【摘要】 为了阐明平顶激光辐照下碳纤维增强聚醚醚酮（CF/PEEK）的熔凝特性，构建了方形平顶激光束的数学模型和CF/PEEK复合材料的几何模型，利用COMSOL有限元仿真软件，计算仿真了方形平顶激光辐照CF/PEEK的加热过程和停止加热后的冷却过程。其中，方形平顶激光功率密度为5 MW/m，平顶区域功率占比为94.37%，加热15 ms使CF/PEEK的表面温度达到370℃左右。在沿碳纤维轴向方向上，辐照区域内温差0.5℃以内，辐照区域边缘温差1℃左右；在沿碳纤维径向方向上，辐照区域内温度曲线呈现波浪状，波峰与波谷的温差为4℃，辐照区域边缘温差为5℃左右。在CF/PEEK凝固过程中，会有小型熔池区域出现，并且存在较大的固液共存区。更多还原

【Abstract】 In order to clarify the melting and solidification characteristics of CF/PEEK irradiated by a flat top laser, the mathematical model of the square flat top laser beam and the geometric model of CF/PEEK composites are constructed in this paper. The heating process of the square flat top laser irradiated CF/PEEK and the cooling process after the heating is stopped are calculated and simulated using the COMSOL finite element simulation software. The square flat top laser power density is 5 MW/m, and the power ratio of the flat top area is 94. 37%. The surface temperature of CF/PEEK reaches about 370 ℃ after heating for 15 ms. The temperature difference within the irradiation area along the axial direction of carbon fiber is within 0. 5 ℃, and the temperature difference at the edge of the irradiation area is about 1 ℃. The temperature curve in the irradiation area along the radial direction of the carbon fiber is wavy, with the temperature difference between the wave crest and the wave trough of 4 ℃, and the temperature difference at the edge of the irradiation area of about 5 ℃. In CF/PEEK solidification process, there will be small molten pool area and large solid-liquid coexistence area.更多还原