Original Article
  • Interfacial Damage Sensing and Evaluation of Carbon and SiC Fibers/Epoxy Composites with Fiber-Embedded Angle using Electro-Micromechanical Technique
  • Joung-Man Park, Sang-Il Lee, Jin-Woo Kong, Tae-Wook Kim
  • Electro-Micromechanical 시험법을 이용한 섬유 함침 각에 따른 탄소와 SiC 섬유강화 에폭시 복합재료의 계면 손상 감지능 및 평가
  • 박종만(경상대학교 응용화학공학부 고분자공학전공), 이상일(University of Nebrasca-Lincoln, U.S.A.), 공진우(한국기계연구원 복합재료그룹), 김태욱(한국기계연구원 복합재료그룹)
Abstract
Interfacial properties and electrical sensing for fiber fracture in carbon and SiC fibers/epoxy composites were investigated by the electrical resistance measurement and fragmentation test. As fiber-embedded angle increased, the interfacial shear strength (IFSS) of two-type fiber composites decreased, and the elapsed time takes long until the infinity in electrical resistivity. The initial slope of electrical resistivity increased rapidly to the infinity at higher angle, whereas electrical resistivity increased gradually at small angle. Furthermore, both fiber composites with small embedded angle showed a fully-developed stress whitening pattern, whereas both composites with higher embedded angle exhibited a less developed stress whitening pattern. As embedded angle decreased, the gap between the fragments increased and the debonded length was wider for both fiber composites. Electro-micromechanical technique could be a feasible nondestructive evaluation to measure interfacial sensing properties depending on the fiber-embedded angle in conductive fiber reinforced composites.

Interfacial properties and electrical sensing for fiber fracture in carbon and SiC fibers/epoxy composites were investigated by the electrical resistance measurement and fragmentation test. As fiber-embedded angle increased, the interfacial shear strength (IFSS) of two-type fiber composites decreased, and the elapsed time takes long until the infinity in electrical resistivity. The initial slope of electrical resistivity increased rapidly to the infinity at higher angle, whereas electrical resistivity increased gradually at small angle. Furthermore, both fiber composites with small embedded angle showed a fully-developed stress whitening pattern, whereas both composites with higher embedded angle exhibited a less developed stress whitening pattern. As embedded angle decreased, the gap between the fragments increased and the debonded length was wider for both fiber composites. Electro-micromechanical technique could be a feasible nondestructive evaluation to measure interfacial sensing properties depending on the fiber-embedded angle in conductive fiber reinforced composites.

Keywords: Electrical damage sensing, Nondestructive test, Acoustic emission, Interfacial shear strength (IFSS), Stress transfer

Keywords: 전기적 손상감지능, 비파괴시험, 음향방출, 계면전단강도, 응력전달

This Article

  • 2003; 16(2): 68-73

    Published on Apr 30, 2003

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