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1998 Fiscal Year Final Research Report Summary

DEVELOPMENT OF LOW FREQUENCY ACOUSTIC MICROSCOPE

Research Project

Project/Area Number 08555024
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section展開研究
Research Field Materials/Mechanics of materials
Research InstitutionNAGOYA INSTITUTE OF TECHNOLOGY

Principal Investigator

KAWASHIMA Koichiro  NAGOYA INSTITUTE OF TECHNOLOGY,FACULTY OF ENGINEERING,PROFESSOR, 工学部, 教授 (50023239)

Co-Investigator(Kenkyū-buntansha) OKADE Motohiro  AISIN SEIKI CO., R&D CENTER,RELIABILITY DEPARTMENT,MANAGER, 技術研究所, 課長
ISHIKAWA Isao  HITACHI CONSTRUCTION MACHINERY FA DIVISION,SENIOR RESEARCHER, FA事業部, 主任研究員
FUJII Ikuya  NAGOYA INSTITUTE OF TECHNOLOGY , FACULTY OF ENGINEERING,RESEARCH ASSOCIATE, 工学部, 助手 (90283481)
ITO Toshihiro  NAGOYA INSTITUTE OF TECHNOLOGY , FACULTY OF ENGINEERING,LECTURER, 工学部, 講師 (20203151)
Project Period (FY) 1996 – 1998
KeywordsACOUSTIC MICROSCOPE / ULTRASOUND / NONDESTRUCTIVE EVALUATION / WAVE PROPAGATION / FLAW DETECTION / SURFACE WAVE VELOCITY / NUMERICAL SIMULATION / MATERIAL CHARACTERIZATION
Research Abstract

The purpose of this project is to develop a low frequency acoustic microscope which measures precisely the velocities and attenuation of the leaky surface waves and visualize small defects within solids, with lens-less focused ultrasonic transducers operated at frequency less than 5OMHz and digital signal processing. The main results are summarized in the following.
1. A digital measurement system has established for precise velocity measurement of the leaky creeping, surface SY and Rayleigh waves as well as attenuation measurement of the leaky Rayleigh wave.
2. The mass density within a surface layer has estimated with the measured velocities and 'attenuation mentioned above and equation of leaky surface waves. The measured density of aluminum alloy and fused quartz agrees with bulk density within 10%.
3. With dynamic finite element method, the wave propagation in water and solid has analyzed for a model of line focused transducer and aluminum plate. The velocities of the leaky creeping and Rayleigh waves thus calculated agree with the measured within 2%.
4. The change in Young's modulus in a functional gradient Al2O3/Ni ceramics has been estimated with the measured velocities of the leaky Rayleigh and longitudinal waves.
5. A sizing method of minute defects far less than the focused beam diameter is proposed, where the reflection amplitude from defects is reduced by that of the wide plane at the same depth. The spherical voids of 50 mu m in ceramics is estimated within 20%.
6. The growth or healing of spall damage within a target plate under repeated high velocity impacts is well visualized with a lens-less point focused PVDF transducer, from which we can monitor nondestructively the evolution process of internal voids or cracks.

  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] 藤井・川嶋・佐藤: "PVDF線集束型超音波センサーを用いた漏洩レーリー波, 漏洩ク…" 日本機械学会論文集A. 63. 2444-2448 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 川嶋・西村・稲守・伊藤: "繰り返し高速衝撃下でのアルミニウムのスポール損傷の非破壊的観察" 材料. 47. 14-19 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Kawashima, I.Fujii et al.: "Determination of mass density and elastic constants in surface layer with…" Nondestructive Characterization of Materials. VIII. 707-712 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Kawashima, N.Nishimura et al.: "Ultrasonic imaging of spall damage under repeated impacts with C-scan…" Review of Progress in Quantitative Nondestructive Evaluation. 17. 1517-1522 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 伊藤・川嶋・森・表: "線集束超音波探触子により励起された漏洩表面波伝播の有限要素法解析" 日本機械学会論文集A. 65. 589-596 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Nishimura et al.: "Sizing of a small voids less than focused beam diameter with C-scan…" Proc.1998 IEEE Ultrasonic Symposium. (in press).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Kawashima, I.Fujii, T.Satoh and M.Okade: "Measurement of acoustoelastic coefficients with leaky surface wave" Review of Progress in Quantitative Nondestructive Evaluation. Vol.16. 1135 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Okade, K.Kawashima, T.Satoh, I.Fujii, Y.Ikeda: "Nondestructive evaluation of surface properties of sintered Si_3N_4 ceramics with surface wave dispersion" Review of Progress in Quantitative Nondestructive Evaluation. Vol.16. 1509 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kawashima, S.Ohta, T.Mizutani, N.Nishimura I,Ishikawa: "Enhancement of B- and C-scan images of C-SAM with an acoustic matching layer" Review of Progress in Quantiative Nondestructive Evaluation. Vol.16. 805 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] I.Fujii, K.Kawashima, T.Sato: "Velocity measurement of leaky creeping, surface SV and Rayleigh waves with line-focused PVDF transducers (in Japanese)" Transactions of the Japan Society of Mechanical Engineers. A63. 2444 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kawashima, N.Nishimura, T.Inamori, T.Ito: "Nondestructive monitoring of spall damage within aluminum targets under repeated high velocity impacts (in Japanese)" Journal of the Society of Material science, Japan. 47. 14 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kawashima, I.Fujii and N.Takenouti: "Determination of mass density and elastic constants in surface layer with leaky surface waves" Nondestructive Characterization of Materials. VIII. 707 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kawashima, N.Nishimura, T.Takano, O.Nakayama: "Ultrasonic imaging of spall damage under repeated Impact with C-scan acoustic microscope" Review of Progress in Quantitative Nondestructive Evaluation. Vol.17. 1517 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kawashima, T.Ito, N.Takenouchi, R.Omote: "Attenuation of leaky Rayleigh wave ; Experiment and numerical simulation" Review of Progress in Quantitative Nondestructive Evaluation. Vol.18. 175 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N.Nishimura, K.Kawashima, Y.Ikeda: "Sizing of a small voids less than focused beam diameter with C-scan acoustic microscope" Proc.1998 IEEE Ultrasonic Symposium. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kawashima, I.Fujii, N.Takenouchi: "Time-domain measurement of velocities and attenuation with low frquency acoustic microscope" Proc.1998 IEEE Ultrasonic Symposium. (in press).

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

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Published: 1999-12-08  

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