OS1008 オニバスの葉に見る特異な葉脈構造と浮力(生体と材料力学,オーガナイズドセッション)

概要

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A leaf of Prickly water lily (Euiyale ferox) is one of the typical large-size floating structure. In order to investigate the generation mechanism of buoyancy observed in the leaf of Prickly water lily, a simple buoyancy experiment and optical measurements about the leaf were performed. The geometry of vein and laniina, i.e. venation pattern, length and width of veins, vein cross-sectional area, thickness of lamina and so on, was measured. To know how strong the vein and lamina are, quasi-static tensile tests for several leaf parts were also carried out. It was found that Young's modulus of bottom surface of vein was about 4 or 5 times greater than that of other parts. By using the geometry and the mechanical properties of vein and lamina, a numerical model for FEM analysis was constructed. The buoyancy estimated from FEM analysis showed a reasonable value comparing with an experimental data.
一般社団法人日本機械学会の論文
2009-07-24