대한기계학회논문집A (Transactions of the Korean Society of Mechanical Engineers A)

  • 제41권7호
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  • Pages.613-620
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  • 2017
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  • 1226-4873(pISSN)
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  • 2288-5226(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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니켈이 코팅된 FBG 센서의 잔류 변형률 특성

Residual Strain Characteristics of Nickel-coated FBG Sensors

  • 조원재 (국립한경대학교 기계공학과) ;
  • 황아름 (국립한경대학교 기계공학과) ;
  • 김상우 (국립한경대학교 기계공학과)
  • Cho, Won-Jae (Dept. of Mechanical Engineering, Hankyong Nat'l Univ.) ;
  • Hwang, A-Reum (Dept. of Mechanical Engineering, Hankyong Nat'l Univ.) ;
  • Kim, Sang-Woo (Dept. of Mechanical Engineering, Hankyong Nat'l Univ.)
  • 투고 : 2016.11.27
  • 심사 : 2017.04.12
  • 발행 : 2017.07.01
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초록

금속이 코팅된 FBG(fiber Bragg grating) 센서는 구조물이 과거에 겪은 최대 변형률을 기억하는 기억효과(memory effect)를 가진다. 본 연구에서는 무전해 도금법과 전해 도금법을 이용하여 약 $43{\mu}m$의 두께를 가지는 니켈(nickel)이 코팅된 FBG 센서를 제작하였다. 니켈 코팅된 FBG 센서의 잔류 변형률 생성 성능, 즉, 기억효과를 검증하기 위해 반복하중 실험(잔류 변형률 생성실험)을 수행하였다. 인가한 최대 변형률의 크기가 증가함에 따라 잔류 변형률이 증가함을 확인함으로써 기억효과를 검증하였다. 본 연구에서 수행한 니켈이 코팅된 FBG 센서의 제작 기법과 센서에 대한 반복하중 실험결과는 향후 광섬유 센서를 이용한 구조물 건전성 감시(SHM, structural health monitoring)기법 개발에 기본 데이터로서 활용될 것이다.

A metal-coated FBG (fiber Bragg grating) sensor has a memory effect, which can recall the maximum strains experienced by the structure. In this study, a nickel-coated FBG sensor was fabricated through electroless (i.e., chemical plating) and electroplating. A thickness of approximately $43{\mu}m$ of a nickel layer was achieved. Then, we conducted cyclic loading tests for the fabricated nickel-coated FBG sensors to verify their capability to produce residual strains. The results revealed that the residual strain induced by the nickel coating linearly increased with an increase in the maximum strain experienced by the sensor. Therefore, we verified that a nickel-coated FBG sensor has a memory effect. The fabrication methods and the results of the cycle loading test will provide basic information and guidelines in the design of a nickel-coated FBG sensor when it is applied in the development of structural health monitoring techniques.

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