Novel auxetic structures with enhanced mechanical properties

Normally, enhancement of mechanical properties of auxetic cellular materials is at the expense of its negative Poisson's ratio. Here, two novel auxetic cellular structures are proposed, with the Young's modulus and yield strength of the auxetic structures significantly enhanced and without sacrifice of their negative Poisson's ratio in the corresponding perpendicular direction. Analytical solutions and finite element simulations are carried out to predict the mechanical properties of these new auxetic materials, and the results are validated by the experiments. In addition, the Young's moduli and strengths of the novel structures can be designed independently with the corresponding Poisson's ratios.