Fatigue of Quasi-Isotropic Composite Cylinders under Tension-Tension Loading

Abstract

Life prediction techniques for structural composites are based on test data obtained from coupon specimens. A tension fatigue life prediction methodology based on a through-thickness damage accumulation model is used to predict the fatigue failure of composite coupon specimens. Its applicability to thin-walled cylindrical specimens is in vestigated by comparing the fatigue behavior of composite coupon specimens to that of composite thin-walled cylindrical specimens. AS4/3501-6 graphite-epoxy coupon speci mens and thin-walled cylinder specimens with the same layup sequence of [0/ ± 45/90] _s were tested under static and fatigue loading conditions. Reasonably good agreement is found between the measured and predicted lives of the coupon specimens. Although the ultimate stresses of coupon and cylindrical specimens are different, it is observed that their fatigue lives at the same percentage of ultimate stress are nearly identical, independent of the coupon edge effect. It is concluded that the fatigue life prediction methodology for coupon specimens could be extended to estimate the fatigue life of the thin-walled graphite/epoxy composite cylinders used in this study.

Keywords

composite materials life prediction fatigue damage accumulation composite cylinders.

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References

Yang, J.N. and S. Du. 1978. J. of Com. Mat., 12:177-194.

Hahn, H.T. and R.Y. Kim 1976. J. of Com. Mat , 10:156-180.

Kim, R.Y. and W.J. Park. 1980. J. of Com. Mat., 14:69-79.

Chou, P.C. and R. Croman. 1979 Composite Materials: Testing and Design , ASTM STP 674, American Society for Testing and Materials , pp. 431-454.

Hahn, H.T. 1975. Composite Materials: Testing and Design, ASTM STP 674, American Society for Testing and Materials, pp. 297-311.

Hwang, W. and K.S. Han 1986. J. of Com. Mat., 20:154-165

Hwang, W. and K.S. Han. 1988. J. of Com. Mat., 22:129-145.

Tsai, G.C. , J.F. Doyle and C.T. Sun. 1987. J. of Com. Mat., 21.2-13.

Reifsnider, K.L. and R.D. Jamison 1982. Int. Journal of Fatigue , 4:187-198.

10.

Fradsen, R.R. and Y. Naerheim. 1983. J. of Com. Mat. , 17:105-113

11.

Reifsnider, K.L. 1984. Effects and Defects in Composite Materials, ASTM STP 836, American Society for Testing and Materials, pp. 21-55.

12.

Carlsson, L. 1986. Composite Materials. Fracture and Fatigue, ASTM STP 907, American Society for Testing and Materials, pp. 361-382.

13.

O'Bnen, T.K. 1988. Journal of Reinforced Plastics , 7.341-359.

14.

Caslim, M. , C. Zanotti and T.K. O'Bnen. 1987. Journal of Composites Technol. Res. , 9:121-130.

15.

O'Brien, T.K. 1982. Damage in Composite Materials , ASTM STP 755, pp 140-167.

16.

O'Brien, T.K. 1985. Delamination and Debonding of Materials, ASTM STP 876, pp. 282-297.

17.

O'Brien, T.K. 1990. Composite Materials: Testing and Design (Ninth Volume), ASTM STP 1059, S. P. Garbo , ed., Philadelphia: American Society for Testing and Materials, pp. 7-33.

18.

O'Bnen, T.K. , M. Rigamonti and M. Zanotti. 1989. Int. J. Fatigue, 11:379-393

19.

Krempl, E. and T.M. Niu 1982. J. of Com. Mat., 16:172-187.

20.

Francis, P.H. 1977. J. of Com. Mat., 11:488-501.

21.

Fujczak, R.K. 1978. Proceedings of 1978 International Conference on Composite Materials (Toronto, American Institute of Mining, Metallurgical and Petroleum Engineers Corp., pp. 635-647.

22.

Owen, M.J. and J.R. Griffiths. 1978. Journal of Materials Science, 13.1521-1537.

23.

Sun, C.T. and M.G. Manoharan. 1989. Composite Science and Technology, 34:365-377.