A quantitative assessment of the damage mechanisms of CFRP laminates interleaved by PA66 electrospun nanofibers using acoustic emission

Reza Mohammadi, Mehdi Ahmadi Najafabadi, Hamed Saghafi, Milad Saeedifar, Dimitrios Zarouchas

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Interleaving composite laminates with nanofibrous mat is one of the most reliable methods for increasing interlaminar fracture toughness. The present study seeks to find out how the damage mechanisms of carbon fiber reinforced polymers (CFRPs), subjected to the mode-I and mode-II fracture tests, are affected while those are modified by interleaved Polyamide 66 (PA66) electrospun layers. For this goal, acoustic emission (AE) and scanning electron microscope (SEM) techniques were used for assessing the damage mechanisms. The mode-I test results showed that adding nanofibers could decrease matrix cracking, fiber breakage, and fiber/matrix debonding by 92%, 27%, and 87%, respectively. The AE demonstrated that no fiber breakage occurred during mode-II loading in both non-modified and nanomodified specimens which was validated by SEM images. On the other hand, the two other damage modes, i.e. matrix cracking and fiber/matrix debonding, decreased about 97% in the nanomodified laminates.

Original languageEnglish
Article number113395
JournalComposite Structures
Volume258
DOIs
Publication statusPublished - 2021

Keywords

  • Acoustic emission
  • Composite laminates
  • Damage mechanisms
  • Fracture modes
  • Nanofiber

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