基于热力耦合层合板雷击损伤特性分析

为研究复合材料层合板在雷电流作用下的烧蚀损伤力学特性,建立复合材料雷击热力耦合有限元分析模型,与文献实验结果对比验证模型的有效性。根据Hashin三维失效准则编写用户材料子程序,分别得出层合板雷击烧蚀区域周围出现的力学损伤、各层力学损伤分布以及首层在不同方向上的应力分布,分析得出层合板的烧蚀损伤随雷电流持续时间的变化规律。结果表明:由于存在较高的温度梯度,导致层合板出现较大的热膨胀应力,进而导致层合板内部产生各种力学损伤,即基体开裂、分层及纤维断裂;雷击电流施加时间、峰值电流与温度场均对层合板烧蚀面积产生较大的影响。

Thermal coupling analysis of lightning strike laminates

In order to study the ablation damage mechanical properties of composite laminated plate under the action of lightning current,a thermal-mechanical coupling finite element analysis model of composite lightning strike was established.The validity of the model was verified by comparison with the experimental results.According to the three-dimensional Hashin failure criterion,the user material subroutines was programmed,and the mechanical damage around the lightning ablation area of the laminate,the mechanical damage distribution of each layer and the stress distributions of the first layer in different directions were obtained respectively.The analysis shows that the ablation damage of the laminates varies with the duration of the lightning current.The results show that due to the existence of a high temperature gradient,the laminated plate has have large thermal expansion stress,which leads to various mechanical damages inside the laminated plate,namely matrix cracking,delamination and fiber breakage.The lightning strike current application time,peak current and temperature field all have a great influence on the ablation area of the laminated plate.