| Project/Area Number |
61560180
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
林産学
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| Research Institution | Utsunomiya University |
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Principal Investigator |
KITAHARA Ryushi Assosiate Professor Utsunomiya University , Faculty of Agriculture, 農学部, 助教授 (40089933)
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| Project Period (FY) |
1986 – 1987
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| Project Status |
Completed (Fiscal Year 1987)
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| Budget Amount *help |
¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1987: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1986: ¥1,000,000 (Direct Cost: ¥1,000,000)
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| Keywords | Wood / Tracheid / Cell Wall / Machanical Behaviour / Stress and Strain / Earlywood and Latewood / Cell-wall Deformation / 年輪構造 / 破壊 / 圧縮によるシワ |
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| Research Abstract |
This study deals with the mechanical respones of the cell-wall of tracheids to the compressive load applied parallel to the grain. The results from the analysis of sugi-wood (Cryptomeria japonica) were used to introduce: 1) the stress-strain behaviour in both the earlywood and the latewood in the wood specimen applied load and 2) the effect of the wood-structure/cellular-structure on the mechanical behaviour within the growth increments.
The differences in stress/strain behaviour between the earlywood and the latewood were remarkable at air-dried condition: the earlywood acted as plastic body even under the very low stress, and the latewood as elastic body even under higher stress level. While the water-saturated wood had much less difference in the mechanical behaviour between the earlywood and the latewood than the air-dried wood.
The mechanical properties and behaviour of timber are affected by the cell-wall characteristics of tracheids. The amount of cell-wall substance and the rate of growth in diameter had a strong effect on the mechanical behaviour within increments. The difference between the cell-wall of tracheids in the latewood and that in the earlywood in the stress induced increased considerably with increased stress level. It is apparent that the cell-wall of tracheids in the latewood performs the function of mechanical support against the load applied.
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