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Establshment of theory on fracture of wood and its application to RBD (Reliability Based Design)

Research Project

Project/Area Number 06302069
Research Category

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

Allocation TypeSingle-year Grants
Research Field 林産学
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

MASUDA Minoru  Kyoto Univ., Fac.of Agri.Professor, 農学部, 教授 (40027165)

Co-Investigator(Kenkyū-buntansha) SOBUE Nobuo  Shizuoka Univ., Fac.of Agri.Professor, 農学部, 教授 (50023495)
SATOH Kiyoshi  Mie Univ., Fac.of Educa.Professor, 教育学部, 教授 (80006444)
YOSIHARA Hirosi  Tokyo Univ., Fac.of Agri.Assis.Professor, 農学部, 助手 (30210751)
OHTA Masamitu  Tokyo Univ., Fac.of Agri.Professor, 農学部, 助教授 (20126006)
MIHASHI Hirozou  Touhoku Univ., Fac.of Engi.Professor, 工学部, 教授 (90091751)
佐藤 敬一  東京農工大学, 農学部, 助手 (90178723)
鈴木 直之  三重大学, 生物資源学部, 助教授 (40106977)
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥7,200,000 (Direct Cost: ¥7,200,000)
Fiscal Year 1995: ¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 1994: ¥3,900,000 (Direct Cost: ¥3,900,000)
Keywordsfracture mechanics / fracture criterion / reliability based design / finite area fracture theory / bolted joint / image correlation method / wood / laminated lumber / RBD / クライテリオン / 有限要素法 / アコースティック・エミッション / アコースティックエミッション
Research Abstract

(1) Bending strength of timber beams including end notches was calculated using finite area fracture theory. Theoretical results coincide well with experimental ones. The optimum sizes of the finite small area are 1.5mm for grain direction, 0.2mm for radial or tangential direction. Bolted joints were also investigated theoretically and experimentally, and good correlation was observed between them. Stress-strain relationship in shear was observed by image correlation method, and it makes clear that constitutive equation of shear is non-linear or nearly elasto-plastic (M.MASUDA) . Introduction of linear fracture mechanics especially stress intensity factor K was attemmpted for simple practical method in estimation of failure or ultimate load of bolted joints, but more investigation was needed for accurate estimation (N.SOBUE) .
(2) Monte Carlo method was used to estimate decrease of variation with lamination of Sugi (Japanese cedar) laminae. Considering the reinforcement effect of adhesion and elastoplastic behavior in compression, better estimation of strength variation was observed (H.MIHASHI)
(3) Propagation of crack in wood after crack initiation was investigated theoretically by means of EDEM (Extended Distinct Element Method) . More improvement was necessary to analyze the fracture process of wood (M.OHTA) . Plastic behavior in shear was observed by torsioning wood. It makes clear that Hill type equation fits better than Jenkin type equation in yielding behavior under mixed modes stresses (H.YOSHUHARA) . Fracture under mixed modes of I and II were investigated experimentally. None of fracture criteria fit the experimental results (K.SATO) . It was obseved experimentally that there is a little difference between Ks measured by three different methods i.e.compact tension, three point bending and tension with one side crack (N.SUZUKI) .

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (37 results)

All Other

All Publications (37 results)

  • [Publications] 増田 稔: "有限小領域平均応力に基づく破壊基準を用いた材端切欠き梁の破壊解析" 京都大学農学部演習林報告. 67. 158-166 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Masamitsu OHTA: "The Effect of Cutting Speed on the Surface Quality in Wood Cutting -Model Experiments and Simulations by the Extended Distinct Element Method" Proceedings of The 12th International Wood Machining Seminar (1995.10). (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Hiroshi YOSHIHARA: "Analysis of the Buckling Stress of an Intermediate Wooden Column by the Tangent Modulus Theory" Mokuzai Gakkaishi. 41(4). 367-372 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Hiroshi YOSHIHARA: "Shear Stress-Shear Strain Relationship of Wood in the Plastic Region" Mokuzai Gakkaishi. 41(6). 529-536 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Hiroshi YOSHIHARA: "Determination of the Shear Stress-Shear Strain Relationship of Wood by Torsion Tests" Mokuzai Gakkaishi. 41(11). 988-993 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 佐藤 清: "木材の破壊じん性および機械的性質に及ぼす熱処理の影響" 三重大学教育学部研究紀要 自然科学. 46. 109-112 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 佐藤 敬一: "スギ(Cryptomeria japonica)の破壊じん性とアコースティック・エミッション特性" 東京農工大学農学部演習林研究報告. 33. 19-26 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 増田 稔: "有限小領域ひずみ破壊クライテリアを用いた木材の破壊力学" 第8回破壊力学シンポジウム(1995.9.26,27)講演論文集. 54-58 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 板垣 直行: "スギ集成材の性能設計方法の開発に関する研究(1)-ラミナのヤング係数により設計された集成材の実大試験とシミュレーション-" 日本建築学会大会学術講演梗概集(1995.8). 79 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 佐藤 清: "コンプライアンス法による木材のヤング係数の測定" 三重大学教育学部研究紀要 自然科学. 46. 113-118 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 佐藤 清: "複合負荷条件下における木材の破壊" 日本機会学会材料力学部門講演会講演論文集(1995.8.24). Vol. A. 109-110 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 佐藤 清: "木材の破壊じん性" 日本機会学会第73回全国大会講演論文集(1995.9.13). Vol. I. 398-399 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 祖父江 信夫: "木材の非破壊検査" 非破壊検査. 44(11). (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Minoru MASUDA and Osamu TANOURA: "A Fracture Analysis of End Nothced Timber Beams using the Fracture Criterion Based on Average Stresses in the Finite Small Area" Bulletin of the Kyoto University Forests. No.67. 158-166 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Masamitsu OHTA and Bunta KAWASAKI: "The Effect of Cutting Speed on the Surface Quality in Wood Cutting-Model Experiments and Simulations by the Extended Distinct Element Method" Proceedings of the 12th International Wood Machining Seminar. (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Hiroshi YOSHIHARA and Masamitsu OHTA: "Analysis of the Buckling Stress of an Intermediate Wooden Column by the Tangent Modulus Theory" Mokuzai Gakkaishi. 41(4). 367-372 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Hiroshi YOSHIHARA and Masamitsu OHTA: "Shear Stress-Shear Strain Relationship of Wood in the plastic Region" Mokuzai Gakkaishi. 41(6). 529-536 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Hiroshi YOSHIHARA and Masamitsu OHTA: "Determination of the Shear Stress-Shear Strain Relationship of Wood by Torsion Tests" Mokuzai Gakkaishi. 41(11). 988-993 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Kiyoshi SATO,Hisato YAMAMOTO and Yasushi KITANI: "Influence of Heat-tratment on Fracture Toughness and Mechanical Properties of Wood" Memories of the College of Education, Mie University. No.46. 109-112 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Keiichi SATO,Takaharu HONDA,Kosei ANDO,Takafumi KUBO and Masami FUSHITANI: "Fracture Toughness and Acoustic Emission Characteristics of Sugi (Cryptomeria japonica)" Research Bulletin of the University Forests, Tokyo University of Agriculture and Technology. No.33. 19-26 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 増田稔: "有限小領域平均応力に基づく破壊基準を用いた材端切欠き梁の破壊解析" 京都大学農学部演習林報告. 67. 158-166 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 増田稔: "有限小領域ひずみ破壊クライテリアを用いた木材の破壊力学" 第8回破壊力学シンポジウム(1995.9.26,27)講演論文集. 54-58 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 板垣直行: "スギ集成材の性能設計方法の開発に関する研究(1)-ラミナのヤング係数により設計された集成材の実大試験とシミュレーション-" 日本建築学会東北支部研究発表会要旨集(1995.6). 375-378 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 板垣直行: "スギ集成材の性能設計方法の開発に関する研究(2)-ラミナのヤング係数と,曲げ,引張,圧縮破壊強度の関係-" 日本建築学会大会学術講演梗概集(1995.8). 79- (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Masamitsu OHTA: "The Effect of Cutting Speed on the Surface Quality in Wood Cutting -Model Experiments and Simulations by the Extended Distinct Element Method" Proceedings of The 12th International Wood Machining Seminar(1995.10). (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Hiroshi YOSHIHARA: "Analysis of the Buckling Stress of an Intermediate Wooden Column by the Tangent Modulus STheory" Mokuzai Gakkaishi. 41(4). 367-372 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Hiroshi YOSHIHARA: "Shear Stress-Shear Strain Relationship of Wood in the Plastic Region" Mokuzai Gakkaishi. 41(6). 529-536 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Hiroshi YOSHIHARA: "Determination of the Shear Stress-Shear Strain Relationship of Wood by Torsion Tests" Mokuzai Gakkaishi. 41(11). 988-993 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 佐藤清: "木材の破壊じん性および機械的性質に及ぼす熱処理の影響" 三重大学教育学部研究紀要 自然科学. 46. 109-112 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 佐藤清: "コンプライアンス法による木材のヤング係数の測定" 三重大学教育学部研究紀要 自然科学. 46. 113-118 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 佐藤清: "複合負荷条件下における木材の破壊" 日本機会学会材料力学部門講演会講演論文集(1995.8.24). Vol.A. 109-110 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 佐藤清: "木材の破壊じん性" 日本機会学会第73回全国大会講演論文集(1995.9.13). Vol.1. 398-399 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 祖父江信夫: "木材の非破壊検査" 非破壊検査. 44(11). (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 三橋博三: "スギ集成材の性能設計方法の開発に関する研究(1) ラミナのヤング係数により設計された集成材の実大実験とシミュレーション" 日本建築学会東北支部研究報告集. 58. (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] Yoshihara,H.and Ohta,M.: "Measurement of the in-plane elastic constants of wood by the uniaxial compression test using a single specimen" 木材学会誌. 41. 218-222 (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] Yoshihara,H.and Ohta,M.: "Analysis of the bucking stress of an intermediate wooden column by the tangent modulus theory" 木材学会誌. 41. (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] 佐藤清,山本尚登,木谷康司: "木材の破壊じん性および機械的性質に及ぼす熱処理の影響" 三重大学教育学部研究紀要(自然科学). 46. 119-122 (1995)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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