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A Study on Impact Damage Behavior of CF/Epoxy Composite Laminates

CF/Epoxy적층판의 충격손상거동에 관한 연구

  • Im, Gwang-Hui (Dept.of Semiconductor Electric Automotive Engineering, Woosuk University) ;
  • Sim, Jae-Gi (Dept.of Mechanical Engineering, Chosun University) ;
  • Yang, In-Yeong (Dept.of Mechanical Engineering, Chosun University)
  • 임광희 (우석대학교 반도체전기자동차공학부) ;
  • 심재기 (조선대학교 기계공학부) ;
  • 양인영 (조선대학교 기계공학부)
  • Published : 2002.05.01

Abstract

In this paper, static and fatigue bending strengths and failure mechanisms of CFRP (carbon fiber reinforced plastics) laminates having impact damages have been evaluated. Composite laminates used for this experiment are CF/EPOXY orthotropy laminated plates, which have two-interfaces $[0^0_ 4/90^0_4]_{ sym}$. A steel ball launched by the air gun collides against CFRP laminates to generate impact damages. The damage growth during bending fatigue test is observed by the scanning acoustic microscope (SAM) and also, the fracture surfaces were observed by using the SEM (scanning electron microscope). In the case of impacted-side compression, fracture is propagated from the transverse crack generated near impact point. On the other hand, fracture is developed toward the impact point from the edge of interface-B delamination in the case of impacted-side tension. Eventually, failure mechanisms have been confirmed based on the observed delamination areas and fracture surfaces.

Keywords

Impact Damage;FOD;CFRP;Delamination Area;Impact Energy;Residual Bending Fatigue Strength

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