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Abstract

This article presents the measured thermal conductivity of tri-axial braided graphite/epoxy composites. An apparatus was designed for measuring the temperature at different locations with applied heat flux on a tri-axial braided composite sample. From the measured temperatures, the out-of-plane thermal conductivity, K_zz was calculated by using one-dimensional Fourier's law, while the in-plane thermal conductivities, K_xx and K_yy were obtained by using inverse FEM method through the ANSYS transient thermal analysis. Four different configurations of IM7/5250-4 graphite/epoxy composites of a single layer with tri-axial [0/±25°], [0/±35°], [0/±55°] and [0/±65°] braiding were used. Results indicate that K_zz has insignificant variations with respect to change of fiber orientation and temperature below 100°C. However, K_xx and K_yy strongly depend on the fiber orientation. The [0/±25°] composite sample has the highest value of K_xx, while the [0/±65°] composite sample shows the highest value for K_yy.

Keywords

composite material tri-axial braided thermal conductivity ANSYS fiber orientation.

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References

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Measurement of Thermal Conductivity of Triaxial Braided Composites

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