Defect detection of concrete in infrastructure based on Rayleigh wave propagation generated by laser-induced plasma shock waves

Sho Wakata, Naoki Hosoya, Noboru Hasegawa, Masaharu Nishikino

研究成果: Article査読

3 被引用数 (Scopus)

抄録

Defects in large concrete structures, including critical infrastructure such as bridges and tunnels, are traditionally detected by hammering tests by inspectors. However, the results depend on the inspectors’ skills. Additionally, hammering tests are impractical to thoroughly inspect massive structures in a short time. Herein defect detection in concrete structures is realized by telemetry using shock waves generated by laser-induced plasma (LIP). LIP is generated by irradiating a Nd:YAG pulsed laser near the concrete surface. As LIP spreads to the surrounding area at an ultrafast speed, a spherical shock wave is generated. This shock wave realizes a non-contact, non-destructive impulse excitation force on a concrete structure. The response of the concrete structure is measured with a laser Doppler vibrometer (LDV). Applying this method to detect defects in an artificial concrete specimen can identify the natural frequencies and modes of the defects. By measuring the propagation of the Rayleigh waves generated by the LIP shock waves, defects and the approximate location of the boundary between the defective part and the defect-free part are detected.

本文言語English
論文番号107039
ジャーナルInternational Journal of Mechanical Sciences
218
DOI
出版ステータスPublished - 2022 3月 15

ASJC Scopus subject areas

  • 土木構造工学
  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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