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Fundamental Study on Mehcanism of Deformation for Bonded Wood Materials

Research Project

Project/Area Number 08456084
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 林産学
Research InstitutionThe University of Tokyo

Principal Investigator

MIZUMACHI Hiroshi  The University of Tokyo, Grad.Sch.of Agri.Life Sci., Professor, 大学院・農学生命科学研究科, 教授 (40022165)

Co-Investigator(Kenkyū-buntansha) KAJIYAMA Mikio  The University of Tokyo, Grad.Sch.of Agri.Life Sci., Assistant Professor, 大学院・農学生命科学研究科, 助手 (40191978)
TAKEMURA Akio  The University of Tokyo, Grad.Sch.of Agri.Life Sci., Assistant Professor, 大学院・農学生命科学研究科, 助手 (50183455)
ONO Hirokuni  The University of Tokyo, Grad.Sch.of Agri.Life Sci., Associate Professor, 大学院・農学生命科学研究科, 助教授 (30261960)
Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥7,900,000 (Direct Cost: ¥7,900,000)
Fiscal Year 1997: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1996: ¥7,400,000 (Direct Cost: ¥7,400,000)
Keywordsstrain energy release rate / adhesive strength / urethane adhesive / epoxy adhesive / polyvinglacerate / modeI / modeII / modeIII / ひずみエネルギー解放率 / 引張り接着強さ / 木材接着 / エポキシ樹脂 / ガラス状態 / ゴム状態 / 破壊靭性 / 応力集中
Research Abstract

The three strain energy release rates, G_<IC>, G_<IIC>, and G_<IIIC>, of the adhesive joints corresponding to different deformation modes, namely, mode I,mode II and mode III,respectively, are their ability to resist crack propagation of solids in the adhesive layr. In this study, dependence of G_<IC>, G_<IIC> and G_<IIIC> on crack length were examined using the double-cantilever beam specimens by a compliance method, and the experimental conditions accorging to which G_<IC>, G_<IIC> and G_<IIIC> can be evaluated inrespective of the dimension of the specimen. The adhesive tensile strength and adhesive shear strength of the joints, where the same adhesives are used, were also measured. It was found that there is a positive correlation between the adhesive strength and square root of the strain eneygy release rete of the corresponding mode of deformation. However, thecorrelation coefficient was not necessarily high because a variety of commercially available adhesives were used in the first experiment. Then, in the next step of this study, some of the typical and well-defined adhesives were chosen, and again the strain energy release rates of the three different modes for the bonded wood specimens were evaluated, and at the same time the adhesive tensile strength and adhesive shear strength were measured. It was found that the rate-temperature superposition procedure can be applied to the strain energy release rates of the adhesive joints if they are measured as a function of both temperature and rates of deformation. Inaddition, there is a positive correlation between the adhesive shear strength and square root of the strain energy release rate of mode II in most cases, but the correlation between the adhesive tensile strength and square root of the strain energy release rate of mode I is expressed by a loop if the adhesive poiymer changes from the glassy state to the rubbery state within the temperature range of the experiments.

Report

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

    (10 results)

All Other

All Publications (10 results)

  • [Publications] W.W.Lim, Y.Matano, H.Mizumachi: "Fracture Toughness of Adhesive Joints,I,Relation between Gc of diffarent Modes and Adhesive Strength" J.Appl.Polymer Sci.52. 967-973 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] W.W.Lim, H.Mizumachi: "Fracture Toughness of Adhegive Joints,II,Temperature and Rate Dependence of Gic and Adhesive Strength" J.Appl.Polymer Sci.57. 55-61 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] W.W.Lim, H.Mizumachi: "Influence of Rheslogical Properties ofAdhagive Polymers on GIC and Adhesive Teusilo Strength" Korean J.Pheology. 8・2. 129-130 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] W.W.Lim, H.Mizumachi: "Influence of Rheological Properties of Adhesive Polymer on Strain Energy Release Rate of Mode I and Adhesive Tensile Strength." Korean J.Rheology. 8(2). 129-138 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] W.W.Lim, H.Mizumachi: "Fracture Toughness of Adhesive Joints. III.Temperature and Rate, Dependencies of Mode II Fracture Toghness and Adhesive Shear Strength." J.Appl.Polymer Sci.63. 835-841 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] W.W.Lim, H.Mizumachi: "Influence of Rheological Properties of Adhesive Polymer on Strain Energy Release Rate of Mode II and Adhesive Shear Strength." J.Appl.Polymer Sci. 66. 525-536 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] W.W.Lim, Y.Hatano, H.Mizumachi: "Fracture Toughness of Adhesive Joints. I. Relation between Gc of different modes and Adhesive Strength" J.Appl.Polymer Sci.52. 967-973 (1994)

    • Related Report
      1997 Annual Research Report
  • [Publications] W.W.Lim, H.Mizumachi: "Fracture Toughness of Adhesive Joints II Temperature and Rate dependance of GIc and Adhesive Tensile Strength" J.Appl.Polymer Sci.57. 55-61 (1995)

    • Related Report
      1997 Annual Research Report
  • [Publications] W.W.Lim, H.Mizumachi: "Influence of Rhealogical Properties of Adhesive polymers on GIc and Adhesive Tensile Strength" Korean J.Rhealogy. 8・2. 129-138 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] W,W,Lim,H,Mizumachi: "Influence of Rheological Properties of Adhesive Polymer on Strain Energy Release Rate of Mode I and Adhesive Tensile Strength" Korcan Journal of Rheology. 8(2). 129-138 (1996)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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