Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)
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Damage of Composite Laminates by Low-Velocity Impact

저속충격에 의한 복합재료 적층판의 손상

  • AHN SEOK-HWAN (College of Engineering, Pukyong National University) ;
  • KIM JIN-WOOK (Korea Institute of Machinery and Materials) ;
  • DO JAE-YOON (Busan Polytechnic college) ;
  • KIM HYUN-SOO (College of Engineering, Pukyong National University) ;
  • NAM KI-WOO (College of Engineering, Pukyong National University)
  • Published : 2005.02.01
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Abstract

The study investigated the nondestructive characteristics of damage, caused by law-velocity impact, on symmetric cross-ply laminates, composed of [0o/90o]16s, 24s, 32s, 48s. The thickness of the laminates was 2, 3, 4 and 6 mm, respectively. The impact machine used, Model 8250 Dynatup Instron, was a drop-weight type that employed gravity. The impact velocities used in this experiment were 0.75, 0.90, 1.05, 1.20 and 1.35 m/sec, respectively. Both the load and the deformation increased when the impact velocity was increased. Further, when the load increased with the laminate thickness in the same impact velocity, the deformation still decreased. The extensional velocity was quick, as the laminate thickness increased in the same impact velocity and the impact velocity increased in the same laminate thickness. In the ultrasonic scans, the damaged area represented a dimmed zone. This is due to the fact that the wave, after the partial reflection by the deflects, does not have enough energy to touch the opposite side or to come back from it. The damaged laminate areas differed, according to the laminate thickness and the impact velocity. The extensional velocities are lower in the 0o direction and higher in the 90o direction, when the size of the defect increases. However, it was difficult to draw any conclusion for the extensional velocities in the 45o direction.

Keywords

References

  1. 남기우, 문창권 (2002). 'CFRP적층 형태에 따른 파괴시 음향방출 신호특성', 한국해양공학회지, 제16권 제2호, pp 67-71
  2. 남기우, 안석환, 이상기, 김현수, 문창권(2001). '시간-주파수 해석법에 의한 CFRP의 파괴 거동', 비파괴검사학회지, 제21권, 제1호, pp 39-45
  3. 안석환, 남기우 (2001). '음향방출 및 초음파시험을 이용한 CFRP 시험편의 파괴 거동 해석', 비파괴검사학회지, 제21권, 제3호, pp 251 - 260
  4. Abrate, A (1994). 'Impact on Laminated Composite : Recent Advances', Applied Mechanics Review, ASME, Vol 47, No 11, pp 517 - 544 https://doi.org/10.1115/1.3111065
  5. Abrate, A (2001). 'Modeling of Impacts on Composite Structures', Composite Structures, Vol 51, pp 129-138 https://doi.org/10.1016/S0263-8223(00)00138-0
  6. Cantwell, W.J. and Morton, J. (1991). 'The Impact Resistance of Composite Materials - A Review', Composites, Vol 22, No 5, pp 347-362 https://doi.org/10.1016/0010-4361(91)90549-V
  7. Chang, Z. and Mal, A.K. (1998). 'Wave Propagation in a Plate with Defects', Review of Progress in QNDE, Vol 17, pp 121-128
  8. Mal, A.K., and Rajapakse, YD.S. (1990), 'Impact Response and Elastodynamics of Composite Materials', ASME Publications, AMD-Vol 116
  9. Prosser, W.H. (1996). 'Advanced AE Techniques in Composite Materials Research', J. of Acoustic Emission, Vol 14, pp 5 1-511