비파괴시험에 의한 GFRP Pipe의 평가

The Evaluation of GFRP Pipe by NDT Methods

  • 이주석 (한국기계연구소 비파괴시험연구실) ;
  • 조경식 (한국기계연구소 비파괴시험연구실) ;
  • 장홍근 (한국기계연구소 비파괴시험연구실) ;
  • 이승희 (계명대학교)
  • 발행 : 1989.05.30

초록

It is desirable to develop the effective NDT techniques to evaluate the strength of composite structures. In this study several of acoustic NDT techniques were applied to investigate useful parameters for evaluating the filament wound GFRP structures and following results were obtained. 1. Propagation velocity of stress wave to axial direction in the filament wound GFRP pipe depends on the effective modulus along the propagation direction and source location was parcticable from the a measured velocities. 2. By the application of acoustic emission techniques to GFRP pipe during hydraulic test, it was proven to be possible to detect the damage initiating pressure which could be evaluated nondestructively through the measuring of stress wave energy factor(SWEF). 3. The final failure pressure of GFRP was greatly influenced in the presence of pass through defects, and void-like defects were more dangerous than the laminar type defects.

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