目的 为探究了面板厚度、蜂窝胞元尺寸、蜂窝壁层数和蜂窝芯高度对蜂窝夹层结构抗冲击性能的影响程度,并确定结构抗冲击最优的参数组合。方法 本文基于ABAQUS仿真软件,建立了蜂窝夹层结构在15 J低速冲击下有限元仿真力学模型,并通过落锤实验验证模型准确性;然后采用正交实验设计方法,构建不同结构参数组合的纤维金属层板（Fiber metal laminates,FMLs）/碳纤维增强复合材料（Carbon fiber reinforced plastic,CFRP）蜂窝夹层结构,并根据极差分析结果深入探究FMLs面板厚度、蜂窝胞元尺寸、蜂窝壁层数和蜂窝芯高度4个结构参数对其抗冲击性能的影响程度,最后对比分析得出具有最佳抗冲击性能的结构参数组合。结果 极差分析结果表明,面板厚度对蜂窝夹层结构抗低速冲击性能影响程度最大,其次为蜂窝胞元尺寸,而蜂窝芯高度和蜂窝壁的影响较小。进一步研究发现,随着面板厚度的增加和蜂窝芯胞元尺寸的减小,冲头的最大位移变小,而峰值载荷和能量吸收则变大。结论 建立以冲头最大位移、冲击峰值载荷和能量吸收为主的性能评估体系发现,在15 J低速冲击能量下,面板为4/3-FMLs、蜂窝胞元尺寸为5 mm、蜂窝壁层数为3层、蜂窝高度为15 mm组成的蜂窝夹层结构具有最佳抗冲击性能。
Abstract
The work aims to study the effect of panel thickness, honeycomb cell size, number of honeycomb wall layers and honeycomb core height on the impact resistance of honeycomb sandwich structures and to determine the parameter combination that yields the optimal impact resistance. A finite element simulation mechanical model of honeycomb sandwich structures under 15 J low velocity impact was established by ABAQUS, and the accuracy of the model was verified by the drop weight test. Then, the fiber-metal laminate (FMLs)/CFRP honeycomb sandwich structures with different structural parameters were designed through orthogonal experiments. According to the range analysis, the effect of the thickness of the FMLs panel, the honeycomb cell size, the number of honeycomb wall layers and the honeycomb core height on the impact resistance of the honeycomb sandwich structures was deeply explored. Finally, the experimental results were compared to obtain the honeycomb sandwich structure with the best impact resistance. The range analysis results showed that the panel thickness was the most significant factor affecting the low velocity impact resistance of the structure, followed by the size of the honeycomb cell, and the height of the honeycomb core and the number of honeycomb wall layers had minor effect. Further findings revealed that with the increase of the panel thickness and the decrease of honeycomb cell size, the maximum displacement of the punch decreased. Conversely, both the peak load and energy absorption increased. A performance evaluation system based on the maximum displacement of punch, peak load and energy absorption is established, and it is found that the honeycomb sandwich structure, composed of 4/3-FMLs, with a honeycomb cell size of 5 mm, three layers of honeycomb walls, and a honeycomb height of 15 mm, exhibits the best impact resistance under 15 J low velocity impact energy.
关键词
蜂窝夹层结构 /
有限元仿真 /
抗冲击性能 /
正交实验
Key words
honeycomb sandwich structure /
finite element simulation /
impact performance /
orthogonal experiment
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