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首页> 外文期刊>Applied Mathematical Modelling >Modeling of thermal response and ablation in laminated glass fiber reinforced polymer matrix composites due to lightning strike
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Modeling of thermal response and ablation in laminated glass fiber reinforced polymer matrix composites due to lightning strike

机译：雷击引起的玻璃纤维增​​强复合材料层压复合材料热响应和烧蚀的建模

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摘要

Thermal response and ablation of laminated glass fiber reinforced polymer matrix composites subjected to lightning strike are studied. The associated nonlinear time-dependent heat transfer model includes specific features of lightning arcs observed in physical measurements such as lightning channel radius expansion, non-uniform lightning current density, and associated heat flux. Moving spatially and temporally non-uniform lightning-current-induced heat flux boundary and moving boundary due to material phase transition caused by rapid surface ablation are also included. To predict moving phase boundary in the laminated anisotropic composites, an element deletion method is developed and embedded into finite element analysis (FEA), which is performed using ABAQUS. The Umeshmotion + ALE method based on the user subroutine Umeshmotion and arbitrary Lagrangian-Eulerian (ALE) adaptive mesh technique is also used, when applicable (i.e., moving phase boundary is confined within a top layer of the composite laminate). Heat transfer analysis is performed for a non-conductive laminated glass fiber reinforced polymer matrix composite panel representing the SNL 100-00 wind turbine tip. Thermal response of the panel subjected to pulsed and continuing lightning currents at three different lightning protection levels, LPL Ⅰ, LPL Ⅱ, and LPL Ⅲ, is studied. Temperature-dependent anisotropic thermal properties of the composite panel are included in the analysis. The FEA results include temperature distributions and ablation zone profiles. The results show the Umeshmotion + ALE method is sufficient for the pulsed lightning current at all three LPL levels since the moving phase boundary, i.e. the ablation front, is found to be confined within the top layer of the laminate. For the continuing lightning currents at all three LPL levels, the Umeshmotion + ALE method is not applicable since the moving phase boundary comes to rest at depths exceeding the thickness of the top layer of the composite laminate.
机译：研究了夹层玻璃纤维增​​强聚合物基复合材料遭受雷击的热响应和烧蚀。关联的非线性时变传热模型包括在物理测量中观察到的雷弧的特定特征，例如雷电通道半径扩展，雷电电流密度不均匀以及关联的热通量。还包括在空间和时间上不均匀移动的雷电流感应的热通量边界和由于快速表面烧蚀导致的材料相变而移动的边界。为了预测层状各向异性复合材料中的移动相边界，开发了一种元素删除方法并将其嵌入到使用ABAQUS进行的有限元分析（FEA）中。如果适用的话，也可以使用基于用户子例程Umeshmotion和任意Lagrangian-Eulerian（ALE）自适应网格技术的Umeshmotion + ALE方法（即，将移动相边界限制在复合层压板的顶层内）。对代表SNL 100-00风力涡轮机叶尖的非导电层压玻璃纤维增​​强聚合物基复合板进行传热分析。研究了在三种不同的雷电防护等级LPLⅠ，LPLⅡ和LPLⅢ下，脉冲和持续雷电作用下面板的热响应。分析中包括了复合板的随温度变化的各向异性热特性。 FEA结果包括温度分布和烧蚀区轮廓。结果表明，Umeshmotion + ALE方法足以满足所有三个LPL级别的脉冲雷电流，因为已发现移动相边界（即烧蚀前沿）被限制在层压板的顶层内。对于所有三个LPL级别的持续雷电流，由于运动相位边界停留在超过复合层压板顶层厚度的深度，因此Umeshmotion + ALE方法不适用。

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