An investigation of the damage mechanisms and fatigue life diagrams of flax fiber-reinforced polymer laminates

Abstract : In this paper we investigated the fatigue damage of a unidirectional flax-reinforced epoxy composite using infrared (IR) thermography. Two configurations of flax/epoxy composites layup were studied namely, [0]16 unidirectional ply orientation and [\textpm45]16. The high cycle fatigue strength was determined using a thermographic criterion developed in a previous study. The fatigue limit obtained by the thermographic criterion was confirmed by the results obtained through conventional experimental methods (i.e., Stress level versus Number of cycles to failure). Furthermore, a model for predicting the fatigue life using the IR thermography was evaluated. The model was found to have a good predictive value for the fatigue life. In order to investigate the mechanism of damage initiation in flax/epoxy composites and the damage evolution, during each fatigue test we monitored the crack propagation for a stress level and at different damage stages, a direct correlation between the percentage of cracks and the mean strain was observed.
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Submitted on : Wednesday, December 12, 2018 - 11:44:48 AM
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  • HAL Id : hal-01952558, version 1

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Ihab El Sawi, Zouheir Fawaz, Redouane Zitoune, Habiba Bougherara. An investigation of the damage mechanisms and fatigue life diagrams of flax fiber-reinforced polymer laminates. Journal of Materials Science, 2014, 49 (5), pp.2338--2346. ⟨hal-01952558⟩

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