CFRP层合板雷击烧蚀损伤模拟的电流加载方式分析

Analysis of current loading mode for lightning strike ablation damage simulation of CFRP laminates

通过改进加载方式减小数值模拟与试验结果误差对于提高仿真准确性具有重要意义。本文探究复合材料层合板在不同形式雷击电流下的烧蚀损伤特性,改进电弧半径扩展公式,建立适用于雷击过程的电弧扩展半径数值模型;基于ABAQUS建立碳纤维增强塑料(CFRP)层合板有限元模型,分析不同电流加载方式下的烧蚀损伤情况。结果表明:建立的有限元模型能够模拟CFRP层合板雷击烧蚀损伤;扩展移动加载造成的损伤面积、损伤深度和损伤体积与试验结果对比误差均约为7%,仿真结果与试验结果具有良好的一致性,模拟复合材料雷击烧蚀损伤时应同时考虑电流扩展和移动的影响。

It is of great significance to improve the simulation accuracy by improving the loading method to reduce the error between the numerical simulation and the test results.The ablation damage characteristics of composite laminates under different forms of lightning current are explored in this paper,the arc radius expansion formula is improved,and a numerical model of arc expansion radius suitable for lightning strike process is established.A finite element model of carbon-fiber reinforced plastics(CFRP)laminate is established based on ABAQUS,and the ab-lation damage under different current loading modes is analyzed.The results show that the established finite ele-ment model can simulate the lightning strike ablation damage of CFRP laminates.Compared with other loading modes,the damage area,damage depth and damage volume caused by extended moving loading are in good agree-ment with the test results.The effects of current expanding and movement should be taken into account while simu-lating lightning strike ablation damage of composite materials.