Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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An Experimental Study on the Flexural Fatigue Behavior of Glass fiber Reinforced Plastec Pipes

유리섬유 보강 플라스틱관의 휨 피로 거동에 관한 실험적 연구

  • Jang, Dong-Il (Dept. of Civil and Engineering, Hanyang University) ;
  • Go, Jae-Won (Dept. of Civil and Engineering, Hanyang University)
  • 장동일 (한양대학교 토목공학과) ;
  • 고재원 (한양대학교 토목공학과)
  • Published : 1994.04.01
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Abstract

In the comparison result of residual strain calculated from the load-strain curve under the repeated loading cycles, it was found that the larger the laminates is, the larger the stiffness of GFRP pipes under fatigue load is. This phenomenon is true until the fatigue failure. According to the S-N curves drawn by the regression analysis on the fatigue test results, the fatigue strength for percentage of the static ultimate strength increases by increasing the laminates of GFRP pipes. The fatigue strength for 2, 000, 000 repeated loading cycles In GFRP pipes with the laminates varing 15, 25, 35 shows 75.2%, 79.5%, 84.2% on the static ultimate strength, respectively.

반복회수에 대한 하중-변형률 선도로부터 구산 잔류변형률의 비교 결과에서 피로하중하의 GFRP관의 강성은 GFRP관의 유리섬유의 적층수가 클수록 크게 나타났으며, 이러한 현상은 피로파괴 직전까지 나타났다. 아울러 본 피로실험 결과를 회귀분석하여 구한 S-N선도에 의하면 정적극한강도 백분율에 대한 피로강도는 GFRP관의 유리섬유 적층수가 증가할수록 증가하였으며, 유리섬유의 적층수가 15, 25, 35층인 GFRP관의 반복회수 200만회에 대한 피로강도는 정적극한강도는 각각 약 75.2%, 79.5%, 84.2%로 나타났다.

Keywords

References

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