An extended thickness-dependent moisture absorption model for unidirectional carbon/epoxy composites

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Abstract

Moisture absorption tests for materials that exhibit non-Fickian behavior generally re-quire a relatively long period to reach saturation. Therefore, it would be beneficial to establish a relationship between the moisture content and the thickness to minimize the experimental time and cost. This research characterizes the moisture absorption behavior of AS4/8552 carbon/epoxy composites. Specimens were prepared at 4, 8, and 16 plies and immersed in distilled water at 60◦C. The relationship between the non-Fickian parameters (Fickian to non-Fickian maximum moisture content ratio φ, non-Fickian diffusivity per square thickness α, and non-Fickian initiation time to ) and thickness was characterized using a thickness-dependent model. A comparison with other materials revealed that all three non-Fickian parameters are able to be fitted using a power law. Nevertheless, the upper boundary for the applicability of this model was not determined in this study. The Weibull distribution plots indicate that the probability of non-Fickian moisture absorption is influenced by φ and α at approximately 62% within a normalized thickness range of 2–3. In regards to to, it is 82% at a normalized thickness of 6. Therefore, the Weibull distribution is proposed for the assessment of non-Fickian moisture absorption based on the material’s thickness.

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Azizan, A., Johar, M., Karam Singh, S. S., Abdullah, S., Koloor, S. S. R., Petrů, M., … Tamin, M. N. (2021). An extended thickness-dependent moisture absorption model for unidirectional carbon/epoxy composites. Polymers, 13(3), 1–13. https://doi.org/10.3390/polym13030440

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