Abstract
For oven-dried wood applied non-linear deflection, the temperature rising AT was constant after the initially slight temperature rising, and then arose immediately before fatigue failure. Moreover, there was not the rapid reduction of dynamic stress as observed for moist wood. On the other hand, the process to fatigue failure for various moist wood depended upon the moisture content. For heating vs. moisture content, the heating increased with moisture content up to 13 to 20%, while it decreased gradually above 20%. The processes to fatigue failure at more than 13% moisture content were similar to one another. These results were explained on energy balance between the heating due to flexibility of moist molecules in wood substances and the energy consumption for moisture movement and vaporization. The present results supported the mechanism of fatigue behavior in the non-linear region which was proposed in the previous report.
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