Some Availabilities of Lumbers from Sugi (Cryptomeria japonica) Tree Damaged by Typhoon

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  • Fujimoto Noboru
    Department of Forest Products, Faculty of Agriculture, Kyushu University
  • Hisatomi Hiroto
    Department of Forest Products, Faculty of Agriculture, Kyushu University
  • Fujimoto Yoshiyasu
    Department of Forest Products, Faculty of Agriculture, Kyushu University
  • Kawabe Junichi
    Department of Forest Products, Faculty of Agriculture, Kyushu University
  • Mataki Yoshihiro
    Department of Forest Products, Faculty of Agriculture, Kyushu University

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Other Title
  • スギ台風被害木の材質および利用適正
  • スギ台風被害木の材質および利用適性
  • スギ タイフウ ヒガイ ボク ノ ザイシツ オヨビ リヨウ テキセイ

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Abstract

This paper is concerned with the availability of sugi wood damaged by the serious typhoon in Kyushu Island. The following results were obtained ; 1. In bending test, the MOR of the lumber with some partial compression failures (mome) was obviously smaller than that free from such a damage, however, the MOE of the former was almost the same as that of the latter. 2. In AE monitoring in bending test, AE signals of lumber free from the damage generated over the proportional limit of load-deformation diagram, but those of lumber with mome developed directly after the beginning of bending. 3. As was evident from the observation of the cross-sectional distributions of bending properties of lumber with mome, the localization of mome was similar not to both the distributions of the MOE in the static test and the tapping method but clearly to both the distributions of the MOR and the stress at proportional limit. 4. By the middle ordinate method under an uniform bending moment throughout the whole span of lumber, the significant correspondence could be observed between the localization of mome and the MOE along the length of lumber. Especially, it was certain that presence of mome more than 50% ratio to the whole cross section caused a low value evidently for the localized MOE. 5. There was significant difference not in wood failure, but surely in bonding strength between both the glue lines of lamina with mome and that free from mome.

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