This study investigates the effects of thermal-oxidative aging on the mechanical properties of three-dimensional woven carbon fiber composite materials with pre-existing damage. The aging mechanisms and changes in mechanical properties were analyzed under aging conditions of 70℃, 120℃, and 180℃. The materials were subjected to thermal-oxidative aging tests, and the following analyses were conducted: mass loss rate, SEM microstructure observation, Fourier-transform infrared spectroscopy (FT-IR), dynamic mechanical analysis (DMA), as well as open-hole tensile strength tests. The results indicate that the extent of mass loss and interface debonding increases with higher thermal-oxidative aging temperatures. Higher temperatures also lead to chemical reactions within the resin matrix. Moreover, the open-hole tensile strengths decrease with increasing aging temperature.
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