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Change of Mechanical Properties of Injection-Molded Glass-Fiber-Reinforced Plastic (GFRP) According to Temperature and Water Absorption for Vehicle Weight Reduction

차량 경량화를 위한 사출성형 유리섬유강화플라스틱의 온도 및 수분 흡수에 따른 기계적 물성 변화

  • Chun, Doo-Man (School of Mechanical Engineering, Univ. of Ulsan) ;
  • Ahn, Sung-Hoon (School of Mechanical and Aerospace Engineering, Seoul Nat'l Univ.)
  • 천두만 (울산대학교 기계공학부) ;
  • 안성훈 (서울대학교 기계항공공학부)
  • Received : 2012.06.25
  • Accepted : 2012.11.08
  • Published : 2013.02.04

Abstract

Owing to the global energy crisis, studies have strongly focused on realizing energy savings through vehicle weight reduction using light metal alloys or polymer composites. Polymer composites afford many advantages including enabling the fabrication of complex shapes by injection molding, and glass and carbon fibers offer improved mechanical properties. However, the high temperature in an engine room and the high humidity during the rainy season can degrade the mechanical properties of the polymer. In this study, the mechanical properties of injection-molded glass-fiber-reinforced polymer were assessed at a temperature of $85^{\circ}C$ and the maximum moisture absorption conditions. The result showed a 23% reduction in the maximum tensile strength under high temperature, 30% reduction under maximum moisture absorption, and 70% reduction under both heat and moisture conditions. For material selection during the design process, the effects of high temperature and high humidity should be considered.

Keywords

Injection Molding;Glass Fiber Reinforced Plastics;Mechanical Property;Temperature;Water Absorption

Acknowledgement

Supported by : 울산대학교

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