モウソウチクの複合構造と機械的特性 : 円筒壁の接線方向弾性率

概要

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Bamboo is a natural unidirectional fiber-reinforced material and so it is mechanically anisotropic. In this study, the relationship between the Young's modulus in the tangential direction of cylindrical wall within internode and the volume fraction of bundle sheathes V_f, or the specific gravity ρ was investigated on two samples of Mousou bamboo. The experimental results obtained are as follows : (1) The Young's modulus in the tangential direction E_T increased parabolically from the inner bark toward the outer bark in the cylindrical wall for both of the samples, and had a tendency of relative increase with height. (2) E_T could be approximated by the next equation. [numerical formula] where, E_f and E_m are Young's moduli of bundle sheathes and parenchyma, respectively. C is the ratio (0≦C≦1) of a parallel model. (3) The variation of specific gravity ρ among samples became large with increasing Vf when compared at the same V_f level. This is because the cell diameter of parenchyma differs with samples and the specific gravity increased with decreasing cell diameter of parenchyma. (4) An approximate equation was established between E_T and V_f. Consequently, E_T could be evaluated by the measurement of ρ by means of the linear relationship between V_f and ρ.
社団法人日本材料学会の論文
1991-01-15