Novel 2D star-shaped honeycombs with enhanced effective Young’s modulus and negative Poisson’s ratio

In the present paper, three kinds of novel two-dimensional enhanced star-shaped honeycombs (2D-ESSH) are proposed, which are consisted of the two-dimensional star-shaped honeycomb (2D-SSH) and reinforcing rods. Relative densities of the 2D-SSH and three kinds of 2D-ESSH are deduced. Mechanical properties of the proposed novel 2D-ESSH are investigated via finite-element simulations and compression experiments. The effects of the effective length, the angle of the outer cell walls, the thickness of the outer cell walls, the angle of the inner cell walls, and the thickness of the inner cell walls on the effective Poisson’s ratio and effective Young’s modulus of the structures are explored in detail. The results show that the novel 2D-ESSH can effectively regulate the effect of negative Poisson’s ratio and two kinds of the 2D-ESSH also improve the effective Young’s modulus with the appropriate parameters while ensuring the lightweight.