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Delamination analysis of CFRP laminates exposed to lightning strike considering cooling process

机译：考虑冷却过程的遭受雷击的CFRP层压板的分层分析

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This study examined the damage mechanisms of CFRP laminates exposed to lightning strike. Simulated lightning current testing elucidated the CFRP laminate damage behavior. Thermogravimetric analysis results revealed the pyrolysis behavior. Coupled thermal-electrical analysis, heat transfer analysis, and stress analysis using cohesive elements were conducted using finite element method (FEM) incorporating a CFRP thermal decomposition model. Delamination was simulated using a cohesive-element model. As results, it was revealed that the consideration of cooling processes after the application of impulse current is significantly important as elucidating the lightning strike damage mechanism. Numerical analysis results corresponded with experimentally obtained results, but with a smaller delamination area, which implied that reduced interlaminar strength (fracture toughness) attributable to the progress of thermal decomposition accompanying heat generation dominated delamination from lightning strike damage. In addition, other phenomena including mechanical loading also affect lightning strike damage.
机译：这项研究检查了CFRP层压板遭受雷击的破坏机理。模拟的雷电流测试阐明了CFRP层压板的损坏行为。热重分析结果显示了热解行为。使用包含CFRP热分解模型的有限元方法（FEM）进行了热电分析，热传递分析和使用内聚元素的应力分析。使用内聚元素模型模拟分层。结果表明，考虑到雷击破坏机理，考虑施加脉冲电流后的冷却过程非常重要。数值分析结果与实验获得的结果相对应，但是分层面积较小，这意味着归因于伴随热产生的热分解的进展而导致的层间强度（断裂韧性）降低主导了雷击破坏引起的分层。此外，包括机械负载在内的其他现象也会影响雷击损坏。

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