Interlaminar Normal Stress Effects in Cylindrical Tubular Specimens of Graphite/Epoxy [±45]s Composites

  • An, Deuk Man (Mechanical Engineering Department, Pusan National University)
  • Received : 2017.10.31
  • Accepted : 2017.12.27
  • Published : 2017.12.31


The thin-walled cylindrical tubes are frequently used for the evaluation of fatigue property of composites. But the curvature of the tubular specimen induces interlaminar normal stress which may affect the fatigue property. In this paper interlaminar normal stress effect on the fatigue behaviour of thin-walled graphite/epoxy tubes $[{\pm}45]_s$ composites was studied experimentally. It was concluded that the interlaminar normal stress induced by the curvature of the cylinder has no discernible effect on the fatigue life. But excessive internal pressure can produce the stiffness increase and this affects the fatigue life of the cylindrical tubular composite.


Supported by : Pusan National University


  1. An, Deukman, "Cumulative Damage Theory in Fatigue of Graphite/Epoxy ${\pm}$45]s Composites," Composite Research, Vol. 28, No. 4, 2015, pp. 182-190.
  2. Seon, G., Makeev, A., Nikishkov, Y., and Lee, E., "Effects of Defects on Interlaminar tensile Fatigue Behavior of Carbon/ Epoxy Composites," Composites Science and Technology, Vol. 89, 2013, pp. 194-201.
  3. Tsai, S.W., and Hahn, H.T., Introduction to Composite Materials, Technomic Publishing Co., Inc. 1980.
  4. Salkind, M.J., "Fatigue of Composites," Composite Materials: Testing and Design (Second Conference). ASTM STP 497, American Society for Testing Materials, 1972, pp. 143-169.
  5. Niu, T.M., Biaxial Fatigue of Graphite/Epoxy $[{\pm}45]_{s}$ Tubes, Ph.D. Thesis, Rensselaer Polytechnic Institute, 1983.
  6. Ayar, T., Biaxial Fatigue of Graphite/Epoxy $[0/{\pm}45]_{s}$ Tubes, master's thesis, Rensselaer Polytechnic Institute, 1984.
  7. Crandall, S.H., Dahl, N.C., and Lardner, T.J., An Introduction to the Mechanics of Solids, 2nd ed., McGraw-Hill, New York, 1972.