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1995 Fiscal Year Final Research Report Summary

Study on Application of Homogenization Method in Structural Engineering

Research Project

Project/Area Number 06805040
Research Category

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

Allocation TypeSingle-year Grants
Research Field 構造工学・地震工学
Research InstitutionShinshu University

Principal Investigator

MITSUI Yasushi  Shinshu University, College of Engineering Professor, 工学部, 教授 (20021008)

Co-Investigator(Kenkyū-buntansha) ENNDOU Norio  Nagano Industrial Senior Polytechnic, Dept. of Civil Eng. Research Associate, 助手 (10213597)
OUKAMI Tosiyuki  Shinshu University, Faculty of Engineering Associate Professor, 工学部, 助教授 (80152057)
TOMIDIKORO Gorou  Shinshu University, Faculty of Engineering Professor, 工学部, 教授 (30021025)
SASAGAWA Akira  Shinshu University, Faculty of Engineering Professor, 工学部, 教授 (00017922)
Project Period (FY) 1994 – 1995
Keywordshomogenization method / periodic microstructures / FEM / fiber-reinforced composite materials / mathematica formula process / average elastic constants / unsteady heat conduction problem
Research Abstract

This research investigates the applicability of homogenization method to structural analysis by some numerical experiments, in detail. In order to analyze the stress of composite materials by means of FEM,effective coefficients of the materials, such as average elastic constants must be determined by some method. Homogenization method is one of mathematical means to obtain these constants. In this research, fiber-reinfored composite materials, sometimes used as thermal materials, is analyzed in detail. Due to the thermal insulating property that most fiber-reinforced composite materials possesses, ther application under high temperature circumstances, specially like using in space vehicles, is increasing. Consequently, it is quite necessary to establish a scientific and effective method to analyze heat stress and to deal with heat conduction. The research takes the advantage that the homogenization method is applicable to any cases that composite materials is fiber-reinforced in one, t … More wo or three directions, namely, it is not needed to consider geometrical limit so seriously. Hence this method is applicable for evaluation of average heat conduction rate and expand rate. A process to evaluate these parameters is given.
In this term of project, research results gained are roughly summaried as follows :
(1)The research shows that for elastic and thermal elastic problems, it is feasible to apply homogenization method to evaluate average elastic constants and heat expand coefficients. It is found that even local stress of the composite materials can also be obtained with a high degree of accuracy by this method.
(2)With reference to unsteady heat conduction problems, if the heat conduction rate of inclusive materials is much higher than the one of fundamental materials, the constants can be evaluated exactly. Coversely, if the heat conduction rate of the former is much lower than the latter, the difference of average temperature can be found.
(3)For heat conduction or its quasi-training problems, the research reveals that if heat conduction rate of fundamental is much higher than the one of inclusive materials, homogenization method is also feasible. Less

  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] 瀬川信哉,三井康司,笹川明: "膜材の応力-ひずみ曲線からクリープを分離した材料定数評価に関する実験的研究" 構造工学論文集. 41B. 259-269 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] J.TANG,X.CAO,Y.MITSUI: "A Study on Determining the Vertical Tail Loads of an Aircraft by Strain Method" Proc.of Second Pacific International Confernce on Aerospace Science and Technology'95. 2. 159-162 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 篠川俊夫,三井康司: "ミニベンチ工法におけるトンネル挙動に関する一考察" 土木学会論文集. VI-23. 13-22 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 遠藤典男,曹西,三井康司: "塑性理論の適用による膜構造物のリンクリング現象評価" 構造工学論文集. (発表予定).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shinya Segawa, Yasushi Mitsui & Akira Sasagawa: "An experimental study on the evaluation of membrance material constants in which are distingushed creep phenomenon from the stree-strain curve." Transactions of Structural Engineering. Vol.41B. 259-269 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J.Tang, X.Cao & Y.Mitsui: "A study on determining the vertical tail loads of an aircraft by strain method." Proc. of Second Pacific International Conference on Aerospace Science and Technology'95. Vol.2. 159-162 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Toshio Shinokawa and Yasushi Mitsui: "A study of tunnel behavior during excavation by mini bench method." Transactions of the Japan Society of Civil Engineering.Vol.VI-23. 13-22 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Norio Endou, X.cao & Y.Mitsui: "Evaluation for wrinkling phenomena applying plastic theorem to membrane structures." Transactions of Structural Engineering. (having been accepted for publication).

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

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Published: 1997-03-04  

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