年輪走向度の横引張りに及ぼす影響について

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Details of specimen for tension test perpendicular to grain determined by A. S. T. M. and Japanese・Engineering Standard are not suitable to measure the elongation of the specimen. By the difference of the angle which annual ring makes with the loading direction, the elongation will be altered presumably. In conformity with the above presumption, the specimen shown in Fig. 4 was prepared and the test was carried out by using the clear specimen of TSUGA (Tsuga Sieboldie) and HINOKI (Chamaecyparis obtusa) in green condition. Their moisture contents, ring-widths and specific gravities are to be shown in Table 2.The tensile load was applied by the Amsler testing machine (500 kg Capacity) and the elongation of specimen was measured by the mirror extenso-meter. These results are shown in Table 3.As a result of the statistical treatment, the tensile strength of the tangential load application is always larger than the stress of the bastard load application.The type of this specimen can be only worked out from a big bole, and must be worked out with extreme care. At the second FAO Conference (1951,Austria) Mr. H. KuHNE had manifested a new shape as Type A. in Fig. 3.When the tensile load is applied to the bastard load (45°), its elongation is about 4 times of that in case of the tangential load application, and about 8 times of the radial load application. These phenomena will be caused by the various anatomical wood structures, and then Fig. 8 is one of the simple model explanations. The other cases will be studied by the coming experiments.
一般社団法人日本森林学会の論文
1953-11-25

著者

今泉勝吉
建設省建築研究所

年輪走向度の横引張りに及ぼす影響について

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