碳纤维复合材料激光辐照温度场分布规律仿真

Simulation of temperature field distribution of carbon fiber composites under laser irradiation

基于碳纤维复合材料激光辐照理论,应用有限元方法,开展了碳纤维复合材料激光辐照温度场仿真分析。首先,研究了碳纤维复合材料激光辐照温度场分布规律,建立了不同位置线上的温度场表征方程,定量分析了辐照表面温度变化规律,并通过文献数据验证了有限元模型的有效性。然后,基于该模型,探究了复合材料板材不同铺层方向、不同光斑直径和不同激光功率下的温度场变化规律。结果表明:在不同铺层方向下,热影响区为椭圆形,[0]_(16)和[0/90]_(4S)板材的长轴方向为碳纤维0°铺层方向,而[45/90/-45/0]_(2S)板材的长轴方向为碳纤维45°铺层方向,且三者最高温度均约为1830℃;当光斑直径分别为6 mm、10 mm和14 mm时,热影响区面积逐步增大,而中心最高温度逐步降低,整个过程中最高温度分别为3347℃、2401℃和1838℃;在200 W、400 W和600 W激光功率下,板材中心温度随激光功率增大而增大,中心点最高温度分别为1750℃、2401℃和2789℃。

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 1830℃.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 3347℃,2401℃and 1838℃,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 1750℃,2401℃and 2789℃,respectively.