Abstract
The properties of compression parallel to grain were examined by using the wood compressed perpendicular to the grain with various ratios, and the plastic stress-strain behavior in the compression properties was investigated. The results was summarized that the compression strength parallel to the grain increased with the larger compression ratio in the heat treated condition without dimensional recover. The change of the plastic behavior in the compression stress-strain curves was recognized in the boundary before and after reached to the maximum stress. The plastic behavior after reached to the maximum stress in the stress-strain diagram showed that the effect of the work-softened appeared remarkably with the larger compression ratio. The plastic region before reached to the maximum stress decreased with the larger compression ratio. From this result, it was concluded that distinguish of wooden porous tissue by densification affected to the plastic behavior with yielding in the compression stress-strain diagram.
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