Sandwich plate is utilized in an assortment of engineering enforcements such as
flying machine, building, and transport, which the solid, firm and light structures are
required. If the sandwich contains a functionally graded core, which can spread the
stresses that caused by bending or by the dynamic assimilation of energy that caused
by impact loading, and consequently, the materialness of sandwiches could be
enhanced. The current research is an attempt to numerically using finite element and
experimentally investigate of flexural and impact behaviour of functionally graded
rubber reinforced with different ratio of Wollastonite filler as core in sandwich
composite as well as epoxy resin reinforced with carbon fibers serves as a skin in
sandwich structure. Rubber core consists of five layers with weight fraction of
Wollastonite (0, 1, 2, 4 and 8) from the top to the base respectively, while the skins are
epoxy reinforced with carbon fibers unidirectional and chopped with (50%) volume
fraction. Tests performed include flexural resistance, impact resistance and rheological
properties for core. The results show good agreement between finite element analyses
and experimental, while the bending strength and impact strength for unidirectional
reinforcement skin shows higher value than chopped case, furthermore, it was found
that the strength values have increased significantly for the proposed structure
compared to the conventional sandwich structure while maintaining the weight of the
structure.