应用有限元软件建立三维脉冲激光辐照芳纶纤维复合材料的物理模型, 获得了芳纶纤维复合材料的温度场分布及其变化规律。结果显示, 随着激光功率密度的增大, 芳纶纤维复合材料的温度逐渐升高; 不同激光功率密度作用下的芳纶纤维复合材料的温度在光斑中心处最大并随着各位置到中心距离的增大而减小。为验证数值分析模型并更好的研究芳纶纤维复合材料的热损伤规律, 试验过程中选用不同功率密度的纳秒脉冲激光辐照芳纶纤维复合材料。研究结果表明, 数值模拟温度与实验温度吻合较好, 最大相对误差为12.49%; 随着激光功率密度的增大, 芳纶纤维复合材料的焦化碳化面积逐渐增大, 熔融深度随之加深。

The physical model of three-dimensional pulse laser irradiation aramid fiber composites is established by finite element software. And the temperature field distribution and the change rules of aramid fiber composites are obtained. The results show that with the increasing of laser power density, the temperature of aramid fiber composites rises gradually. The temperature value of the composites acted by different laser power density is the maximum at facula center, and it decreases with the increasing of the distance between different points and center point. For verifying numerical analysis model and researching the thermal damage rule of aramid fiber composites, nanosecond pulse laser irradiation aramid fiber composites with different power density is chosen during the experiment. The research results show that numerical simulation temperature better accords with experimental temperature and the maximum relative error is 12.49%. With the increasing of laser power density, the coking and carbonized areas of aramid fiber composites increase gradually and the melt depth will gradually deepened.