Abstract
This study investigates the flow velocity effect on the hygrothermal behavior of the polyester glass fiber composite. The composite material contains fillers additives aluminum silicate pigments (ASP 400). They are exposed to humidity under different temperatures. The humidity concentration is higher on the surface and it continuously decreases toward the core of the material. The increase of the fillers additives and the flow velocity induce an augmentation of the diffusion coefficient and the amount of absorbed humidity. At a high temperature, the absorption curve presents a fall, and it is due to the coalescence of the crack, which propagates inside the material, decreasing the rigidity of the material. The finite element method is used to simulate the humidity diffusion through composite material. The comparison between the experimental and numerical results shows that the model can predict the hygrothermal behavior of the polyester/glass fiber taking in account the flow velocity factor.
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