This is the first study on the fatigue tensile performance of a novel hybrid composite made as Type A (i.e. woven carbon fibers plus unidirectional flax fibers [WC2/0F12/WC2]) or Type B (i.e. woven carbon fibers plus oblique flax fibers [WC2/(±45)F6S/WC2]) in epoxy resin. Composite plates were examined under constant strain amplitude using conventional fatigue tests and constant stress amplitude using thermographic stress analysis at 5 Hz cycling with a constant amplitude ratio of 0.1. For conventional fatigue, the max strain εmax versus cycles to failure Nf curve for Type A was log (Nf) = 9.7–588.2εmax, while for Type B it was log (Nf) = 14.9–1000εmax; neither material had a true endurance limit since curves never became horizontal. For thermographic stress analysis, high-cycle fatigue strength for Type A was 231.7 MPa (i.e. 56% of ultimate tensile stress σut), while for Type B it was 203.2 MPa (i.e. 60% of σut).
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