超音波によるFRP板の硬化不良検出に関する基礎的検討  [in Japanese] Fundamental Study on Ultrasonic Detection of Uncured Region in GFRP Plates  [in Japanese]

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Author(s)

    • 和田 明浩 WADA Akihiro
    • 神戸市立工業高等専門学校機械工学科 Department of Mechanical Engineering, Kobe City College of Technology
    • 北川 英二 KITAGAWA Eiji
    • 芦森工業株式会社機能製品事業本部 High Performance Product Business Division, Ashimori Industry Co., LTD.
    • 伊藤 博 ITO Hiroshi
    • 芦森工業株式会社機能製品事業本部 High Performance Product Business Division, Ashimori Industry Co., LTD.

Abstract

<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>

Journal

  • Journal of the Japan Society for Composite Materials

    Journal of the Japan Society for Composite Materials 43(3), 112-119, 2017

    The Japan Society for Composite Materials

Codes

  • NII Article ID (NAID)
    130007383373
  • NII NACSIS-CAT ID (NCID)
    AN00196748
  • Text Lang
    JPN
  • ISSN
    0385-2563
  • NDL Article ID
    028286136
  • NDL Call No.
    Z14-655
  • Data Source
    NDL  J-STAGE 
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