Ablative mechanism of carbon-fiber/epoxy composite irradiated by repetition frequency laser

In this paper, the ablation mechanisms of carbon fiber reinforced E-51 epoxy composite irradiated by repetition frequency laser whose wavelength was 1 064 nm were studied, and the effects of maximum power density, irradiation time, frequency and pulse width on the thermal ablation rate were discussed. The thermal analysis results indicate that the resin matrix begins to ablate while the temperature of the composite surface reaches the pyrolysis temperature, which is as low as 300 ℃. The ablation of carbon fiber is caused by vaporization when the temperature reaches vaporization point, while the avoidance of carbon oxidation is attributed to the protection of pyrolysis gas. With the maximum power density or frequency increasing, the thermal ablation rate raises at first and then tends to a