Barely visible impact damage assessment in laminated composites using acoustic emission

Milad Saeedifar, Mehdi Ahmadi Najafabadi*, Dimitrios Zarouchas, Hossein Hosseini Toudeshky, Meisam Jalalvand

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

91 Citations (Scopus)
62 Downloads (Pure)


Despite the key advantages of Fiber Reinforced Polymer (FRP) composites, they are susceptible to Barely Visible Impact Damage (BVID) under transverse loadings. This study investigates BVID in two quasi-isotropic carbon/epoxy laminates under quasi-static indentation and Low-Velocity Impact (LVI) loadings using Acoustic Emission (AE). First, the evolution of interlaminar and intralaminar damages is studied by analyzing the AE signals of the indentation test using b-value and sentry function methods. Then, the specimens are subjected to the LVI loading and the induced damages are compared with the indentation test and the percentage of each damage mechanism is calculated using Wavelet Packet Transform (WPT). In consistent with the mechanical data, ultrasonic C-scan and digital camera images of the specimens, the AE results show a considerable similarity between the induced BVID under quasi-static indentation and LVI tests. Finally, the obtained results show that AE is a powerful tool to study BVID in laminated composites under quasi-static and dynamic transverse loadings.

Original languageEnglish
Pages (from-to)180-192
Number of pages13
JournalComposites Part B: Engineering
Publication statusPublished - 1 Nov 2018

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.


  • Acoustic emission
  • B-value
  • Barely visible impact damage
  • Indentation
  • Laminated composites
  • Low-velocity impact
  • Sentry function
  • Wavelet packet transform


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