Transactions of the Korean Society of Mechanical Engineers (대한기계학회논문집)

The Korean Society of Mechanical Engineers (대한기계학회)
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A study on fracture toughness evaluation and crack growth behavior in FRP (SMC material)

FRP(SMC재)의 균열成長 擧動과 破壞인성 평가에 관한 연구

  • 김정규 (한양대학교 공대 기계설계공학과) ;
  • 박진성 (한양대학교 대학원)
  • Published : 1989.05.01
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Abstract

Using the SMC(sheet moulding compound) composite material consisting of E-glass chopped strand mat and unsaturated polyester resin, three-point bending tests are carried out to evaluate the elasto-plastic fracture toughness by means of R curve. The crack extension is experimentally observed with the ink staining method. The point of stable crack growth is discussed in consideration of the load-load point displacement curve, the damage behavior of the notch vicinity, and the R-curves. The damage zone of the notch vicinity was composed of the initiation and growth of subcracks as well as those of the main crack. The point of stable crack growth can be defined as the inflection point in the R curves and its point also concurrs with the proportional limit on the load-load point displacement curve.

본 연구에서는 FRP의 파괴인성평가를 위한 기초적인 자료를 얻기 위하여 FRP 중에서도 널리 사용되고 있는 SMC재를 준비하고 3점 굽힘시험을 실시하여 노치선단에서의 손상거동 및 균열진전저항유선으로부터 안정파괴개시점을 검토하였다.

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