J. Zhou et al., FLEXURAL FATIGUE BEHAVIOR OF INJECTION-MOLDED COMPOSITES BASED ON POLY(PHENYLENE ETHER KETONE), Journal of applied polymer science, 65(10), 1997, pp. 1857-1864
Flexural fatigue tests were conducted on injection-molded short fiber
composites, carbon fiber/poly(phenylene ether ketone) (PEK-C) and glas
s fiber/PEK-C (with addition of polyphenylene sulfide for improving ad
hesion between matrix and fibers), using four-point bending at stress
ratio of 0.1. The fatigue behavior of these materials was presented. B
y comparing the S-N curves and analyzing the fracture surfaces of the
two materials, the similarity and difference of the failure mechanisms
in the two materials were discussed. It is shown that the flexural fa
tigue failure of the studied materials is governed by their respective
tensile properties. The matrix yielding is main failure mechanism at
high stress, while at lower stress the fatigue properties appear fiber
and interface dominated. (C) 1997 John Wiley & Sons, Inc.