Three-dimensional fabric sandwich composites (3D fabric composites) were prepared by impregnating epoxy resin in a hand lay-up procedure. Two types of the 3D fabric composites with the core height of 10mm and 20mm were selected to study the mechanical properties of 3D fabric composites, including flat compression, shear, and flexure properties. The results show that the flexure properties of the 3D fabric composites increased with the increase of core height, while the flat compression and shear properties decreased. Compared with the 3D fiber composites, the 3D fabric composites have much better flat compression and shear properties, although the flexure properties were similar. This work could provide a reference for the optimization of design and mechanical properties of the 3D fabric sandwich composites.
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