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1997 Fiscal Year Final Research Report Summary

Fracture Mechanics Based Simulation for Microstructural Control in Metal Matrix Composites

Research Project

Project/Area Number 07455281
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Structural/Functional materials
Research InstitutionTOYOHASHI UNIVERSITY OF TECHNOLOGY

Principal Investigator

KOBAYASHI Toshiro  Toyohashi University of Technology, Department of Engineering, Professor, 工学部, 教授 (90023324)

Co-Investigator(Kenkyū-buntansha) TODA Hiroyuki  Toyohashi University of Technology, Department of Engineering, Lecture, 工学部, 講師 (70293751)
Project Period (FY) 1995 – 1997
KeywordsMMC / FEM / PFZ / simulation / crack propagation / microcracks / crack-tip singularity
Research Abstract

Effects of locally-inhomogeneous microstructures, such as PFZ layrs around reinforcements, coarse interfacial equilibrium precipitates, solute atom segregation, on deformation and fracture characteristics of the MMCs are analyzed by means of the elastic-plastic finite element analysis.
Due to the ductile nature of the PFZ layrs, concentrated plastic flow within the PFZ layrs promotes increase of effective plastic strain in the whole matrix, thereby reducing stregth of the MMCs. On the other hand, the interfacial precipitates effectively retard the concentrated plastic flow within the PFZ layrs and consequently they suppress reduction of the strength due to the formation of the PFZ.The initiation rate of the void is remarkably affected by the morphologies and density of the precipitates.
Taking above-mentioned microstructural features into account, we constructed a simulation program which simulates crack propagation through the discontinuously-reinforced. Micro-cracking, crack deflection, interaction between the main crack and the microcracks, and transition of stationary to non-stationary crack-tip singularities are taken into consideration in the simulation. Effects of the various microstructural parameters on the crack propagation resistance are evaluated. The most interesting information of this study is that the properly inhomogeneous distribution of the reinforcement improves the crack propagation resistance. We also evaluated static strength of such composites having reinforcement segregation by means of numerical simulation. The optimum microstructural configuration was proposed by the simulation.

  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] H.Toda, N.Inoue, T.Kobayashi: "Effect of PFZ layers around reinforcements on deformation behaviorsin age-hardenable aluminum matriy composites" International Symposium on Advanced Engineering Mat. 97. in press (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Toda, T.Kobayashi: "Fraeture mechanical simulation of crack propagating in discontinuously-reinforced metal matrix composite" Metall. Trans. A. 28A.10. 2149-2157 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Kobayashi, H.Toda: "Toughness enhancement based on fracture mechanical simulation of Al-Sicw composite." 5th. International Conference on Aluminum Alkys Their Physical and Mechanical Properties. vol 242. 193-198 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Kobayashi, H.Toda: "Enhancement of mechanical properties by RRA treatment" 5th. International symposium on Processing and Fabrication of Advanced Materials. 255-264 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 戸田 裕之, 小林 俊郎 和田 義治, 井上 直也: "破壊力学シミュレーションによる金属基複合材料の破壊じん性評価とミクロ組織制御法の提案" 日本金属学会誌. 59・2. 198-205 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Toda, N.Inoue, T.Kobayashi: "Effect of PFZ layrs around reinfocements on deformation behaviors in age-hardenable aluminum matrix composites" International symposium on Advanced Engineering Material 97. (in press). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Toda, T.Kobayashi: "Fracture mechanical simulation of crack propagating in discontinuously-reinforced metal matrix composite" Metall.Trans.A. Vol.28, No.10. 2149-2157 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Kobayashi, H.Toda: "Toughness enhancement based on fracture mechanical simulation of Al-SiCw composite" 5th.International conference on Aluminum Alloys Their Properties and Mechanical Properties. Vol.242. 193-198 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Kobayashi, H.Toda: "Enhancement of Mechanical properties by RRA treatment" 5th.International symposium on Processing and Fablication of Advanced Materials. 255-264 (1996)

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

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Published: 1999-03-16  

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