Abstract: The tension–tension fatigue performance of T700/MTM46 composite laminates after hygrothermal aging was investigated and compared with those of virgin T700/MTM46 laminates. The most significant failure mode of the moisture-saturated fatigue specimens is still severe delamination, and the stiffness degradation of moisture-saturated fatigue specimens can be divided into two distinct stages. However, the hygrothermal conditions will aggravate the stiffness degradation of the composite laminates during fatigue. Damage evolution was studied by the edge view of the specimens. The degree of damage of the saturated specimens is more serious than that of the virgin specimens at the same percentage of fatigue life during the fatigue process, especially in the initial stage. The distribution of fatigue life in each stress level was determined. The p-γ-S-N surfaces were established to predict a reliable fatigue life. The results show that the reliable fatigue life of the moisture-saturated specimens is much lower than that of the virgin specimens under the same conditions. Although the hygrothermal environment does not show a significant effect on the static tensile properties of the T700/MTM46 composite laminates, the fatigue performance is significantly degenerated.

Key words: Carbon fiber reinforced polymer; Hygrothermal conditions; Fatigue performance; Damage evolution; p-γ-S-N surfaces

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