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Responses of Angle-Beam Ultrasonic Shear Waves to Closed Cracks and Highly Sensitive Quantitative Nondestructive Evaluation of Crack Sizes Together With Closure Stresses

Research Project

Project/Area Number 12450041
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Materials/Mechanics of materials
Research InstitutionTohoku University

Principal Investigator

SAKA Masumi  Tohoku University, Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (20158918)

Co-Investigator(Kenkyū-buntansha) KAMIYA Shoji  Tohoku University, Graduate School of Engineering, Associate Professor, 大学院・工学研究科, 助教授 (00204628)
SOYAMA Hitoshi  Tohoku University, Graduate School of Engineering, Associate Professor, 大学院・工学研究科, 助教授 (90211995)
MIHARA Tsuyoshi  Tohoku University, Graduate School of Engineering, Associate Professor, 大学院・工学研究科, 助教授 (20174112)
Project Period (FY) 2000 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥15,800,000 (Direct Cost: ¥15,800,000)
Fiscal Year 2001: ¥5,100,000 (Direct Cost: ¥5,100,000)
Fiscal Year 2000: ¥10,700,000 (Direct Cost: ¥10,700,000)
KeywordsUltrasonics / Closed Crack / Shear Wave / Ultrasonic Angle-Beam Technique / Inverse Problem / Crack Closing Stress / Crack Depth / Sensitivity / 斜角探傷
Research Abstract

1. Clarification of angle-beam shear wave responses to closed cracks and its mechanism
Specimens containing two-dimensional (2D) fatigue cracks with different crack depths and closing stresses were prepared, and the cracks situated vertically on the specimen back-wall were inspected. The beam angle for achieving considerable sensitivity in shear wave response for a wide range of cracks was estimated as 50°.
2. Construction of theoretical model of angle-beam shear wave response to closed crack
By taking care of the shape of the response curve that contains the simultaneous information of crack depth and closing stress, the model of angle-beam shear wave response has been proposed.
3. Evaluation of crack size and closing stress by inverse analysis
(1) Verification for small two-dimensional closed cracks
A relation between the amplitude of the crack echo and the crack depth for open cracks was determined. Then, another relation between the reflection coefficient, which is defined by the ratio of echo-height of closed, crack to that of open crack, and crack closure stress was obtained. Finally, by using the model of closed crack response constructed in the previous section 2, which contains these relations, the values of crack closure stress and crack depth of an unknown 2D crack have been determined by solving an inverse problem.
(2) Extension to shallow three-dimensional closed cracks
The methodology of evaluating 2D closed crack was extended to shallow 3D closed crack. Since a small segment of length of a 3D shallow crack can be approximated as a segment of 2D crack, the inverse analysis for the response measured at the center of each segment was individually performed.
(3) Verification for shallow three-dimensional closed cracks
Crack closure stress and the crack tip contour of a 3D closed crack were determined by the technique developed in the above section (2).

Report

(3 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • Research Products

    (26 results)

All Other

All Publications (26 results)

  • [Publications] S.R.Ahmed (M.Saka): "Effect of Plate Thickness on the Ultrasonic NDE of Small Closed Surface Cracks"Proc.Int.Workshop on Sensing and Evaluation of Materials System. 48-55 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M.A.Salam Akanda (M.Saka): "Enhancement of Sensitivity of Ultrasonic Nondestructive Evaluation of Small Closed Cracks"Proc.Int.Workshop on Sensing and Evaluation of Materials System. 56-63 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M.A.サラム アカンダ (坂 真澄): "超音波横波による微小き裂の高感度検出と評価"日本機械学会東北支部多賀城地方講演会講演論文集. 81-82 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M.A.サラム アカンダ (坂 真澄): "超音波パルスエコー法によるき裂閉口圧の評価"日本機械学会2001年度年次大会講演論文集. 6. 205-206 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M.A.Salam Akanda (M.Saka): "Influence of Crack Length on the Ultrasonic Evaluation of Depth of Small Surface Cracks"Proc.Asian Pacific Conf.on Fracture and Strength '01 and Int.Conf.Advanced Technology in Experimental Mechanics '01. 1. 253-257 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] S.R.Ahmed (M.Saka): "Toward a Sensitive Detection and Sizing of Small Closed Cracks by Ultrasonic Shear Waves"Proc.Asian Pacific Conf.on Fracture and Strength '01 and Int.Conf.Advanced Technology in Experimental Mechanics '01. 1. 258-263 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 坂 真澄: "超音波による閉じたき裂の非破壊評価-最新の対策技術"検査技術. 6. 1-5 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 坂 真澄: "閉じたき裂の非破壊評価"日本機械学会関西支部第77期定時総会講演会 講演論文集. (印刷中). (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M.A.Salam Akanda (M.Saka): "Ultrasonic Shear Wave Technique for Sensitive Detection and Sizing of Small Closed Cracks"JSME International Journal. (印刷中). (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] S. R. Ahmed (M. Saka): "Effect of Plate Thickness on the Ultrasonic NDE of Small Closed Surface Cracks"Proc. Int. Workshop on Sensing and Evaluation of Materials System. 48-55 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M. A. Salam Akanda ( M. Saka ): "Enhancement of Sensitivity of Ultrasonic Nondestructive Evaluation of Small Closed Cracks"Proc. Int. Workshop on Sensing and Evaluation of Materials System. 56-63 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M. A. Salam Akanda ( M. Saka ): "Sensitive Detection and Sizing of Small Cracks by Ultrasonic Shear Wave"Proc. JSME Tohoku Branch, Tagajo Local Meeting. No. 001-2. 81-82 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M. A. Salam Akanda ( M. Saka ): "Evaluation of Crack Closing Stress by Ultrasonic Pulse-Echo Technique"Proc. 2001 JSME Annu. Meeting. Vol. 6, No. 01-1. 205-206 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] S. R. Ahmed ( M. Saka ): "Influence of Crack Length on the Ultrasonic Evaluation of Depth of Small Surface Cracks"Proc. Asian Pacific Conf. on Fracture and Strength '01 and Int. Conf. Advanced Technology in Experimental Mechanics '01. 253-257 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M. A. Salam Akanda ( M. Saka ): "Toward a Sensitive Detection and Sizing of Small Closed Cracks by Ultrasonic Shear Waves"Proc. Asian Pacific Conf. on Fracture and Strength '01 and Int. Conf. Advanced Technology in Experimental Mechanics '01. 258-263 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M. Saka: "Nondestructive Evaluation of Closed Cracks by Ultrasonics - New Techniques"Inspection Engineering. Vol. 6, No. 11. 1-5 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M. Saka: "Nonaestructive Evaluation of Closed Cracks"Proc. 77th JSME Kansai Branch Meeting. (in press). (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M. A. Salam Akanda ( M. Saka ): "Ultrasonic Shear Wave Technique for Sensitive Detection and Sizing of Small Closed Cracks"JSME Int. J.. (in press). (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M.A.サラム アカンダ (坂 真澄): "超音波パルスエコー法によるき裂閉口圧の評価"日本機械学会2001年度年次大会講演論文集. Vol.VI. 205-206 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] S.Reaz Ahmed (M.Saka): "Influence of Crack Length on the Ultrasonic Evaluation of Depth of Small Surface Cracks"Proc. Asian Pacific Conf. on Fracture and Strength '01 and Int. Conf. Advanced Technology in Experimental Mechanics '01. Vol.1. 253-257 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] M.A.Salam Akanda (M.Saka): "Toward a Sensitive Detection and Sizing of Small Closed Cracks by Ultrasonic Shear Waves"Proc. Asian Pacific Conf. on Fracture and Strength '01 and Int. Conf. Advanced Technology in Experimental Mechanics '01. Vol.1. 258-263 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 坂 真澄: "超音波による閉じたき裂の非破壊評価"検査技術. 6・11. 1-5 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 坂 真澄: "閉じたき裂の非破壊評価"日本機械学会関西支部 第77期定時総会講演会講演論文集. (発表予定). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] M.A.サラム アカンダ(坂真澄): "超音波横波による微小き裂の高感度検出と評価"日本機械学会東北支部多賀城地方講演会講演論文集. No.001-2. 81-82 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] S.Reaz Ahmed(M.Saka): "Effect of Plate Thickness on the Ultrasonic NDE of Small Closed Surface Cracks"Proc.Int.Workshop on Sensing and Evaluation of Materials System. 48-55 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] M.A.Salam Akanda(M.Saka): "Enhancement of Sensitivity of Ultrasonic Nondestructive Evaluation of Small Closed Cracks"Proc.Int.Workshop on Sensing and Evaluation of Materials System. 56-63 (2000)

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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