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Evaluation of Variation in Residual Strength of Carbon Fiber Reinforced Plastic Plate with a Hole Subjected to Fatigue Load

피로하중에 의한 홀 노치 탄소섬유강화 복합재의 잔류강도변화 평가

  • 김상영 (성균관대학교 기계공학부) ;
  • 강민성 (성균관대학교 기계공학부) ;
  • 구재민 (성균관대학교 기계공학부) ;
  • 석창성 (성균관대학교 기계공학부)
  • Received : 2010.05.12
  • Accepted : 2010.08.12
  • Published : 2010.10.01

Abstract

CFRP (Carbon Fiber Reinforced Plastic) has received considerable attention in various fields as a structural material, because of its high specific strength, high specific stiffness, excellent design flexibility, favorable chemical properties, etc. Most products consisting of several parts are generally assembled by mechanical joining methods (using rivets, bolts, pins, etc.). Holes must be drilled in the parts to be joined, and the strength of the components subjected to static and fatigue loads caused by stress concentration must be decreased. In this study, we experimentally evaluated the variation in the residual strength of a holenotched CFRP plate subjected to fatigue load. We repeatedly subjected the hole-notched specimen to fatigue load for a certain number of cycles, and then we investigated the residual strength of the hole-notched specimen by performing the fracture test. From the results of the test, we can observe the initiation of a directional crack caused by the applied fatigue load. Further, we observed that the residual strength increases with a decrease in the notch effect due to this crack. It was evaluated that the residual strength increases to a certain level and subsequently decreases. This variation in the residual strength was represented by a simple equation by using a model of the decrease in residual strength for plain plate, which was developed by Reifsnider and a stress redistribution model for hole-notched plate, which was developed by Yip.

Keywords

CFRP;Fatigue;Residual strength;Hole-notch

Acknowledgement

Supported by : 한국연구재단

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