A reasonable corrigendum on the previous article about the re-entrant and star-shape auxetic structures by theory and simulation

Auxetic structures are widely applied to absorb impact energy effectively. Changfang Zhao et al. proposed the auxetic structures of the concave hexagon and star shape. However, the analytical models of the auxetic structures were developed inaccurately, and some of their equations have been identified with mistakes. This paper is to correct the errors and verify the results calculated by the corrected equations with the results of finite element analysis simulation. In this paper, the Poisson's ratio and Young's modulus of two single-cell honeycomb and star structures and five nine-cell grid composite structures of the X-type, H-type, Sd-type, pure honeycomb, and star are calculated based on the Euler beam theory. Analytical models of the star and honeycomb structures have been corrected to calculate Young's modulus and Poisson's ratio.