Specimen representation on the prediction of artificial test lightning plasma, resulting specimen loading and subsequent composite material damage
Specimen representation on the prediction of artificial test lightning plasma, resulting specimen loading and subsequent composite material damage
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DOI：
10.1016/j.compstruct.2019.111545
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发表时间：
2020-01
影响因子：
6.3
通讯作者：
S. Millen;A. Murphy;Gasser Abdelal;G. Catalanotti
中科院分区：
文献类型：
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作者：
S. Millen;A. Murphy;Gasser Abdelal;G. Catalanotti
前面的工作已经建立了人工试验雷电等离子体和复合材料试样损伤可以建模。然而，没有工作已经研究了试样代表性的等离子体建模的影响和由此产生的影响试样复合材料的损坏。在这里，四个不同的试样设计已建模，磁流体动力学FE多物理场模型用于模拟等离子体和FE热电建模方法用于预测复合材料的损坏。对于在此建模的测试安排，已经发现，试样代表性对等离子体全局结构的影响有限，即使试样特性发生显著变化（例如，从铜到环氧树脂）。然而，值得注意的变化，在当地的试样表面负载与试样性能的变化（如环氧树脂碳增强环氧树脂），与表面压力，速度，电流密度和温度变化高达88%的峰值幅度。局部试样表面载荷的这种变化确实显著改变了复合材料热损伤深度（高达1200%）和表面损伤面积（高达1314%）的预测。此外，这项工作，第一次，提供了受保护和未受保护的复合材料试样暴露于测试标准波形B的热损伤的预测。
Preceding work has established that artificial test lightning plasma and composite test specimen damage can be modelled. However, no work has studied the impact of specimen representation in the modelling of the plasma and the resulting impact on specimen composite damage. Herein four distinct specimen designs have been modelled, with a magnetohydrodynamic FE multiphysics model employed to simulate the plasma and a FE thermal-electric modelling approach used to predict composite material damage. For the test arrangements modelled herein it has been found that specimen representation has limited impact on plasma global structure, even with significant change in specimen properties (e.g. from copper to epoxy). However, noteworthy variation in the local specimen surface loading is witnessed with specimen property change (e.g. epoxy to carbon reinforced epoxy), with peak magnitudes for surface pressure, velocity, current density and temperature changing by up to 88%. Such variation in local specimen surface loading does significantly vary the prediction of composite material thermal damage depth (up to 1200%) and surface damage area (up to 1314%). Moreover, this work, for the first time, provides predictions for the thermal damage suffered by both protected and unprotected composite specimens exposed to test standard Waveform B.