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Carbon Fiber Reinforced Polymer (CFRP) composites are widely used in aircraft structures, because of their superior mechanical and lightweight properties. CFRP composites are often exposed to hygrothermal environments in service. Temperature and moisture can affect the material properties of composites. In order to make clear the moisture diffusion behavior and the properties degradation of composites, the TG800/E207 composite laminates with four stacking sequences 016, 9016, ±454s, and (+45/0/0/–45)ss are designed and manufactured. Moisture absorption tests are carried out at 80 ℃, 90 %RH. It is shown that the moisture absorption curves of composite laminates present a three-stage. A modified Fickian model was proposed to capture the diffusion behavior of TG800/E207 composite laminates. The relationships among the non-Fickian parameters, the environmental parameters and the stacking sequences of CFRP were correlated and compared. Results showed that the modified Fickian curve is sensitive to the diffusivity of Stage I and Stage II. Compared with unaged specimens, the maximum tensile stress for 016, 9016, ±454s, and (+45/0/0/–45)ss decreased by 14.94 %, 28.15 %, 11.96 %, and 26.36 %, respectively. The strains at failure for 016, 9016, ±454s, and (+45/0/0/–45)ss decreased by 55.38 %, 62.65 %, 46.41 %, and 31.71 %, respectively. The elastic modulus for 016, 9016, ±454s, and (+45/0/0/–45)ss increased by 90.93 %, 94.57 %, 49.22 %, and 8.22 %, respectively. 9016 sample has the minimum saturated moisture content and the maximum strength degeneration.
Du et al. (Fri,) studied this question.