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

Abstract

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.

Keywords

• lightning strike
• composite laminate
• fastener
• ablation damage
• different factors