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Compressive Plastic Working of Woody Materials

Research Project

Project/Area Number 07455293
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Material processing/treatments
Research InstitutionTOKYO METROPOLITAN UNIVERSITY

Principal Investigator

NISHIMURA Hisashi  TOKYO METROPOLITAN UNIVERSITY,Faculty of Engineering, Professor, 工学部, 教授 (70087170)

Co-Investigator(Kenkyū-buntansha) 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 Period (FY) 1995 – 1997
Project Status 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)
KeywordsWoody Material / Compressud Wood / Lumber / Strength of Wood / Wood Working / Plastic Working / Compressive Working
Research Abstract

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 … More 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

Report

(4 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • 1995 Annual Research Report
  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] 西村 尚: "木材の塑性加工" 素形材. 37-10. 1-7 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 西村 尚: "圧縮塑性加工した木材の破壊現象" 日本機械学会関西支部講演会論文集No.964-1. 366-367 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 西村 尚: "圧縮塑性加工した木材の強度" 日本機械学会材料力学部門講演会No.95-2. 111-112 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] NISHIMURA,HISASHI: "Plastic Working of Lumber" SOKEIZAI. Vol.37.No.10. 1-7 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] NISHIMURA,HISASHI: "Strength of Wood Deformed under Compressive Forming" Proc.1995 Ann.Met.JSME. No.95-2. 111-112 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] NISHIMURA,HISASHI: "Fracture Behavior of Compressed Wood" Proc.1996 Ann.Met.JSME KANSAI. No.964-1. 366-367 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 西村 尚: "木材の塑性加工" 素形材. 37-10. 1-7 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] 西村 尚: "圧縮塑性加工した木材の破壊現象" 日本機械学会関西支部講演会論文集No964-1. 366-367 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] 西村 尚: "圧縮塑性加工した木材の強度" 日本機械学会材料力学部門講演会No.95-2. 111-112 (1995)

    • Related Report
      1997 Annual Research Report
  • [Publications] 西村尚: "木材の塑性加工" 素形材. 37-10. 1-7 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 西村尚: "圧縮塑性加工した木材の破壊現象" 日本機械学会関西支部講演会論文集No964-1. 366-367 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 西村,尚: "圧縮塑性加工した木材の破壊現象" 日本機械学会関西支部講演会論文集 No964-1. (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] 西村,尚: "圧縮塑性加工した木材の強度" 日本機械学会材料力学部門講演会論文集 No95-2. 111-112 (1995)

    • Related Report
      1995 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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