仿鞘翅轻质曲面夹心板结构的设计及其力学性能研究
首发时间:2015-02-03
摘要:甲虫鞘翅是一种优异的天然复合材料, 具有壳薄、质轻、高强韧性、抗断裂性能、损伤自愈合、疏水等性能。本文采用三维激光扫描仪对东方龙虱鞘翅进行扫描, 获取点云数据, 抽取甲虫鞘翅轮廓线进行曲线拟合,运用逆向工程技术进行曲面重建。在对甲虫鞘翅外形曲面重构和断面微观结构特征分析的基础上,设计、制备了一种仿甲虫鞘翅轻质结构曲面夹心板。对仿生结构模型进行有限元分析, 并对试样进行实验测试,以验证有限元分析的正确性和可靠性。在此基础上,在相同结构尺寸下将仿生曲面夹心板与平板夹心结构进行力学性能比较,结果表明所设计的仿鞘翅轻质曲面夹心板具有更优越的力学性能。
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The curved lightweight sandwich structure design inspired by beetle's elytra and its mechanical property
Abstract:Beetles elytra is an excellent natural composite material, with thin shell, light weight, high strength and toughness, fracture resistance,damage self-healing, and hydrophobic properties. In this paper, a three-dimensional laser scanner is applied to obtain the point cloud data of beetle's elytra, and reverse engineering technology was used to reconstruct the elytra surface. Based on surface reconstruction and the microstructure of the cross-section of the beetle's elytra, a kind of bio-inspired curved lightweight sandwich structure was designed and built with a 3D printer. The mechanical properties of the bio- inspired structure was analyzed using the finite element method, and an experiment on the structure samples was carried out to verify the effectiveness of the finite element method. In addition, under the same dimension size and same core structure, the mechanical property of the curved structure was compared to that of plane structure with FEM. Results show that the bio-inspired curved lightweight sandwich structure has higher bearing capacity than the plane sandwich structure.
Keywords: bio-inspired design;Beetle's elytra;microstructure;surface reconstruction ;mechanical analysis
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