64 トドマツあて材の剪断及び硬度試験

概要

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Comparisons of normal wood and compression wood of Todo-fir (green→F. S. P.) when tested in shearing and hardness may be summarized as follows;1. In normal wood, it has a close relation between specific gravity rings per unit length, but in compression wood, it has not.2. In both normal and compression wood, specific gravity is in direct proportion to summer wood (see Fig. 3).3. In shear parallel to grain test, comparisons of normal wood and compression wood are as follows (average values);τ_n<τ_c; τ_n/r_n>τ_c/r_c; η_n>η_c; τ_<nR><τ_<nT>; τ_<cR>>τ_<bT> where, τ : max. shear stress; η=(δ_p)/(τ_p)(cm/kg/cm^2); δ_p : shear deformation at proportional limit sress τ_p; r : specific gravity; c : compression wood; n : normal wood; R : radial; T : tangential.4. In Brinell hardness test, comparisons of normal wood and compression wood are as follows;He : Hs≒100 : 40 (in both normal wood and compression wood)Hc≒aS+b; Hn≒K; Hce (S=100%)≒pSe^q; Hce (S=100)≒p'l_f^<-q>' where; H : hardness value; e : end surface; s : side surface; S : summer wood at indented part; Se : summer wood of annual ring; l_f : spring wood-with; a, b, k, p, p', q & q' : constant.
一般社団法人日本森林学会の論文
1951-11-25