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Developemtn of a digital image processing system for moire analysis of strain and its application to composite materials.

Research Project

Project/Area Number 60850016
Research Category

Grant-in-Aid for Developmental Scientific Research

Allocation TypeSingle-year Grants
Research Field Aerospace engineering
Research InstitutionKyushu University

Principal Investigator

KUNOO Kazuo  Associatre Professor, Faculty of Engineering. Kyushu University., 工学部, 助教授 (90128009)

Co-Investigator(Kenkyū-buntansha) UDA Nobuhide  Research Associate, Faculty of Engineering, Kyushu University., 工学部, 助手 (20160260)
ONO Kousei  Research Associate, Faculty of Engineering, Kyushu University., 工学部, 助手 (90038092)
OHIRA Hiroichi  Professor, Faculty of Engineering, Kyushu University., 工学部, 教授 (60037687)
Project Period (FY) 1985 – 1987
Project Status Completed (Fiscal Year 1987)
Budget Amount *help
¥23,000,000 (Direct Cost: ¥23,000,000)
Fiscal Year 1987: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1986: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1985: ¥20,000,000 (Direct Cost: ¥20,000,000)
KeywordsMoire analysis of strain / Digital image processing / 平面ひずみ分布測定 / 炭素繊維強化複合材積層板 / 区分的関数補間法 / 非線型構成方程式 / ディジタル画像処理法 / 複合材 / 破損 / ひずみ計測 / 画像処理 / 構成方程式
Research Abstract

Moire analysis of strain is performed using a digital image processing system. Development of automatic control for rotation of master arid results in rapid measurements and precise setting of rotational angle, with error less than 2.8 minutes. Control of a universal testing machine using a personal computer makes if possible to load a specimen precisely in accordance with set values.
Application of moire method to carbon fibre reinforced plastic laminates is possible by adhernce of aluminum vapoured polyethylene film where grid pattern is printed. In order to get extracted moire fringes from an original image viewed by the ITC camera, wer developed image processing rechniques, such as smoothing operation to reduce noise, the local minimum search, deleting small area, deleting brances and connecting discontinuous lines. Extracted fringe data are interpolated by piece-wise linear function in a triangular sub-region. Then experimental data are expressed in a number of forms, such as contour lines of noemal stains and a shear strain, principal strain distribution and displacement of a specimen.
Comparison of the stress-strain curves obtained using this degital image processing system and those obtained using strain gauge method indicated the new system is practical. Experiments on carbon fibre reinforced plastic laminates with a hole, cut-outs and delamination are conducted and examined.

Report

(3 results)
  • 1987 Final Research Report Summary
  • 1986 Annual Research Report
  • 1985 Annual Research Report

Research Products

(13 results)

All Other

All Publications (13 results)

  • [Publications] 大平博一: 九州大学工学集報. 59. 833-840 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 大平博一: 九州出学工学集報. 60. 95-101 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Kunoo,Kazuo: Theoretical and Applied Mechanics. 36. 213-217 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Kunoo,Kazuo: Theoretical and Applied Mechanics. 37. (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Ohira, H.: "Measurement of Material Properties of Carbon/Epoxy Composites. - case of Compression" Technology Reports of Kyushu Nuiversity.59. 835-840. (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Ohira, H.: "Nonlinear Constitutive Equations for plane Stess and theia Pplication to Composite Laminates." Technology Reports of the Kyushu University.60. 95-101 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Kunoo, K.: "Digital Image Processing for Moire Analysis of Strain." Theoretical and Applied Mechanics.36. 213-217. (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Kunoo, K.: "Whole-Field Stain Measutements by Moire and their Application to Composite Materials." Teroretial and applied Mechanics.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 大平博一: 九州大学工学集報. 59. 833-840 (1986)

    • Related Report
      1986 Annual Research Report
  • [Publications] 大平博一: 九州大学工学集報. 60. 95-101 (1987)

    • Related Report
      1986 Annual Research Report
  • [Publications] Kazuo Kunoo: Theoretical and Applied Mechanics. 36. (1987)

    • Related Report
      1986 Annual Research Report
  • [Publications] 第27回構造強度に関する講演会. (1985)

    • Related Report
      1985 Annual Research Report
  • [Publications] 第35回応用力学連合講演会. (1985)

    • Related Report
      1985 Annual Research Report

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Published: 1987-03-30   Modified: 2016-04-21  

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