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Finite Element Analysis on the Impact-induced Damage of Composite Fan Blades Subjected to a Bird Strike*

机译:鸟击对复合风扇叶片冲击损伤的有限元分析*

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摘要

Carbon fiber-reinforced composites have been recently applied for engine fan blades because of their high specific strength. In the design of the fan blade, bird-strike impact is one of the greatest concerns, since impact-induced damage can lead to the engine stalling. This study presents a numerical method to analyze bird-strike impact as a soft-body impact on a cantilevered composite panel. Especially, we coupled a stabilized dynamic contact analysis, which enables appropriate prediction of impact force on the panel, with laminate damage analysis to predict the impact-induced progressive damage in the composite. This method is verified through a comparison with experimental results. With the numerical method, we investigate the effect of impact condition, blade thickness and shape on the impact-induced damage in a composite fan blade subjected to a bird strike. An intermediate blade thickness and a large blade curvature help to improve the bird-striking impact resistance of the composite.
机译:碳纤维增强复合材料由于其高比强度而最近已被用于发动机风扇叶片。在风扇叶片的设计中,鸟撞击是最大的担忧之一,因为撞击引起的损坏可能导致发动机熄火。这项研究提出了一种数值方法来分析鸟击撞击作为悬臂复合面板上的软体撞击。尤其是,我们将稳定的动态接触分析与层压板损伤分析相结合,从而可以对面板上的冲击力进行适当的预测,而层压板损伤分析则可以预测复合材料中由冲击引起的渐进式损伤。通过与实验结果的比较验证了该方法。通过数值方法,我们研究了冲击条件,叶片厚度和形状对遭受鸟击的复合风扇叶片的冲击诱导损伤的影响。中等的叶片厚度和较大的叶片曲率有助于提高复合材料的耐鸟击冲击性。

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