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Acta Mechanica Solida Sinica

, Volume 21, Issue 6, pp 573–579 | Cite as

Propagation characteristics of high order longitudinal modes in steel strands and their applications

  • Zenghua Liu
  • Su Liu
  • Bin Wu
  • Yinong Zhang
  • Cunfu He
Article

Abstract

Propagation characteristics of high order longitudinal modes of ultrasonic guided waves in seven-wire steel strands are investigated theoretically and experimentally. According to these analysis results, proper longitudinal modes are selected for defect detection in steel strands. Dispersion curves for helical and central wires in a 17.80 mm nominal diameter seven-wire steel strand are numerically obtained firstly, and propagation characteristics of high-order longitudinal modes, such as wave structures, attenuation and dispersion, are analyzed. In experiments, the signals of ultrasonic guided wave at different high frequencies are excited and received at one end of a steel strand by using the same single piezoelectric transducer. The identification of longitudinal modes in the received signals is achieved based on short time Fourier transform. Furthermore, appropriate L(0, 5) mode at 2.54 MHz is chosen for detecting an artificial defect in a helical wire of the steel strand. Results show that high order longitudinal modes in a high frequency range with low dispersion and attenuation whose energy propagates mainly in the center of the wires can be used for defect detection in long range steel strands.

Key words

steel strand ultrasonic guided waves longitudinal modes dispersion attenuation 

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Copyright information

© The Chinese Society of Theoretical and Applied Mechanics and Technology 2008

Authors and Affiliations

  • Zenghua Liu
    • 1
  • Su Liu
    • 1
  • Bin Wu
    • 1
  • Yinong Zhang
    • 1
  • Cunfu He
    • 1
  1. 1.College of Mechanical Engineering and Applied Electronics TechnologyBeijing University of TechnologyBeijingChina

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