Fatigue behaviour of composite materials is influenced by many parameters including test conditions. The paper presents results of fatigue tests performed on a carbon-fibre reinforced plastic (CFRP) bar at different temperatures and loading frequencies. A specimen in which the FRP bar is completely encased in concrete was successfully used to carry out fatigue tests under axial tension-tension loading. Test results show that the bar's surface temperature increases rapidly during the initial stage of test to stabilise for most of the fatigue life, and rises again abruptly in the final stage. Fatigue life was observed to decrease dramatically when the environmental temperature was increased from room temperature to 40 °C. Also, the logarithm of fatigue life was found to decrease approximately in proportion with the increase in loading frequency when the loading frequency was varied between 0.5 Hz and 8 Hz.
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