シャットル用材の機械的性質

This paper deals with the results on the mechanical properties (tension parallel to grain, compression parallel to grain, Brinell hardness, bending, shearing and impact bending) of 16 species used in Shuttle at this day is shown in Table 1.
The results obtained are as followes :
1. The testing results are given in Table 2 - 7 and the relation between specific gravity and each strength are shown in Fig. 1 - 9. It is supported that each strength increase with the increase of the magnitude of specific gravity.
In the shearing strength, relation between the direction of medullary ray and the direction of the applied force is given in Fig. 10.
This result is also shown that the shearing strength increase with the increase of the magnitude of the angle between the direction medullary ray and the direction of applied force.
Appendix I. ─ The mecanichal tests of compressed-wood "Shide-Wood" (Carpinus carpinoides MAKINO).─
The testing results are shown in Table 8.
Appendix II. ─ The effects of some mechanical properties of the "Impregnated-Wood" with the linseed oil. ─
The testing result is shown in Table 9. The relation between cleavage resistance and the magnitude of angle, which is the angle for direction of medullary ray and the direction of applied force, is shown in Fig. 10.
The cleavage resistance increase with the increase of the magnitude of angle between the direction of medullary ray and the direction of applied force.
There is no significant effect in respect of these mechanical properties of impregnated-wood with the linseed oil.