Compressive Behavior of Carbon/Epoxy Composites under High Pressure Environment-Strain Rate Effect

고압환경에서 탄소섬유/에폭시 복합재의 압축거동에 대한 연구-변형률 속도 영향

  • 이지훈 (경희대학교 대학원 기계공학과) ;
  • 이경엽 (경희대학교 테크노공학대학)
  • Published : 2004.04.01

Abstract

It is well-known that the mechanical behavior of fiber-reinforced composites under hydrostatic pressure environment is different from that of atmospheric pressure environment. It is also known that the mechanical behavior of fiber-reinforced composites is affected by a strain rate. In this work, we investigated the effect of strain rate on the compressive elastic modulus, fracture stress, and fracture strain of carbon/epoxy composites under hydrostatic pressure environment. The material used in the compressive test was unidirectional carbon/epoxy composites and the hydrostatic pressures applied was 270㎫. Compressive tests were performed applying three strain rates of 0.05%/sec, 0.25%/sec, and 0.55%/sec. The results showed that the elastic modulus increased with increasing strain rate while the fracture stress was little affected by the strain rate. The results also showed that the fracture strain decreased with increasing strain rate.

References

  1. Russell, A. J. and Street, K. N., 'Moisture and Temperature Effects on the Mode I and Mode II Interlaminar Fracture of Graphite/Epoxy Composites,' Key Engineering Materials, Vol. 37, pp. 199-208,1989 https://doi.org/10.4028/www.scientific.net/KEM.37.199
  2. Hooper, S. J. and Subramanian, R., 'Effects of Water and Jet Fuel Absorption on Mode I and Mode II Delamination of Graphite/Epoxy,' ASTM STP 1156, pp. 31-340, 1993
  3. Uematsu, Y., Kitamur, T. and Ohtani, R., 'Delamination Behavior of a Carbon -Fiber-Reinforced Thermoplastic Polymer at High Temperature,' Composite Science and Technology, Vol. 53, pp. 333-342, 1995 https://doi.org/10.1016/0266-3538(95)00005-4
  4. Weaver, C. W. and Williams, J. G., 'Deformation of Carbon-Epoxy composite under Hydrostatic Pressure,' J. of Materials Science, Vol. 10, pp. 1323-1333, 1975 https://doi.org/10.1007/BF00540822
  5. Parry, T. V. and Wronski, A. S., 'The Effect of Hydrostatic Pressure on the Tensile Properties of Pultruded CFRP,' J. of Materials Science, Vol. 20, pp. 2141-2147, 1981 https://doi.org/10.1007/BF01112298
  6. Wronski, A. S. and Parry, T. V, 'Compressive Failure and Kinking in the Uniaxially Allighned Glass-Resin Composite under Superimposed Hydrostatic Pressure,' J. of Materials Science, Vol. 20, pp. 3656-3662, 1982
  7. Shin, E. S. and Pae, K. D., 'Effects of Hydrostatic Pressure on the Torsional Behavior of Graphite/Epoxy Composites,' J. of Composite Materials, Vol. 26, pp. 462-485, 1992 https://doi.org/10.1177/002199839202600401
  8. Shin, E. S. and Pae, K. D., 'Effects of Hydrostatic Pressure on In-Plane Shear Properties of Graphite/Epoxy Composites,' J. of Composite Materials, Vol. 26, pp. 828-868, 1992 https://doi.org/10.1177/002199839202600604
  9. Rhee, K. Y. and Pae, K. D., 'Effects of Hydrostatic Pressure on the Compressive Properties of Laminated $0^{circ}$ Unidirectional Behavior of Graphite Fiber/Epoxy Thick Composites,' J. of Composite Materials, Vol. 29, pp. 1295-1307, 1995 https://doi.org/10.1177/002199839502901002
  10. Pae, K. D., 'Influence of Hydrostatic Pressure on Mechanical Behavior and Properties of Uni-Directional Graphite/Epoxy Matrix Thick-Composites,' Composites, Vol. 27, pp. 599-606, 1996 https://doi.org/10.1016/1359-8368(95)00041-0
  11. Zinoviev, P. A., Tsvetkov, S. V. 'Mechanical Properties of Unidirectional Organic-Fiber-Reinforced Plastics under Hydrostatic Pressure,' Composite Science and Technology, Vol. 58, pp. 31-39,1998 https://doi.org/10.1016/S0266-3538(97)00079-1
  12. Pae, K. D. and Carlson, K. S., 'The Combined Effects of Hydrostatic Pressure and Strain-Rate on the Compressive Properties of a Laminated, Multi-Directional Graphite/Epoxy Thick Composites,' J. of Composite Materials, Vol. 32, pp. 49-67, 1998 https://doi.org/10.1177/002199839803200103