Mechanical Properties and Failure Analysis of Lattice Grid Sandwich Structure

In this study, quare, kagome and triangular grid sandwich structures about carbon fibre reinforced epoxy (CF/EP) composite, were designed and manufactured. Mechanical properties of these designed sandwich structures were performed by three-point bending and finite element analysis (FEA). The bending stiffness and core shear stress were calculated and then compared. Results obtained indicate that stress concentration was found at loading regions that cracks occurred on the interface. The face yielding and core shear failure also play a key role in the sandwich grid structure. The results show that the carbon fibre fabricated triangular grid core has a much stiffer and stronger character than other structures.