Flexural fatigue of short glass fiber reinforced a blend of polyphenylene ether ketone and polyphenylene sulfide |
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Authors: | Jiang Zhou Alberto D'Amore Yuming Yang Tianbai He Binyao Li Luigi Nicolais |
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Affiliation: | (1) Polymer Physics Laboratory, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 130022 Changchun, P.R. China;(2) Department of Materials and Production Engineering, University of Naples, Piazzale Tecchio 80, 80125 Napoli, Italy |
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Abstract: | Flexural fatigue tests were conducted on injection molded glass fiber reinforced a blend of polyphenylene ether ketone and polyphenylene sulfide composite using four-point bending with different stress ratios and different frequencies. The fatigue behavior of this material was described. The constructed S-N curves shift their trends obviously at the maximum cyclic stress being about 80% of the ultimate flexural strength. Examinations of failure surfaces for various loading conditions show that the fatigue failure mechanisms appear to be matrix yielding at high stresses and crack growth at low stresses. Analyses of the fatigue data at various stress ratios reveal that the data at low stress superimpose to form a single curve which is nearly linear when they are plotted as stress range versus number of cycles to failure in bilogarithmic axes, while the data at high stresses also converge to yield a single curve when they are plotted as (SmaxSrange)1/2 against specimen lifetimes (Smax is the maximum stress andSrange is the stress range). These results show that for the studied material the main factor influencing the lifetime is the stress range at low stresses and the parameter (SmaxSrange)1/2 at high stresses. Comparison of fatigue data in the frequency range of 0.89–7.0 Hz was made, no significant effect of frequency on the fatigue behavior is found. |
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Keywords: | flexural fatigue injection molded composite PEK-C/PPS blend S-N curves Stress ratios |
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