He is currently acting as professor at Mechanical Department, Erica Campus, Hanyang University, Korea. His research interests include Mechanical design with advanced composites, Micro mechanics, Structural health monitoring, Multi-disciplinary design and optimization.

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Hayat, K., Ha, S.K. Non-contact measurement of the coefficient of thermal expansion of Al 6061-T6 with fiber Bragg grating sensors. J Mech Sci Technol 28, 621–626 (2014). https://doi.org/10.1007/s12206-013-1126-3

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  • DOI: https://doi.org/10.1007/s12206-013-1126-3

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