YAMASAKI Tomohiro

写真a

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Title

Professor

Laboratory location

Sugimoto Campus

Degree 【 display / non-display

  • Osaka University -  Doctor of Engineering

Research Areas 【 display / non-display

Materials for Machines and Strength of Materials

Research Interests 【 display / non-display

Nondestructive Evaluation of Materials, Monitoring of Resin Transfer Molding Process, Electromagnetic Acoustic Transducers for Flaw Detection

Research Career 【 display / non-display

  • Monitoring of Resin Flow and Cure in Resin Transfer Molding Process by Ultrasonics

    (Individual)

    Keyword in research subject:  Fiber Reinforced Plastic, Resin Transfer Molding, Ultrasonics

  • Development of Electromagnetic Acoustic Transducers for Waveguides

    (Collaboration in Japan)

    Keyword in research subject:  Ultrasonics, Sensor, Waveguide

  • Nondestructive Evaluation of Composite Materials by Ultrasonics

    (Collaboration in Organization)

    Keyword in research subject:  Ultrasonics, Nondestructive Evaluation, Composite Materials

  • Nondestructive Stress Measurement Using Stress Dependence of Magnetostriction

    (Collaboration in Japan)

    Keyword in research subject:  Stree Measurement, Magnetostriction, Magnetoelastic Interaction

Association Memberships 【 display / non-display

  • The Japan Society of Mechanical Engineers

  • The Society of Materials Science, Japan

  • The Japan Society for Composite Materials

  • The Japanese Society for Nondestructive Inspection

Committee Memberships 【 display / non-display

  • 2010.04
    -
    2012.03

    The Japanese Society for Nondestructive Inspection  

  • 2008.04
    -
    2012.03

    The Japanese Society for Nondestructive Inspection  

Current Career 【 display / non-display

  • Osaka City University   Graduate School of Engineering   Mechanical and Physical Engineering Course   Professor  

Career 【 display / non-display

  • 2012.04
    -
    Today

    Osaka City University  

  • 1999.04
    -
    2012.03

    Osaka City University  

  • 1990
    -
    1999

    Faculty of Engineering Science, Osaka University  

Graduate School 【 display / non-display

  •  
    -
    1990

    Osaka University  Graduate School, Division of Engineering Science 

Graduating School 【 display / non-display

  •  
    -
    1984

    Osaka University   Faculty of Engineering Science  

 

Published Papers 【 display / non-display

  • Cure Monitoring in Resin Transfer Molding by Electromagnetic Acoustic Transducer

    Transactions of the Japan Society of Mechanical Engineers, Series A  76 ( 762 ) 145 - 150 2010

  • 片面温水劣化したGFRP積層板の超音波検査

    和田 明浩, 山崎 友裕, 早稲田 一嘉

    公益社団法人 日本材料学会 材料  68 ( 5 ) 436 - 442 2019  [Refereed]

     View Summary

    <p>Ultrasonic wave is applied to damage evaluation of GFRP laminate degraded by hot water from one surface. GFRP vessels have been used for storage of both acid solution and alkaline solution because of their excellent corrosion resistance. In these days, integrity evaluation of GFRP vessels has attracted much attention as the number of aged vessels increases. Although degradation proceeds gradually from the inner surface of vessels, sensors can only be attached on the outer surface. Then the through-thickness method for damage evaluation is required. In this research, GFRP plates are degraded by hot water from one surface, and through-thickness ultrasonic inspection is conducted to reveal the dependence of ultrasonic characteristics on damage state of the plates. Beside wave attenuation and velocity, characteristics of reflected waveforms from the degraded surface are analyzed. It is found that the envelope of echo from the degraded surface reflects damage propagation in the thickness direction, and it can be used as damage index of GFRP vessels.</p>

    DOI CiNii

  • Fundamental Study on Ultrasonic Detection of Uncured Region in GFRP Plates

    Akihiro Wada, Tomohiro Yamasaki, Eiji Kitagawa and Hiroshi Ito

    Journal of the Japan Society for Composite Materials  43 ( 3 ) 112 - 119 2017.05  [Refereed]

  • 超音波によるFRP板の硬化不良検出に関する基礎的検討

    和田 明浩, 山崎 友裕, 北川 英二, 伊藤 博

    一般社団法人 日本複合材料学会 日本複合材料学会誌  43 ( 3 ) 112 - 119 2017  [Refereed]

     View Summary

    <p>Ultrasonic waves are applied to detection of uncured regions in glass-fiber reinforced plastic (GFRP) plates. Polymer-based composites play an increasingly important role in the field of civil engineering because of their high specific stiffness, strength, and excellent corrosion resistance. For example, GFRP pipes are used to rehabilitate aged sewerage pipes. Uncured GFRP tubes are inserted in the aged pipes, and are then inflated and cured with steam blowing to create close-fit pipes. In this cured-in-place pipe (CIPP) method, an uncured region may be left in the GFRP pipe, so the constructed pipe must be inspected to ensure the integrity of the reinforcement. In this study, for detection of such an uncured region in GFRP structures, the effect of resin cure on ultrasonic propagation characteristics is investigated experimentally. Through-thickness and in-plane ultra-sonic measurements are conducted, and their sensitivities to resin cure are compared. In addition to wave attenuation and velocity, several AU parameters are evaluated from the power spectrum of a broadband signal. It is found that the <i>A</i>2 parameter, which represents the centroid of the power spectrum, has a good correlation with the mechanical properties of GFRP plates, and is expected to improve the detectability of uncured regions.</p>

    DOI CiNii

  • Ultrasonic Detection of Uncured Region in GFRP Laminates for Rehabilitation of Sewerage Pipes

    Akihiro WADA, Tomohiro YAMASAKI, Eiji KITAGAWA and Hiroshi ITO

    Journal of the Japan Society for Composite Materials  41 ( 4 ) 128 - 137 2015

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Review Papers (Misc) 【 display / non-display

  • Nondestructive Evaluation of Wires, Pipes and Plates by Electromagnetic Acoustic Transducers for Guided Waves

    Journal of the Japanese Society for Non-destructive Inspection  54 ( 11 ) 606 - 611 2005

  • Electromagnetic Acoustic Transducers for Longitudinal Wave in Steel Wires

    12 ( 5 ) 21 - 27 2000

  • Interaction between Magnetics and Ultrasonics

    Journal of the Japanese Society for Non- Destructive Inspection  44 ( 7 ) 492 - 497 1995

Conference Activities & Talks 【 display / non-display

  • Inspection of Lighting Pole by Electromagnetic Acoustic Transducers for Lamb Wave

    Rikuo HIGUCHI and Tomohiro YAMASAKI

    2019.11 

 

Charge of on-campus class subject 【 display / non-display

  • Mechanics of Materials

    (2019) University, Special course

  • Introduction to Solid Mechanics

    (2019) University, Special course

  • Wave Theory

    (2019) Graduate school, Special course

  • Measurement and Evaluation Engineering

    (2019) University, Special course

  • Exercise for Mechanics of Materials

    (2019) University, Special course

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