Abstract
Experimental results are presented for the lifetime in creep rupture of single graphite fibres. The fibres were extracted from unsized, Hercules IM6 tows and were tested at a gauge length of 5 cm under standard ambient conditions (21°C, 50% r.h.). The results were analysed using a theoretical model which embodies Weibull distributions for both strength and lifetime, and a power-law relationship for lifetime against stress level. Using maximum likelihood techniques, the Weibull shape parameter values for strength and lifetime were found to be about 4.6 and 0.015, respectively, and the power-law exponent was about 300, but could be as low as 250. As expected, this exponent was close in value to the ratio of the respective Weibull shape parameter values. Using the Kaplan-Meier estimator for censored data, the goodness of fit of the model to the data was found to be excellent.
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Farquhar, D.S., Mutrelle, F.M., Phoenix, S.L. et al. Lifetime statistics for single graphite fibres in creep rupture. J Mater Sci 24, 2151–2164 (1989). https://doi.org/10.1007/BF02385436
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DOI: https://doi.org/10.1007/BF02385436