多孔体としての木材の緩和弾性率

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The effect of the anatomical structure on the relaxation modulus of wood as a porous anisotropic material was discussed experimentally and theoretically through the numerical value of form exponent n (Eq. 1). Stress relaxation tests were carried out on a simplified model of the cell-lumen arrangement in the cross section of wood (Fig. 1) and the numerical values of n at 10, 10^2, 10^3 sec. were determined. On the basis of these experimental data, radial and tangential relaxation moduli were calculated by considering wood as a complex laminate with two stages of lamination, i.e. a laminate of alternating layers of transversely anisotropic earlywood and latewood perpendicular to ray tissue (Fig. 3). In this paper, a "strength of materials' approach" was used in order to compute the relaxation modulus of the above complex laminate. Modulus of ray tissue was also calculated theoretically. The results obtained are shown in Figs. 2 and 4. It was found that ; (1) The viscoelastic anisotropy of wood was strongly dependent upon the cell-lumen arrangement. However. in the viscoelastic analysis of whole wood, a unique complex lamination for wood must be taken into consideration in addition to cell geometry. (2) As the numerical value of n was independent of time and the simplest mixture rule was applicable to estimate the modulus of wood, it might be considered that the relaxation process of wood was due to that of wood substance.
社団法人日本材料学会の論文
1975-09-15

多孔体としての木材の緩和弾性率

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