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A Property of Crack Propagation at the Specimen of CFRP with Layer Angle

적층각도를 지닌 CFRP 시험편에서의 크랙전파 특성

  • Hwang, Gue Wan (Dept. of Mechanical Engineering, Graduate School, Kongju Univ.) ;
  • Cho, Jae Ung (Division of Mechanical & Automotive Engineering, Kongju Univ.) ;
  • Cho, Chong Du (Division of Mechanical Engineering, Inha Univ.)
  • 황규완 (공주대학교 대학원 기계공학과) ;
  • 조재웅 (공주대학교 기계자동차공학부) ;
  • 조종두 (인하대학교 기계공학과)
  • Received : 2016.05.12
  • Accepted : 2016.10.10
  • Published : 2016.12.01

Abstract

CFRP is the composite material manufactured by the hybrid resin on the basis of carbon fiber. As this material has the high specific strength and the light weight, it has been widely used at various fields. Particularly, the unidirectional carbon fiber can be applied with the layer angle. CFRP made with layer angle has the strength higher than with no layer angle. In this paper, the property of crack growth due to each layer angle was investigated on the crack propagation and fracture behavior of the CFRP compact tension specimen due to the change of layer angle. The value of maximum stress is shown to be decreased and the crack propagation is slowed down as the layer angle is increased. But the limit according to the layer angle is shown as the stress is increased again from the base point of the layer angle of $60^{\circ}$. This study result is thought to be utilized with the data which verify the probability of fatigue fracture when the defect inside the structure at using CFRP of mechanical structure happens.

Keywords

Compact Tension Specimen;Layer Angle;Total Deformation;Strain Energy;Equivalent Stress;Carbon Fiber Reinforced Plastic(C.F.R.P)

Acknowledgement

Supported by : 한국연구재단

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