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Enhanced fatigue life of carbon nanotube-reinforced epoxy composites

by: M. R. Loos, J. Yang, D. L. Feke, I. Manas-Zloczower
Polym Eng Sci, Vol. 52, No. 9. (2012), pp. 1882-1887, doi:10.1002/pen.23145  Key: citeulike:10599836

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Abstract

The effects of carbon nanotube (CNT) inclusion on cyclic fatigue behavior and the residual mechanical properties of epoxy composites after different degrees of fatigue have been studied. Tension–tension cyclic fatigue tests were conducted at various load levels (25–50 MPa) to establish the relationship between stress and the number of cycles to failure (S–N curves). The residual strength and modulus were measured after loading at 30 MPa for 5000, 15,000, and 25,000 cycles. The incorporation of a small amount of CNTs increased the fatigue life of epoxy in the high-cycle, low-stress-amplitude regime by 1550%. Micrographs indicate the key mechanisms for enhancement in fatigue life such as CNT crack-bridging and pullout. POLYM. ENG. SCI., 52:1882–1887, 2012. © 2012 Society of Plastics Engineers


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