复合材料层合板雷击烧蚀损伤影响因素分析

Analysis of damage influence factors on ablation damage of composite laminates subjected lightning strike

通过复合材料层合板雷电流冲击的热-电耦合分析,建立复合材料层合板烧蚀的三维有限元模型,研究复合材料层合板在不同材料属性下的瞬态热传递和热解作用规律,进行雷击复合材料损伤机理和损伤模式分析,根据烧蚀后的温度分布评估雷电流烧蚀尺寸变化规律,得出复合材料烧蚀损伤与材料性能的关系,结果表明电导率对烧蚀形貌的发展变化产生很大影响,热导率变化时烧蚀结果并没有发生显著改变。比热只有增加到一定程度烧蚀损伤才会降低。

A three dimensional finite element model was constructed after a coupled thermal-electrical analysis of composite laminates subjected to lightning strikes. The mechanism of the transient heat transfer and heat decomposition of composite laminates with different material properties was studied. The damage mechanism and damage pattern of composite laminates subjected to lightning strike was analyzed. The propagation of the ablation size was evaluated through the temperature distribution of the composite laminates subjected to lightning strike. The relationship between the ablation damage and material properties of the composite laminates was acquired. Results show that the propagation of ablation configuration is influenced significantly by the electrical conductivity. The ablation damage is not changed notably when the thermal conductivity is changed. The ablation damage decreases only when the specific heat is increased to a certain extent.