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Residual Strain Characteristics of Nickel-coated FBG Sensors

니켈이 코팅된 FBG 센서의 잔류 변형률 특성

  • 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.)
  • 조원재 (국립한경대학교 기계공학과) ;
  • 황아름 (국립한경대학교 기계공학과) ;
  • 김상우 (국립한경대학교 기계공학과)
  • Received : 2016.11.27
  • Accepted : 2017.04.12
  • Published : 2017.07.01

Abstract

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.

Keywords

FBG;Memory Effect;Electroless Plating;Electroplating;Cycle Loading Test

Acknowledgement

Supported by : 한경대학교

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