Abstract
In this study, thermal properties of plain-woven laminates are analyzed using a triple-scale homogenization method. For this, thermal strain of fibers and matrix materials is incorporated into the elastic-viscoplastic homogenization theory developed by our research group. This method enables us to analyze thermal properties in not only fiber bundles but also fibers and matrix materials in fiber bundles, as well as macroscopic thermal properties. This method is then applied to the thermal property analysis of plain-woven carbon fiber/epoxy laminates subjected to a macroscopic temperature change from 180 ℃ to 20 ℃. Two types of carbon fibers are considered in the analysis. It is shown that quite high thermal residual stress can occur in fiber bundles, fibers and a matrix. It is also shown that the present method can analyze the change of thermal residual stress in the laminates depending on the difference of fibers.
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