Compressive Plastic Working of Woody Materials
Grant-in-Aid for Scientific Research (B)
|Research Institution||TOKYO METROPOLITAN UNIVERSITY|
NISHIMURA Hisashi TOKYO METROPOLITAN UNIVERSITY,Faculty of Engineering, Professor, 工学部, 教授 (70087170)
HASEGAWA Osamu TOKYO METROPOLITAN UNIVERSITY,Faculty of Engineering, Research Associate, 工学部, 助手 (80244416)
YAN Ming TOKYO METROPOLITAN UNIVERSITY,Faculty of Engineering, Research Associate, 工学部, 助手 (90240142)
MANABE Keniti TOKYO METROPOLITAN UNIVERSITY,Faculty of Engineering, Associate Professor, 工学部, 助教授 (10145667)
|Project Fiscal Year
1995 – 1997
Completed(Fiscal Year 1997)
|Budget Amount *help
¥7,700,000 (Direct Cost : ¥7,700,000)
Fiscal Year 1997 : ¥600,000 (Direct Cost : ¥600,000)
Fiscal Year 1996 : ¥700,000 (Direct Cost : ¥700,000)
Fiscal Year 1995 : ¥6,400,000 (Direct Cost : ¥6,400,000)
|Keywords||Woody Material / Compressud Wood / Lumber / Strength of Wood / Wood Working / Plastic Working / Compressive Working / 木材 / 木質材料 / 圧密木材 / 圧縮加工 / 木材加工 / 塑性加工 / 木材の強度|
1.Development of a compressive plastic working device for wood materials.
The working device consists of 1), plasticization device, 2), press device, 3), form fixation device. These devices where bought in 1995 and are working without major problems at the present time. The research done with the device were on compressing square timbers of Japanese cedar to one third of its original volume after heating the material in boiled water. To fix the form we used a method of sealing the both ends of the material before heating it to 180Cﾟ.
2.Strength evaluation of compressed wood materials.
We evaluate the strength of the compressed cedar, deformed with the mentioned device, trough tensile and bend test. The bending strength came out to be proportionately with the compression rate, which the one-third compressed wood showed 2.5 times stronger than the uncompressed one. The reason that the strength of the compressed material did not show 3 times was because the fibers of the material were destro
yed at the compressive working. Figuring out that the compressed wood's specific strength is 2 times larger than that of the Aluminum and 4 times larger than that of the steel, we can consider that compressed woods are worthy of use as lightweight construction material.
3.Form restoration expeiment.
We made experiment of the form restoration of the compressed wood material, which the form fixed material restored its form by being reheated with substances like boiled water. The experiment was done 10 times by putting the compressed material into boiled water at 100 Cﾟ for 10 minutes and taking out from it. The results showed that for higher compressing rate, lower restoration rate could be got.
4.Optimization of the heating/cooling curve at form fixing process.
For form fixing of a compressed wood, it has to be heated at 180Cﾟ, at a pressure of 10-atms for 10 minutes and then cooled. We could know that the cooling curve affects the form fixing performance.
5.Size effect at compressed wood production.
We compared the size effect between small test fragments used at laboratory experiment level and large test fragments with length up to 2 meters. The results showed no basic differences between the results of the experiment done with the small experiment fragment and actual productive size. Less
Research Output (13results)