激光切割碳纤维复合材料的温度场仿真

为了揭示激光切割碳纤维复合材料过程中温度场的分布规律、材料对能量的吸收和传递规律以及热影响区的形成机制，采用碳纤维复合材料为研究对象，建立激光切割碳纤维复合材料的多物理场模型，计算仿真了激光切割碳纤维复合材料过程中温度场分布及激光参量对碳纤维复合材料温度和热影响区影响规律，得到了激光切割碳纤维复合材料过程中的3维温度场分布。结果表明，激光切割过程中，碳纤维复合材料表面温度场近似为椭圆形，且碳纤维复合材料中能量的传递和扩散主要沿着碳纤维铺设方向；激光功率20W、光斑半径100μm、切割速率50mm/s的激光沿垂直于碳纤维铺设方向切割时，激光光斑作用处碳纤维温度远低于树脂层温度；随着切割光斑半径和激光功率的增加，碳纤维复合材料中最高温度逐渐增加，热影响区逐渐增大；随着切割速率的增加，碳纤维复合材料中最高温度逐渐减小，热影响区逐渐变小。该研究为了解激光切割碳纤维复合材料过程中的热损伤机理及材料高质高效的加工提供了一定的理论指导。

Temperature field simulation of laser cut carbon fiber reinforced plastics

In order to reveal the distribution of temperature field, the absorption and transfer of energy, and the formation mechanism of heat affected zone during laser cutting carbon fiber reinforced plastics, the carbon fiber reinforced plastics was chosen as the research object, and the multiphysics model of laser cutting carbon fiber reinforced plastics was established. The temperature field distribution during laser cutting and the influence of laser parameters on carbon fiber reinforced plastics temperature and heat affected zone were calculated. The 3-D temperature field distribution during laser cutting carbon fiber reinforced plastics was then obtained. The results show that the surface temperature field of carbon fiber reinforced plastics is approximately elliptical during laser cutting.The energy transfer and diffusion in carbon fiber reinforced plastics are mainly along the direction of carbon fiber laying. When the laser power is 20W, the spot radius is 100μm, and the laser with a cutting speed of 50mm/s is cut perpendicular to the carbon fiber laying direction, the carbon fiber temperature at the laser spot is much lower than the temperature of the resin layer. With the increase of spot radius and laser power, the maximum temperature in carbon fiber reinforced plastics increases gradually, and the heat affected zone gradually increases. With the increase of cutting speed, the maximum temperature in carbon fiber reinforced plastics gradually decreases, and the heat affected zone gradually becomes smaller. This study provides theoretical guidance for understanding the thermal damage mechanism of laser cutting carbon fiber reinforced plastics and the high quality and efficient processing of materials.