抄録
In this study, six species of wood and four wood based materials were tested in bending from -180 to +20°C, and the influence of temperature on bending strength (Fb) and Young's modules (Eb) was discussed. In the case of wood, not only the effect of temperature but also that of specific gravity on Fb and Eb were discussed. The moisture content of specimens was controlled to about 4% at 20°C in a vacuum, and the temperature during bending tests was regulated with liquid nitrogen and nitrogen gas.
The results obtained are as follows.
(1) In the case of wood, Eb and Fb are representable by the equations (3) and (4) respectively, containing two factors, specific gravity (ρ) and test temperature (θ°C).
(2) The effect of temperature on Eb for wood based materials tested is illustrated on Figures 1 to 6. As the results, Eb increases as temperature falls, and their relation can be expressed approximately by a regression straight line for each wood based material.
(3) Figure 7 shows the relation between Fb for wood based materials and test temperature.
