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Understanding how arc attachment behaviour influences the prediction of composite specimen thermal loading during an artificial lightning strike test

机译：了解在人工雷击测试过程中电弧附着行为如何影响复合材料样品的热负荷预测

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摘要

High speed image analysis of experimental lightning strike testing on composite specimens has demonstrated complex time-dependent arc attachment behaviour. To date simulation studies of lightning strike direct effects on composite materials have overlooked or idealised the observed arc attachment behaviour. This is significant as these preceding studies have also demonstrated joule (resistive) heating is a major contributor to composite material damage and thus the application of the current load is critically important. The objective of this paper is to quantify how arc attachment behaviour influences the prediction of composite specimen thermal loading during a simulated lightning strike test. This is achieved through a simulation study modelling experimental arc attachment behaviours referenced in the literature. The simulation results are compared with measured test specimen damage. The results quantify for the first time the significance of arc attachment behaviour, demonstrating how realistic representation of arc expansion and arc movement can alter the predicted thermal loading and generate thermal damage patterns comparable to measured experimental damage.
机译：对复合材料标本进行实验性雷击测试的高速图像分析显示出复杂的时间依赖性电弧附着行为。迄今为止，雷击的模拟研究对复合材料的直接影响已经忽略或理想化了观察到的电弧附着行为。这是很重要的，因为这些先前的研究还证明了焦耳（电阻）加热是造成复合材料损坏的主要因素，因此施加电流负载至关重要。本文的目的是量化电弧附着行为如何在模拟雷击测试过程中影响复合材料样本的热负荷预测。这是通过对文献中引用的实验性电弧附着行为进行建模的模拟研究来实现的。将模拟结果与测得的试样损伤进行比较。结果首次量化了电弧附着行为的重要性，证明了电弧膨胀和电弧运动的逼真的表示如何改变预测的热负荷并产生与测量的实验损伤相当的热损伤模式。

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