含紧固件层合板雷击烧蚀损伤分析

为了研究含紧固件复合材料层合板在雷击电流作用下的烧蚀损伤规律,基于热电耦合建立含紧固件层合板的雷击有限元分析模型,并对雷击烧蚀损伤结果进行分析,与参考结果对比验证模型的合理性,并分析得到含紧固件层合板在不同峰值电流、紧固件尺寸、层合板宽度比条件下的烧蚀损伤结果,总结不同因素影响下烧蚀损伤面积的变化规律。结果表明:雷击峰值电流、紧固件的尺寸、层合板的宽度对含紧固件层合板烧蚀损伤面积具有极大的影响,相同的雷击电流波形,峰值150 kA雷击电流导致的烧蚀损伤面积是峰值50 kA的15.39倍;紧固件越小,烧蚀损伤面积越大,分层损伤面积越大,其中,当紧固件直径减小至1/2时,烧蚀损伤面积最大可增加4.97倍,分层损伤面积最大可增加1.91倍;层合板损伤面积随宽度的增加先增大后减小,最后趋于平稳,其中最大损伤面积与最小损伤面积的比值可达1.81倍,且比值随着紧固件直径的增加而增大。

Analysis of lightning ablation damage of fastener-containing laminates under different factors

In order to study the ablation damage law of composite laminates with fasteners under the action of lightning current,the lightning finite element analysis model of fastener-containing laminates was established based on thermoelectric coupling,and the results of lightning ablation damage were analyzed and tested.The results were compared with the validity of the model.The ablation damages of fastener-containing laminates under different peak currents,fastener sizes and laminate width ratios were analyzed,and the variations of ablation damage area under different factors were summarized.The results show that the peak current of the lightning strike,the size of the fastener,and the width of the laminate have great influences on the ablation damage areas of the fastener-containing laminates.The same lightning strike current waveform,the ablation damage area caused by lightning current with a peak value of 150 kA is 15.39 times that of 50 kA The smaller the fastener is,the larger the area of ablation damage is,and the larger the area of delamination damage is.Among them,when the diameter of the fastener is reduced by 2 times,the ablation damage area can be increased by 4.97 times,and the delamination damage area can be increased by 1.91 times.The damage area increases first and then decreases with the increase of the width,and finally tends to be stable.The ratio of the largest damage area to the minimum damage area can reach 1.81 times,and the ratio increases with the increase of the fastener diameter.