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Evaluation of Mechanical Properties of Carbon/Epoxy Composites Under In situ Low- and High-Temperature Environments

저온과 고온 환경 하에서 카본/에폭시 복합재의 기계적 물성 평가

  • Im, JaeMoon (Graduate School of Mechanical Design Engineering, Hanbat Nat'l Univ.) ;
  • Shin, KwangBok (Dept. of Mechanical Engineering, Hanbat Nat'l Univ.) ;
  • Hwang, Taekyung (Agency for Defense Development)
  • Received : 2014.12.22
  • Accepted : 2015.04.01
  • Published : 2015.06.01

Abstract

This paper aims to evaluate the variation in the mechanical properties of carbon/epoxy composites under in situ low- and high-temperature environments. In situ low- and high-temperature environments were simulated with temperature ranging from $-40^{\circ}C$ to $220^{\circ}C$ using an environmental chamber and furnace. The variation in the mechanical properties of the composites was measured for longitudinal and transverse tensile properties, in-plane shear properties and interlaminar shear strength. Under the low temperature of $-40^{\circ}C$, all mechanical properties increased moderately compared to the baseline properties measured at room temperature. The changes in the longitudinal tensile properties decreased moderately with increasing temperature. However, transverse tensile properties, in-plane shear properties and interlaminar shear strength each showed a significant drop due to the glass transition behavior of the matrix after $140^{\circ}C$. Notably, the tensile property value near $100^{\circ}C$ increased compared to baseline property value, which was an unusual occurrence. This behavior was a direct result of post-curing of the epoxy resin due to its exposure to high temperature.

Keywords

Carbon/Epoxy Laminate Composite;Low and High Temperature Environments;Mechanical Property

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