We propose a new, alternative approach to predict lightning mechanical damage in AS4/3506 carbon/epoxy laminates using equivalent air blast overpressure (ABO). Three lightning mechanical damage models are presented: i) the Shock Wave Overpressure (SWO) model, ii) the Conventional Weapons Effects Program (CONWEP) ABO model, and iii) the Coupled Eulerian-Lagrangian (CEL) ABO model. SWOs were determined from classical shock wave theory and the arc channel energy balance equation, and directly applied within pre-described arc channel areas. ABOs in the CONWEP and CEL models were calculated for equivalent TNT explosions and applied over the entire laminate surface. In contrast to the SWO and CONWEP models, the CEL model simulated the coupled fluid-structure interactions of the blast waves with the composite structures. Although the fundamental physics was different, both SWO and ABO induced similar dynamic structural responses and damage behavior within AS4/3506 carbon/epoxy laminates. The fiber and matrix failure, predicted using Hashin's four failure criteria, was not imminent at any of these peak currents. This implies that purely mechanical in-plane damage is unlikely to occur and thus is not a major concern for lightning strikes. This study shows that the ABO models can be used to predict lightning mechanical damage in composite structures as an alternative to a complex SWO model.

我们提出了一种新的替代方法，该方法使用等效的鼓风超压（ABO）来预测AS4 / 3506碳/环氧树脂层压板中的闪电机械损伤。提出了三种雷电机械损伤模型：i）冲击波超压（SWO）模型，ii常规武器效果程序（CONWEP）ABO模型，和iii）耦合的欧拉－拉格朗日（CEL）ABO模型。SWO由经典冲击波理论和电弧通道能量平衡方程确定，并直接应用于上述电弧通道区域。针对等效的TNT爆炸计算CONWEP和CEL模型中的ABO，并将其应用于整个层压板表面。与SWO和CONWEP模型相反，CEL模型模拟了爆炸波与复合结构的耦合流固耦合。尽管基本物理原理不同，但是SWO和ABO都在AS4 / 3506碳/环氧树脂层压板中引起了相似的动态结构响应和破坏行为。使用Hashin的四个故障标准预测的光纤和基体故障在这些峰值电流中都不会很快出现。这意味着纯机械面损坏不太可能发生，因此不是雷击的主要问题。这项研究表明，作为复杂SWO模型的替代方案，ABO模型可用于预测复合结构中的闪电机械损伤。