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 Effects of moist environment on the development of internal stress the composite sandwich panels
Tác giả hoặc Nhóm tác giả: Luan TranVan, Dong NguyenVan
Nơi đăng: The 2nd International Conference on Green Technology and Sustainable Development 2014 (GTSD’14); Số: 2;Từ->đến trang: 20-25;Năm: 2014
Lĩnh vực: Kỹ thuật; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
One of the ways to optimize the spending energy in the naval structures is to decrease their weight. Thus, sandwich plates, consisting of a core covered by face sheets, are frequently used instead of solid plates because of their high bending stiffness-to-weight ratio. The mechanical properties of these materials can be significantly reduced by presence of moisture inside them when they are exposed to a wet environment during long time service. In order to study the effects of moisture absorption on mechanical properties of these materials, moisture absorption characteristic was investigated for specimens of balsa core and sandwich structure composed of E-glass/polyester face sheets bonded to a balsa core. These specimens were immersed in distilled water at 40°C, and the weight gain was measured. The diffusive behavior experimentally observed to identify the parameters controlling the diffusion process such as the diffusion coefficients and the water content at saturation. A new analytical solution for the effective diffusivities was proposed by solving the homogeneous problem. A hygroscopic finite element model has been built and was used to simulate the moisture diffusion in composite sandwich plate. As expected, the theory and experiments are agreed well. The obtained results allow predict a multi-layer internal appearance stresses to comprehend the geometrical stability of the sandwich.
ABSTRACT
One of the ways to optimize the spending energy in the naval structures is to decrease their weight. Thus, sandwich plates, consisting of a core covered by face sheets, are frequently used instead of solid plates because of their high bending stiffness-to-weight ratio. The mechanical properties of these materials can be significantly reduced by presence of moisture inside them when they are exposed to a wet environment during long time service. In order to study the effects of moisture absorption on mechanical properties of these materials, moisture absorption characteristic was investigated for specimens of balsa core and sandwich structure composed of E-glass/polyester face sheets bonded to a balsa core. These specimens were immersed in distilled water at 40°C, and the weight gain was measured. The diffusive behavior experimentally observed to identify the parameters controlling the diffusion process such as the diffusion coefficients and the water content at saturation. A new analytical solution for the effective diffusivities was proposed by solving the homogeneous problem. A hygroscopic finite element model has been built and was used to simulate the moisture diffusion in composite sandwich plate. As expected, the theory and experiments are agreed well. The obtained results allow predict a multi-layer internal appearance stresses to comprehend the geometrical stability of the sandwich.
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