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<p>The delamination process in DCB specimens made of glass fiber-reinforced plastic (GFRP) was studied with the registration of acoustic emission (AE) parameters. The conventional procedure for AE signal registration was substantially modified: the hardware included two separate channels with different frequency ranges – 30–600 kHz and 0.8–200 kHz – while the software suite comprised AE Monitor, Sound Energy, and the free audio editor Audacity. Delamination growth was assessed using integral AE parameters – namely, the cumulative count, the number of events, and the AE signal energy. Due to the scatter of absolute AE values, normalized quantities were used. It was established that the normalized energy of AE signals in the 0.8–200 kHz band reflects the delamination length more reliably. Jumps in this parameter correlate with sharp drops in the applied load during specimen testing, which are associated with the growth of delamination. Complete AE spectrograms were obtained by testing double cantilever beam (DCB) specimens on GFRP within the above frequency band, revealing significant spectral components in the audible range. A procedure is proposed for determining the current delamination length in such specimens from the normalized AE energy in the 0.8–200 kHz band.</p>

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Assessment of Mode I Delamination Growth in Glass Fiber-Reinforced Plastic Using the Acoustic Emission Method

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • O. V. Drozdov,
  • Yu. M. Volkov

摘要

The delamination process in DCB specimens made of glass fiber-reinforced plastic (GFRP) was studied with the registration of acoustic emission (AE) parameters. The conventional procedure for AE signal registration was substantially modified: the hardware included two separate channels with different frequency ranges – 30–600 kHz and 0.8–200 kHz – while the software suite comprised AE Monitor, Sound Energy, and the free audio editor Audacity. Delamination growth was assessed using integral AE parameters – namely, the cumulative count, the number of events, and the AE signal energy. Due to the scatter of absolute AE values, normalized quantities were used. It was established that the normalized energy of AE signals in the 0.8–200 kHz band reflects the delamination length more reliably. Jumps in this parameter correlate with sharp drops in the applied load during specimen testing, which are associated with the growth of delamination. Complete AE spectrograms were obtained by testing double cantilever beam (DCB) specimens on GFRP within the above frequency band, revealing significant spectral components in the audible range. A procedure is proposed for determining the current delamination length in such specimens from the normalized AE energy in the 0.8–200 kHz band.