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

1995 Fiscal Year Final Research Report Summary

Evaluation of bonding strength of dissimilar material joints by fracture mechanics

Research Project

Project/Area Number 06650808
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Material processing/treatments
Research InstitutionHimeji Institute of Technology

Principal Investigator

SEO Kenji  Himeji Institute of Technology Dep.of Mech.Eng., Professor, 工学部, 教授 (70047603)

Co-Investigator(Kenkyū-buntansha) NOGATA Fumio  Himeji Institute of Technology Dep.of Mech.eng., Associate professor, 工学部, 助教授 (70047629)
Project Period (FY) 1994 – 1995
KeywordsFracture Mechanics / Dissimilar Material Joints / Interface Mechanisc / J-integral / Interface Strength / Brazing / Adhesion / Finite Element Method
Research Abstract

In this study, J-integral of interfacial crack in the bonded joint which is composed of the materials with different mechanical properties, is studied. J-values of two type of bonded joints under the uniformly tensile stress and the three-point bending load are calculated by finite element method. One type is the bi-materials joint, in which the material B is bonded directly to the material A,and the other type is the tri-materials joint, in which the material B is bonded to the material A by using the insert material C.The effect of several factors (Young's modulus ratio of material A and B,difference in coefficient of linear expansion of material A and B,crack length etc.) on J-value is discussed. Furthermore, fracture tests are carried out using specimens that are bonded using an insert materials.
The results obtained are as follows.
1. It is clarified that the normalized J-values of bi-materials joint, J/J_<A=B> are able to be determined by the ratio of Young's modulus of both materials, E_A/E_B and difference in coefficient of linear expansion, (alpha_A-alpha_B). J_<A=B> is the J-value of same material joint. This is affected only by crack length.
2. J-values of tri-materials joint are affected by the thickness of insert materials, d, and the ratio of E_A/E_B and E_C/E_B. J-values can be calculated by the followed equation.
3. Critical J-value is analyzed from breaking load of fracture test by using J-values which is calculated by above equation. It is found that the critical J-value is reasonable parameter for evaluating bonding strength of dissimilar material joints.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 瀬尾健二ほか: "き裂を含む異種材接合部の強度評価" 溶接学会論文集. 12. 445-450 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 足立和浩ほか: "熱応力に起因する異種材接合部のJ積分値" 日本機械学会第72期全国大会講演概要集. 944-1. 274-276 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 足立和浩ほか: "中間層を有する異種材接合部のJ積分値の熱負荷特性" 日本機械学会関西支部第69期定時総会講演会講演論文集. 940-30. 145-147 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 日下正広ほか: "熱負荷を受ける異種材接合部のJ積分値に及ぼす中間層の影響" 溶接学会全国大会講演概要第57集. 第57集. 202-203 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 日下正広ほか: "熱負荷を受ける異種接合材の中間層材料選定に対する検討" 溶接学会溶接構造シンポジュウム'95講演論文集. 333-340 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 日下正広ほか: "異種材接合部の破壊力学的強度評価" 日本材料学会第8回破壊力学シンポジュウム講演論文集. 1-5 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Seo, M.Kusaka, F.Nogata, T.Ohta and T.Terasaki: "Evaluation of Bonding Strength of Dissimilar Material Joints with an Interface Crack" Quarterly Journal of The Japan Welding Society. Vol.12 No.3. 445-450 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Adachi, K.Seo, F.Nogata, M.Kusaka and T.Terasaki: "Effect of Thermal Load on the J-value of Dissimilar Material Joints with an Insert Layr" Preprint of the Japan Society of Mechanical Engineers. No.944-1. 274-276 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Adachi, K.Seo, F.Nogata, M.Kusaka and T.Terasaki: "J-value in the Dissimilar Material Joints Subjected to Thermal Stress" Preprint of the Japan Society of Mechanical Engineers. NO.940-30. 145-147 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Kusaka, K.Seo, F.Nogata, K.Adachi and T.Terasaki: "Investigation for Selection of Insert Layr Material of Dissimilar Material Joints Subjected to Thermal Load" Proceeding of The'95 Symposium on Welding Mechanics. 333-340 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Kusaka, K.Seo, F.Nogata, K.Adachi and T.Terasaki: "Effect of Insert Layr on the J-value of Dissimilar Material Joints Subjected to Thermal Load" Preprint of the National Meeting of J.S.W.Vol.57. 202-203 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Kusaka, K.Seo, F.Nogata, and T.Terasaki: "Evaluation of Bonding Strength of Dissimilar Material Joints by Fracture Mechanics" Proceeding of The 8th Symposium on Fracture and Fracture Mechanics. 1-5 (1995)

    • Description
      「研究成果報告書概要(欧文)」より

URL: 

Published: 1997-03-04  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi