The effect of mode II fatigue crack growth rate on the fractographic features of CFRP composite laminates: An acoustic emission and scanning electron microscopy analysis

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

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The present study is focused on the characterization of the fatigue damage features in carbon/epoxy laminates under mode-II loading conditions. To this aim, a sinusoidal cyclic load was applied to the End-Notched Flexural (ENF) specimens and the fatigue behavior of specimens was investigated. Scanning Electron Microscope (SEM) was used to identify the damage features on the fracture surface, i.e. fiber imprints, cusps, roller cusps, and striations. It was found that the fatigue damage features, such as cusps and striations, completely depended on the fatigue crack growth rate, da/dN. In addition, a linear relationship between the fatigue striation space and the strain energy release rate range (ΔGs) and the hysteresis loop area was established. The Acoustic Emission (AE) method was also employed to characterize the damage features. The obtained results showed that higher AE energy indicates larger and rougher cusps and striation features.

Original languageEnglish
Article number107408
Number of pages14
JournalEngineering Fracture Mechanics
Volume241
DOIs
Publication statusPublished - 2021

Keywords

  • Acoustic emission
  • Carbon/epoxy laminate
  • Fatigue damages features
  • Mode-II loading
  • SEM analysis

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