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1992 Fiscal Year Final Research Report Summary

Research on Nondestructive Evaluation of a Crack Existing at Weld by Means of D-C Potential Drop Technique

Research Project

Project/Area Number 02555021
Research Category

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

Allocation TypeSingle-year Grants
Research Field 材料力学
Research InstitutionTohoku University

Principal Investigator

ABE Hiroyuki  Tohoku University, Faculty of Engineering,Professor, 工学部, 教授 (00005266)

Co-Investigator(Kenkyū-buntansha) TAKIGUCHI Hayao  System Design Corporation, Dept. of Development, Director, 開発部, 部長
SAKA Masumi  Tohoku University,Faculty of Engineering,Associate Professor, 工学部, 助教授 (20158918)
SHOJI Tetsuo  Tohoku University,Faculty of Engineering,Professor, 工学部, 教授 (80091700)
Project Period (FY) 1990 – 1992
KeywordsCrack / Nondestructive Evaluation / Potential Drop / Direct Current / Weld / Inverse Problem / Fracture Mechanics / Computational Mechanics
Research Abstract

The research has been performed to develop a method based on d-c potential drop technique for evaluating nondestructively a crack at weld. The main results are summarized as follows:
1. A method was presented for the nondestructive evaluation of a 2-D crack on the back wall of an infinite strip having weldment. The crack geometry in the strip having the weldment was determined by combining simple problems of a cracked strip without the weldment and a welded strip without the crack.
2. A new procedure was proposed to evaluate a 3-D crack shape nondestructively with high accuracy by utilizing the d-c potential method. An elliptical embedded crack and a semielliptical surface crack on the back wall in a plate were evaluated especially with respect to location , length and inclination of the crack. Furthermore a nondestructive procedure was developed to evaluate a 3-D shape of a crack in a welded plate, where the electrical and geometrical inhomogeneity of the weldment was considered, and the effect was calibrated. The availability of the presented procedures was verified by experiments stainless steels.
3. Effects of closure on an evaluated value of crack size were examined experimentally, where the evaluation was carried out by using d-c electrical potential method. It was found that the potential method is able to give valid evaluation for close cracks, provided that the applied load is free or tensile.
4. A simplified method was developed for applying potential drop technique to nondestructieve evaluation of a 3-D crack on the inner surface of a welded pipe. The method was based on 2-D theoretical analysis with modification for considering the actual 3-D nature of current flow.

  • Research Products

    (20 results)

All Other

All Publications (20 results)

  • [Publications] H.ABE(Y.KANOH): "An Inverse Problem in Nondestructive Inspection of a Crack in a Plate with an Inhomogeneity by Means of the Electrical Potential Method" Micromechanics and Inhomogeneity,The Toshio Mura Anniversary Volume. 1-15 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 坂 真澄: "き裂非破壊評価への電磁気の応用" 機械の研究. 44. 153-156 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 嘉納 豊(阿部 博之): "直流電位差法による三次元き裂の形状評価法の提案" 日本機械学会論文集(A). 58. 412-419 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 嘉納 豊(阿部 博之): "直流電位差法による溶接部に存在する三次元き裂の形状評価" 日本機械学会論文集(A). 58. 420-425 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.SAKA(D.YUASA,H.ABE and K.SUGINO): "Nondestructive Characterization of Bifurcated Crack by Potential Drop Technique" Nondestr.Test.Eval.7. 61-72 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 坂 真澄(板垣 文雄,阿部 博之): "分岐き裂回りの電流場に誘起される磁場の解析" 日本機械学会東北支部第27期総会講演会講演論文集,No.921-1. 99-101 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 坂 真澄(原 弘一,阿部 博之): "配管溶接部き裂の直流電位差法による非破壊簡易評価" 日本機械学会東北支部第28期総会講演会講演論文集,No.931-1. 123-125 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.SAKA(D.YUASA,H.ABE,K.SUGINO and H.KAGEYAMA): "Potential Drop Technique for Nondestructive Evaluation of Bifurcated Crack in Rail" Nondestr.Test.Eval.(1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.KIM(M.NAKAJIMA and T.SHOJI): "Advanced ACPD method for NDI" ASME Pressure Vessels and Piping Division Conf.on Fracture Mechanics in Pressure Vessels and Piping,(June25-29,1993). (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 坂 真澄(分担執筆): "最新応力・ひずみ測定・評価技術" 総合技術センター, 687 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H. Abe (Y.Kanoh): "An Inverse Problem in Nondestructive Inspection of a Crack in a Plate with an Inhomogeneity by Means of the Electrical Potential Method" Proc. Micromechanics and Inhomogeneity. The Toshio Mura 65th Anniversary Volume. 1-15 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Saka: "Application of Electromagnetism to Nondestructive Evaluation of Cracks" Science of Machine. 44-1. 153-156 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y. Kanoh (H. Abe): "Proposal for Nondestructive Evaluation Procedure of 3-D Crack Shape by Means of Electrical Potential Method" Trans. Jpn. Soc. Mech. Eng. 58-547,A. 412-419 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Kanoh (H. Abe): "Nondestructive Evaluation of 3D Crack in Weld by Means of Electrical Potontial Mothod" Trans. Jpn. Soc. Mech. Eng.58-547,A. 420-425 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Saka (D. Yuasa, H. Abe and K. Sugino): "Nondestructive Characterization of Bifurcated Crack by Potential Drop Technique" Nondestr. Test Eval.7-[1-6. 61-72 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Saka (F. Itagaki and H. Abe): "Analysis of Magnetic Field Induced by Current Flow around a Bifurcated Crack" Prepr. of Jpn. Soc. Mech. Eng.921-1. 99-101 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Saka (K. Hara and H. Abe): "Simplified Application of Potential Drop Technique to NDE of a Crack in a Pipe with Weld" Prepr. of Jpn. Soc.Mech. Eng.931-1. 123-125 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Saka (D. Yuasa, H. Abe, K. Sugino and H. Kageyama): "Potential Drop Technique for Nondestructive Evaluation of Bifurcated in Rail" Nondestr. Test Eval.(1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Kim (M. Nakajima and T. Shoji): "Advanced ACPD Method for NDI" ASME Conf. on Fract. Mach. Vessels and Piping. (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Saka: "Potential Drop Technique" New Techniques for Measuring and Evaluating Stress and Strain, Sogo Gijutsu Center. 393-401 (1993)

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

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Published: 1994-03-24  

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