An extended thickness-dependent moisture absorption model for unidirectional carbon/epoxy composites
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 res...
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| Main Authors: | , , , , |
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| Format: | Article |
| Published: |
MDPI AG
2021
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| Subjects: | |
| Online Access: | http://eprints.utm.my/id/eprint/94923/ http://dx.doi.org/10.3390/polym13030440 |
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| Institution: | Universiti Teknologi Malaysia |
| Summary: | 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 f, non-Fickian diffusivity per square thickness a, 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 f and a 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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