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

Journal Article (2021)
Author(s)

Reza Mohammadi (Amirkabir University of Technology)

Mehdi Ahmadi Ahmadi Najafabadi (Amirkabir University of Technology)

Hamed Saghafi (Amirkabir University of Technology, Tafresh University)

M Saeedifar (TU Delft - Structural Integrity & Composites)

Dimitrios Zarouchas (TU Delft - Structural Integrity & Composites)

Research Group
Structural Integrity & Composites
Copyright
© 2021 R. Mohammadi, Mehdi Ahmadi Najafabadi, Hamed Saghafi, M. Saeedifar, D. Zarouchas
DOI related publication
https://doi.org/10.1016/j.engfracmech.2020.107408
More Info
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Publication Year
2021
Language
English
Copyright
© 2021 R. Mohammadi, Mehdi Ahmadi Najafabadi, Hamed Saghafi, M. Saeedifar, D. Zarouchas
Research Group
Structural Integrity & Composites
Bibliographical Note
Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care 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. @en
Volume number
241
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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.

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