• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Studies on the nondestructive test of wood and its application to the grading system

Research Project

Project/Area Number 63302060
Research Category

Grant-in-Aid for Co-operative Research (A)

Allocation TypeSingle-year Grants
Research Field 林産学
Research InstitutionThe University of Tokyo

Principal Investigator

OKUMA Motoaki  Univ.of Tokyo, Fac.of Agr. Professor, 農学部, 教授 (80011906)

Co-Investigator(Kenkyū-buntansha) NAKAI Takashi  Forestry and Forest Rrod.Institute, Researcher, 研究員
IIJIMA Yasuo  Toyama Forestry Res.Center Researcher, 研究員
NAKAMURA Noboru  Univ.of Tokyo, Fac.of Agr. Assistant Professor, 農学部, 助手 (30180384)
SHIDA Satoshi  Univ.of Tokyo, Fac.of Agr. Assistant Professor, 農学部, 助手 (00201541)
ARIMA Takanori  Univ.of Tokyo, Fac.of Agr. Associate Professor, 農学部, 助教授 (10144057)
倉田 久敬  北海道立林産試験場, 試験部, 課長
Project Period (FY) 1988 – 1989
Project Status Completed (Fiscal Year 1989)
Budget Amount *help
¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 1989: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1988: ¥2,000,000 (Direct Cost: ¥2,000,000)
KeywordsProof loading / Dynamic test / Stress wave / Sound analysis / Acoustic emission / Image analysis / Log / Structural wood / 製造用木材 / 非破壊検査 / 強度等級区分 / 建築用木材 / 国産材 / 乾燥
Research Abstract

An effective nondestructive test is strongly necessary to develop the grading system of the structural members (sawn lumber or wood-based materials) in the wood construction. In this study, several kinds of nondestructive tests were applied to the wooden materials to investigate the possibilities and the conditions as the testing method for the strength grading system.
Results of the study are summarized as follows ; (1) Static bending by dead load, dynamic bending, stress wave and sound analysis tests were considered as nondestructive testing methods to get MOE of the specimen. Also, acoustic emission tests and image analysis method were taken up to inspect the defect of wood. The data from these tests will serve for the conservative visual inspection. (2) Every methods have their own limitations in the practical application to the structural grading of wood and the combination of these test methods seemed to be very effective. (3) Moisture content of the material has a great effect on the value of nondestructive test. So, a prediction method of moisture content was proposed. Moisture content can be calculated from the weight and the volume of wood by this system. (4) A plenty of data of MOE and MOR were provided from each forestry institutes, and the relationship between MOE and MOR was investigated. And then, this relation was analyzed in the way of reliability theory for its application to the strength grading system.

Report

(3 results)
  • 1989 Annual Research Report   Final Research Report Summary
  • 1988 Annual Research Report
  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] 祖父江信夫: "パソコンによる実大木材のヤング率の自動測定" 木材工業. 42. 415-417 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 佐道,岩崎: "ヒノキ、スギ材面に現われる節の画像解析" 木材学会誌. 35(12). 1073-1079 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 信田聡: "建築用製材の含水率測定システム" 木材工業. 43(8). 8-13 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 中井孝: "構造用製材の強度等級区分に関する研究" 昭和58年林業試験場研究報告. 196-218 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 有馬孝礼,丸山則義: "木材の打撃音分析によるヤング係数と水分変動の評価" 材料(投稿中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 名波直道,中村昇,大熊幹章: "立木、丸太材の弾性波の伝達経路" 日本木材学会大会要旨集(予定). (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] T.ARIMA, et al: "Evaluation for modulus of elasticity and weight change of lumber by sound analysis" Zairyo (in printing).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] N.SOFUE: "Automated measurement of Young's modulus of timber using a personal computer" Wood Industry. 42-9. 21-23 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] T.SADOH, et al: "Image analysis of knots appearing in Hinoshi and Sugi lumber" Mokuzai Gakkaishi, 35, 1073-1079(1989).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] S.SHIDA: "Development of the moisture grader for lumber" Wood Industry, 43-8, 8-13(1988).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 祖父江信夫: "パソコンによる実大木材のヤング率の自動測定" 木材工業. 42. 415-417 (1987)

    • Related Report
      1989 Annual Research Report
  • [Publications] 佐道・岩崎: "ヒノキ、スギ材面に現われる節の画像解析" 木材学会誌. 35(12). 1073-1079 (1988)

    • Related Report
      1989 Annual Research Report
  • [Publications] 信田聡: "建築用製材の含水率測定システム" 木材工業. 43(8). 8-13 (1988)

    • Related Report
      1989 Annual Research Report
  • [Publications] 中井孝: "構造用製材の強度等級区分に関する研究" 昭和58年林業試験場研究報告. 196-218 (1985)

    • Related Report
      1989 Annual Research Report
  • [Publications] 有馬孝礼・丸山則義他: "木材の打撃音分析によるヤング係数と水分変動の評価" 材料.

    • Related Report
      1989 Annual Research Report
  • [Publications] 名波直道・中村昇・大熊幹章: "立木・丸太材の弾性波の伝達経路" 日本木材学会大学要旨集. (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] 佐藤敬一: 第39回日本木材学会大会要旨集(1989).

    • Related Report
      1988 Annual Research Report
  • [Publications] 飯島泰男: 第39回日本木材学会大会要旨集(1989).

    • Related Report
      1988 Annual Research Report

URL: 

Published: 1988-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi