Abstract: Based on the theory of laser irradiation of carbon fiber composites, the temperature field of carbon fiber composites was simulated by finite element method. Firstly, the distribution law of laser irradiation temperature field of carbon fiber composites was studied, and the temperature field characterization equation of different position lines was established. The variation law of irradiated surface temperature was quantitatively analyzed, and the validity of finite element model was verified by literature data. Then, based on the model, the temperature field changes of the composite sheet under different layering directions, different spot diameters and different laser power were investigated. The results show that the heat affected zone is elliptical under different layering directions, and the long axis direction of [0]₁₆ and [0/90]_4S plates is the 0° layering direction of carbon fiber, while the long axis direction of [45/90/-45/0]_2S plates is the 45° layering direction of carbon fiber, and the maximum temperature of the three plates is about 1 830 ℃. When the spot diameter is 6 mm, 10 mm and 14 mm, the area of the heat affected zone gradually increases, while the maximum temperature of the center gradually decreases, and the maximum temperature in the whole process is 3 347 ℃, 2 401 ℃ and 1 838 ℃, respectively. At 200 W, 400 W and 600 W laser power, the center temperature of the plate increases with the increase of laser power, and the maximum temperature of the center point is 1 750 ℃, 2 401 ℃ and 2 789 ℃, respectively.

Key words: carbon fiber composites, laser irradiation, temperature field, finite element, characterization equation