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1991 Fiscal Year Final Research Report Summary

Estimation o inside stress distribution and destruction of metal using nonlinear dependency of sound velocity on stress

Research Project

Project/Area Number 02402037
Research Category

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

Allocation TypeSingle-year Grants
Research Field 計測・制御工学
Research InstitutionTokyo Institute of Technology

Principal Investigator

SATO Takuso  Tokyo Institute of Technology, The Graduate School at Nagatsuta, Department of Precision Machinery Systems, Professor, 大学院総合理工学研究科, 教授 (20016760)

Co-Investigator(Kenkyū-buntansha) SASE Mikiya  Tokyo Institute of Technology, The Graduate School at Nagatsuta, Department of P, 大学院総合理工学研究科, 助手 (20225907)
KOSUGI Yukio  Tokyo Institute of Technology, The Graduate School at Nagatsuta, Department of P, 大学院総合理工学研究科, 助教授 (30108237)
Project Period (FY) 1990 – 1991
KeywordsNondestructive / Ultrasonic Waves / Stress Perturbation / Metals Condition
Research Abstract

The objective of the research was the development of new techniques for evaluation of the condition of metals by using nonlinear dependence of ultrasound velocity on the stress. Especially the use of stress perturbation generating pumping waves and the velocity change detecting ultrasonic probing waves is key point for localization or imaging of the condition inside of metals from the detection of the interaction at the crossing region of the two waves. First, i) the nonlinear dependency of sound velocity on stress is examined by using newly obtained stress-strain system and ultrasonic wave system of 50 MHz, then ii) the nonlinear relation is formulated by using equivalent linear and 2nd and 3rd order nonlinear elastic constants and these values are derived from the experimental results. iii) The pumping system which gives about 1 Mpa stress perturbation of 5 musec duration inside metal is constructed and the probing wave of 50 MHz which can detect 0.01 degree of dynamic phase change is also constructed. iv) They are used to measure local nonlinear elastic constants of metal. v) A new characteristic value to evaluate the state of metal is introduced as a function of the nonlinear elastic constants. Finally, as an example, vi) it is applied for the evaluation of elastic deformation limiting stress value inside of metal and the usefulness for the prediction of destruction of metal is demonstrated.

  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] 馬 為民,佐藤 拓宋,小杉 幸夫,佐藤 直人,小黒 和昭: "音速の応力への非直線的依存性の金属内部弾性限界推定への応用" 非破壊検査誌. (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] W.Ma,T.Sato,Y.Kosugi: "Generation of stress perturbation monopole wave in metal by electromagnetic method" 14th International Congress on Acoustics. (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Ninoyu,T.Sato,K.Jhang,Y.kosugi: "Nonlinear Elasto-Acoustics Applied Measuring System" 14th International Congress on Acoustics. (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Sato,W.Ma,H.Ninoyu,K.Jhang,Y.Kosugi: "Estimation of stress state inside of metal using stress perturbing pump waves and sound velocity change detecting prode waves" 13th World Conference on Nondestruction Testing. (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 馬 為民,佐藤 拓宋,小杉 幸夫: "金属中への単峰性応力摂動波の発生" 第38回応用物理学関係関連講演会予稿集. (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 馬 為民,佐藤 拓宋: "アルミニウム中の弾性限界の音弾性的計測" 第39回応用物理学関係関連講演会予稿集. (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takuso Sato Ed.M.F.Hamilton et al.: ""Industrial and medical applications of nonlinear acoustics" p98-Frontiers of Nonlinear Acoustics" Elsevier Akpplied Science, 1990

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T. Sato: "Industrial and medical applications of nonlinear acoustics" Frontiers of Nonlinear Acoustics, Elasevier Applied Science. 98 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] W. Ma, T. Sato, Y. Kosugi, N. Sato, K. Oguro: "Application of nonlinear dependence of sound velocity on stress for estimation of elastic limit inside of metal" Japanese Journal of Nondestructive Testing. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] W. Ma, T. Sato, Y. Kosugi: "Generation of stress perturbation monopole wave in metal by electromagnetic method" 14th International Congress on Acoustics. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Ninoyu, T. Sato, K. Jhang, Y. Kosugi: "Nonlinear Elasto-Acoustics Applied Measureing System" 14th International Congress on Acoustics. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Sato, W. Ma, H. Ninoyu, K. Jhang, Y. Kosugi: "Estimation of stress state inside of metal using stress perturbing pump waves and sound velocity change detecting probe waves" 13th World Conference on Nondestructive Testing. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] W. Ma, T. Sato, Y. Kosugi: "Generation of monopole stress perturbation wave in metal" 38th Joint Conference of Applied Physics. (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] W. Ma, T. Sato: "Elasto-acoustical measurement of elastic limit of Al." 39th Joint Conference of Applied Physics. (1992)

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

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Published: 1993-03-16  

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