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Crack Identification by Source Inversion Analysis of AE Wave Motions

Research Project

Project/Area Number01850111
Research Category

Grant-in-Aid for Developmental Scientific Research (B).

Allocation TypeSingle-year Grants
Research Field コンクリート工学・土木材料・施工
Research InstitutionKumamoto University

Principal Investigator

OHTSU Masayasu  Kumamoto Univ., Faculty : Assoc. Prof. of Engineering, 工学部, 助教授 (80109016)

Project Period (FY) 1989 – 1990
Project Status Completed(Fiscal Year 1990)
Budget Amount *help
¥1,800,000 (Direct Cost : ¥1,800,000)
Fiscal Year 1990 : ¥800,000 (Direct Cost : ¥800,000)
Fiscal Year 1989 : ¥1,000,000 (Direct Cost : ¥1,000,000)
KeywordsAcoustic Emission / Source Inversion Analysis / Crack Mechanisms
Research Abstract

The aim of the present research is to develop a technique which can identify crack kinematics from acoustic emission (AE) wave motions. Theoretically, AE waveforms are represented by an integral formulation based on the boundary element method (BEM). Introducing a dislocation model as a mathematical model for a crack, the moment tensor representation is derived.
The moment tensor consists of elastic constants, a direction vector of the unit normal to crack surface, and a direction vector of crack motion. Thus, crack kinematics on crack type and crack orientation are recovered, provided that six independent tensor components are fully determined. For this purpose, a computer software named SiGMA (Simplified Green's function for Moment tensor Analysis) is developed. Following the eigenvalue analysis of moment tensor components and a unified decomposition, AE sources are classified into tensile cracks and shear cracks. Crack opening direction of the tensile crack is obtained from the direction of the first eigenvector. The direction of shear motion is recovered from the directions of the first and the third eigenvectors.
The inversion procedure developed is applied to AE data on in situ hydrofracturing tests and fracture tests in concrete. Numerical studies on hydrofracturing tests confirm the reasonable accuracy of the proposed procedure. Results of cylinder-tensile tests and pullout tests of anchor bolt show a great promise for identifying crack kinematics by AE inversion procedure.

Report

(3results)
  • 1990 Annual Research Report   Final Research Report Summary
  • 1989 Annual Research Report

Research Products

(20results)

All Other

All Publications

  • [Publications] 重石 光弘,大津 政康: "コンクリ-ト構造物へのAE逆解析の適用" コンクリ-ト工学年次論文報告集. 11. 311-316 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] M.Ohtsu,M.Shigeishi and H.Iwase: "AE Observation in the PullーOut Process of Shallow Hook Anchors" 土木学会論文集. Vー11. 177-186 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] M.Ohtsu: "Inverse Inspection by Acoustic Emission based on the Boundary Element Formulation" Quality Use of Computer,PVP,ASME. 177. 201-205 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] M.Ohtsu: "Theoretical Representation of AE and Source Inversion Procedure" Elastic Waves and Ultrasonic Nondestructive Evaluation. 357-362 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 重石 光弘,大津 政康: "AE逆解析による円筒引張試験の観察" コンクリ-ト工学年次論文報告集. 12. 185-190 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] M.Shigeishi and M.Ohtsu: "Crack Kinematics by Simplified Moment Tensor Inversion of AE" Progress in Acoustic Emission. 5. 211-216 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] M. Shigeishi and M. Ohtsu: "Application of AE Source Inversion for Concrete Structures" Proc. of JCI. Vol. 11, No. 1. 311-316 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] M. Ohtsu, M. Shigeishi and H. Iwase: "AE Observation in the Pull-out Process of Shallow Hook Anchors" Proc. of JSCE. No. 408/V-11,. 177-186 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] M. Ohtsu: "Inverse Inspection by Acoustic Emission Based on the Boundary Element Formulation" Quality Use of the Computer. PVP-Vol. 177, ASME. 177-186 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] M. Ohtsu: "Theoretical Representation of AE nad Source Inversion Procedure" Elastic Waves and Ultrasonic NDE, Elsevier Science Publishers B. V.357-362 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] M. Shigeishi and M. Ohtsu: "Observation in Cylinder Tensile Test using AE Source Inversion" Proc. of JCI,. Vol. 12, No. 1. 185-190 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] M. Shigeishi and M. Ohtsu: "Crack Kinematics by Simplified Moment Tensor Inversion of AE" Progress in AE V. 211-216 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] M. Ohtsu: "Simplified Moment Tensor Analysis and Unified Decomposition of Acoustic Emission Source : Application to In Situ Hydrofracturing Test" J. of Geophys. Res.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] M.Ohtsu: "Theoretical Representation of AE and Source Inversion Procedure" Elastic Waves and Ultrasonic Nondestructive Evaluation,Elsevier Science Publishers B.V.357-362 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 重石 光弘,大津 政康: "AE波形逆解析によるコンクリ-ト円筒引張試験の観察" コンクリ-ト工学年次論文報告集. 12ー1. 185-190 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] M.Shigeishi and M.Ohtsu: "Crack Kinematics by Simplified Moment Tensor Inversion of AE" Progress in Acoustic Emission. V. 211-216 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] M.Ohtsu: "Simplified Moment Tensor Analysis and Unified Decomposition of Acoustic Emission Source:Application to In Situ Hydrofracturing Test" Journal of Geophysical Research.

    • Related Report
      1990 Annual Research Report
  • [Publications] 重石光弘・大津政康: "コンクリ-ト構造物へのAE逆解析の適用" コンクリ-ト工学年次論文報告集. 11. 311-316 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] M.Ohtsu,M.Shigeishi and H.Iwase: "AE Observation in the Pull-Out Process of Shallow Hook Anchors" 土木学会論文集. 408/V-11. 177-186 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] M.Ohtsu: "Inverse Inspection by Acoustic Emission Based on the Boundary Element Formulation" American Society of Mechanical Engineers,PVP-177. 177. 201-205 (1989)

    • Related Report
      1989 Annual Research Report

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Published : 1989-04-01   Modified : 2016-04-21  

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