Investigation and identification of damage mechanisms of unidirectional carbon/flax hybrid composites using acoustic emission

Ameur, Mariem Ben; Mahi, Abderrahim El; Rebière, Jean-Luc; Gimenez, Isabelle; Beyaoui, Moez; Abdennadher, Moez; Haddar, Mohamed

doi:10.1016/j.engfracmech.2019.106511

Cited by 52 publications

(25 citation statements)

References 44 publications

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“…Finally, the delamination, the fiber pull-out and the fiber breakage occurred near 40% of tensile loading at the failure. Such an investigation 45 under cyclic loadings indicated that matrix cracking had the greatest activity and fiber-matrix debonding had less activity. The delamination appeared from the first stage of fatigue tests and it was less than those of matrix cracking and fiber-matrix debonding.…”

Section: Resultsmentioning

confidence: 99%

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Cumulative acoustic emission energy for damage detection in composites reinforced by carbon fibers within low-cycle fatigue regime at various displacement amplitudes and rates

Azadi

Alizadeh

Farrokhabadi

2021

Polymers and Polymer Composites

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In the present article, acoustic emission signals were utilized to predict the damage in polymer matrix composites, reinforced by carbon fibers, in the low-cycle fatigue regime. Displacement-controlled fatigue tests were performed on open-hole samples, under different conditions, at various displacement amplitudes of 5.5, 6.0, 6.5 and 7.0 mm and also under various displacement rates of 25, 50, 100 and 200 mm/min. After acquiring acoustic emission signals during cycles, two characteristic parameters were used, including the energy and the cumulative energy. Obtained results implied that the energy parameter of acoustic emission signals could be used only for the macroscopic damage, occurring at more than 65% of normalized fatigue cycles under different test conditions. However, the cumulative energy could properly predict both microscopic and macroscopic defects, at least two failure types, including matrix cracking at first cycles and the fiber breakage at last cycles. Besides, scanning electron microscopy images proved initially such claims under all loading conditions.

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Section: Resultsmentioning

confidence: 99%

“…Therefore, peaks occurred later with a higher amount. 45 Consequently, the cumulative energy could predict effective fatigue failures in composites, considering typical thresholds.…”

Section: Resultsmentioning

confidence: 99%

Cumulative acoustic emission energy for damage detection in composites reinforced by carbon fibers within low-cycle fatigue regime at various displacement amplitudes and rates

Azadi

Alizadeh

Farrokhabadi

2021

Polymers and Polymer Composites

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“…AE signals contain some features representative of the source in such a manner that direct correlation exists between the damage mechanisms and the AE parameters. Therefore, acoustic emission events can be classified using multivariable statistical analysis techniques and then attributed to a damage mechanism in the material [29][30][31]. In the present study, the AE monitoring was performed by using an acquisition system PCI-2 of Mistras Group Corporation.…”

Section: Acoustic Emissionmentioning

confidence: 99%

Influence of moisture and drying on fatigue damage mechanisms in a woven hemp/epoxy composite: Acoustic emission and micro-CT analysis

Barbiere

Touchard

Chocinski–Arnault

et al. 2020

International Journal of Fatigue

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For the last 20 years, plant fibres have emerged as an alternative to glass fibres in composites.However, a crucial issue with plant fibre composites is their durability, i.e. their long-term hygrothermal and fatigue performances. This study deals with the influence of different conditionings (Ambient, Wet and Wet/dry) on the fatigue behaviour of [(±45)] 7 hemp/epoxy composites. The induced damage mechanisms are investigated by acoustic emission and micro-CT. Results show that the Wet samples exhibit the lowest fatigue sensitivity despite their greatest damage quantity, whereas the Wet/dry specimens behave like pre-damaged Ambient ones.Micro-CT scans show that the same type of damage appears in all cases: cracks are made of a coalescence of partial debondings at hemp yarn/matrix interfaces, which can lead to macro-cracks crossing the sample thickness.Moreover it is demonstrated that, during fatigue tests, the evolution of cumulative AE energy and hysteresis loop energy, and the evolution of damage quantity measured by micro-CT and final hysteresis energy, are very similar whatever the conditioning.

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“…AE is defined as the generation and propagation of a transient elastic wave caused by a sudden release of strain energy which can be due to damage occurrence in the material [32][33][34]. The literature review revealed that this technique has been mainly used to consider the damage behavior of composite laminates under quasi-static loading [32,[35][36][37] while in just limited studies it has been used for the fatigue loading conditions [21,[38][39][40]. In the present study, Scanning Electron Microscope (SEM) images and AE technique have been used to investigate the effect of mode II fatigue crack growth rate, da/ dN, on the fatigue micro-damage features, i.e.…”

Section: Introductionmentioning

confidence: 99%

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

Mohammadi

Najafabadi

Saghafi

et al. 2021

Engineering Fracture Mechanics

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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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Investigation and identification of damage mechanisms of unidirectional carbon/flax hybrid composites using acoustic emission

Cited by 52 publications

References 44 publications

Cumulative acoustic emission energy for damage detection in composites reinforced by carbon fibers within low-cycle fatigue regime at various displacement amplitudes and rates

Cumulative acoustic emission energy for damage detection in composites reinforced by carbon fibers within low-cycle fatigue regime at various displacement amplitudes and rates

Influence of moisture and drying on fatigue damage mechanisms in a woven hemp/epoxy composite: Acoustic emission and micro-CT analysis

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

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