An Extended Thickness-Dependent Moisture Absorption Model for Unidirectional Carbon/Epoxy Composites

Abstract

Moisture absorption tests for materials that exhibit non-Fickian behavior generally require 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.

Research of cycloaliphatic epoxy resin and silicone rubber composite insulator interface based on four‐electrode system and temperature rise model

“…The test conditions are consistent with the artificial ageing test in section 2.2, the quality changes are recorded regularly, and the results are shown in Figure 4. Fick and Langmuir models describe the water diffusion process in the material [21, 22]. By fitting with Fick and Langmuir models, the saturated water absorption m ∞ and diffusion coefficient D of the sheath are obtained.…”

“…When it is difficult for water to 4. Fick and Langmuir models describe the water diffusion process in the material [21,22]. By fitting with Fick and Langmuir models, the saturated water absorption m ∞ and diffusion coefficient D of the sheath are obtained.…”

Lightweight Glass Fiber-Reinforced Polymer Composite for Automotive Bumper Applications: A Review

“…The prediction of damage behavior of lightweight GFRP composite under impact load is important for the design and development of GFRP composite for the automotive component. This is because impact events can cause significant damage in composite structures with different failure modes comprising fiber breakage, matrix cracking, multi-delamination, and catastrophic failures [ 195 , 196 ]. Knowledge of damage mechanics for the load-bearing performance of composite structures can be found elsewhere [ 197 , 198 ].…”