Abstract
In a recent paper, the authors have pointed out that coefficients of thermal expansion (CTEs) of composites can be reduced by mixing microvoids in the matrix. In this paper, this principle was applied to 3D fabric composites (3DFCs). Three kinds of multiaxially reinforced 3DFC were formed into a porous (skeletonized) structure and the CTEs of these composites were measured. It was found that the CTEs of the composites were drastically reduced by introducing voids. Thus, by utilizing this technique, we can control the CTE of 3D composites in the range from the value of a usual 3D composite completely filled with the matrix, to nearly 0. These CTE values of skeletonized composites were shown to agreeareasonably well with the analytical predictions based on the Eshelby's equivalent inclusion method.
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