MWCNT/CB hybrid filler를 활용한 동축 섬유형 변형률 센서의 계측 특성 변화에 관한 연구
Study on Sensing Characteristics of Core-shell Structured Fiber Sensor with MWCNT/CB Hybrid Filler System
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초록
본 연구에서는 하중 지지가 가능한 UHMWPE를 Core로 사용해 기계적 물성을 높이면서도 저항 변화 계측을 통해 변형률 측정이 가능한 동축 구조의 섬유형 센서의 구조를 설계하고 그 특성을 분석하였다. 특히 섬유형 센서의 전기 저항을 낮춰 구조 건전성 모니터링 시스템 구현의 유연성을 높이기 위해 MWCNT와 카본 블랙 (CB)를 혼합한 Hybrid filler system을 도입하였고 카본 블랙의 함량과 섬유형 센서의 구조에 따른 계측 특성을 평가하였다.
Abstract
In this work, dry-jet wet spun ultra-high molecular weight polyethylene (UHMWPE) fiber and multi-coating layer were used to enhance the mechanical properties of fiber sensor and sensing stability which is resistance and gauge factor. The shell parts of the fiber sensor, double polyurethane (PU) layer and MWCNT/Carbon black (CB) hybrid filler system, were formed on the UHMWPE core fiber by dip coating method. Electrical resistance and strain sensitivity of the fiber sensors were measured using a LCR meter. Finally, the prepared fiber sensor was embedded into glass fiber reinforced composite to evaluate load bearing capacity.
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