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Residual Strength of Fiber Metal Laminates After Impact

충격손상을 받은 섬유 금속 적층판의 잔류 강도 연구

  • 남현욱 (포항공과대학교 기계공학과) ;
  • 이용태 (포항공과대학교 기계공학과) ;
  • 정창규 (포항공과대학교 기계공학과) ;
  • 한경섭 (포항공과대학교 기계공학과)
  • Published : 2003.03.01

Abstract

Residual strength of fiber metal laminates after impact was studied. 3/4 lay up FML was fabricated using 4 ply prepreg, 2 ply aluminum sheets, and 1 ply steel sheet. Quasi isotropic ([0/45/90/-45]s) and orthotropic ([0/90/0/90]s) FRP were also fabricated to compare with FML. Impact test were conducted by using instrumented drop weight impact machine (Dynatup, Model 8250). Penetration load and absorbed energy of FML were superior to those of FRPs. Tensile tests were conducted to evaluate the residual strength after impact. Strength degradation of FML was less than that of FRP. This means that the damage tolerance of FML is excellent than that of FRP. Residual strength of each specimen was predicted by using Whitney and Nuismer(WN) Model. Impact damage area is assumed as a circular notch in WN model. Damage width is defined as the average of back face and top face damage width of each specimen. Average stress and point stress criterions were used to calculate the characteristic length. It is supposing that a characteristic length is a constant. The distribution of characteristic length shows that the assumption is reasonable. Prediction was well matched with experiment under both stress criterions.

Keywords

Impact Damage;Residual Strength;Fiber Metal Laminate;Fiber Reinforced Plastics

References

  1. Hitchcn, S.A and Kemp. R.M.J., 1995 'Effect of Stacking Sequence on Impact Damage,' Composites, Vol. 26. No.2. pp. 154-160 https://doi.org/10.1016/0010-4361(95)91384-H
  2. Wegman. Raymond F., 1989, Surface Preparation Techniques for Adhesive Bonding, Noyes Publications
  3. Trawinski, D., 1984, 'A Low Temperature Etchant Surface Preparation for Steel Adhesive Bonding,' SAMPE Quarterly, Vol. 16. No. 1. Oct., pp. 1-5
  4. Nam, H.W. Kim, Y.H. and Han. K.S., 2001. 'Damage Analysis of Fiber Metal Laminates using Acoustic Emission.' KSCM Journal. Vol. 14. No.5, pp.42-50
  5. Brown. W.F. Jr. and Srawley, John E.. 1966. 'Plane Strain Crack Toughness Testing of High Strength Metallic Materials,' ASTM STP 410, American Society for Testing and Materials
  6. Mar, J. 1976. 'Fracture and Fatigue in Bi-Materials.' in Mechanics of Composite Review, Air Force Materials Laboratory and Air Force Office of Scientific Research Technical Report, pp. 117-122
  7. Lekhnitskii, S.G., 1968 Anisotropic Plates. Translated from the Second Russian Edition by S.W. Tsai and T. Cheron, Gordon and Breach. Science Piblishers, Inc .. New York
  8. Lawcock, G.D. et al., 1997, 'Effects of Fiber/Matrix Adhesion on Carbon Fiber Reinforced Metal Laminates-I. Residual Strength,' Composites Science and Technology, Vol. 57, pp. 1609-1619 https://doi.org/10.1016/S0266-3538(97)00108-5
  9. Nuismer, R.J. and Whitney, J.M., 1975, 'Uniaxial Failure of Composite Laminate Containing Stress Concentrations.' In Fracture Mechanics of Composites, ASTM STP 593, American Society of Testing and Materials, pp. 117-142
  10. Peterson, R.E., 1974, Stress Concentration Factor, John Wiley & Sons, New York
  11. Lawcock, G.D., et al., 1997, 'Effects of Fiber/Matrix Adhesion on Carbon Fiber Reinforced Metal Larninates-II. Impact Behavior,' Composites Science and Technology. Vol. 57, pp. 1621-1628 https://doi.org/10.1016/S0266-3538(97)00094-8
  12. Lawcock, Glyn et al, 1997, 'Progressive Damage and Residual Strength of a Carbon Fiber Reinforced Metal Laminate,' J. of Composite Materials, Vol. 31. No.8, pp. 762-787 https://doi.org/10.1177/002199839703100802
  13. Zhi-He Jin and Yiu-Wing Mai, 1997, 'Residual Strength of an ARALL Laminate Containing a Crack,' J. of Composite Materials, Vol. 31, No.8, pp. 746-761 https://doi.org/10.1177/002199839703100801
  14. Asundi, A. and Choi, Alta Y.N., 1997 'Fiber Metal Laminates:An Advanced Material for Future Aircraft,' Journal of Materials Processing Technology, Vol. 63, pp. 384-394 https://doi.org/10.1016/S0924-0136(96)02652-0
  15. Yeh, J.R., 1988, 'Fracture Mechanics of Delamination in ARALL Laminates,' Engineering Fracture Mechanics, Vol. 30, No.6, pp. 827-837 https://doi.org/10.1016/0013-7944(88)90144-0
  16. Macheret, J., Teply, J.L., and Winter, E.F.M., 1989, 'Delamination Shape Effects in Aramid-Epoxy-Aluminum (ARALL) Laminates With Fatigue Cracks:' Polymer Composites, Vol. 10, No.5, pp. 322-327 https://doi.org/10.1002/pc.750100508
  17. Sun, C.T. , Dicken, A., and Wu, H.F., 1993,. Characterization of Impact Damage in ARALL Laminates,' Composites Science and Technology, Vol 49, pp. 139-144 https://doi.org/10.1016/0266-3538(93)90053-J
  18. Vlot, A., 1996, 'Impact Loading on Fiber Metal Laminates,' Int. J. Impact Engineering, Vol. 18, No.3. pp.291-307 https://doi.org/10.1016/0734-743X(96)89050-6
  19. Ritchie, R.O., Yu, Weikang, and Bucci, R.J., 1989, 'Fatigue Crack Propagation in ARALL Laminates: Measurement of the Effect of Crack-Tip Shielding from Crack Bridging,' Engineering Fracture Mechanics, Vol. 32, No.3, pp. 361-377 https://doi.org/10.1016/0013-7944(89)90309-3