Crashworthiness analysis of double-arrowed auxetic structure under axial impact loading

Structures with negative Poisson's ratios have been widely applied in existing engineering, especially in the field of energy absorption. To design double-arrowed auxetic structures to better absorb energy, it is essential to conduct parametric analysis on their crashworthiness. In this paper, the effect of the geometric parameters on the crashworthiness performance is analyzed thoroughly on both macro-and micro-sized scales. At the macro scale, the effect of the slenderness ratio and size of the unit cell are analyzed. Additionally, the critical slenderness ratio is derived to distinguish the deformation modes under axial impact loading. At the micro scale, analysis of the effect of the angles and thickness of beams on the crashworthiness performance is conducted. It is found that the crashworthiness performance of double-arrowed auxetic structure is more sensitive to the parameters of the long-inclined beam than those of the short one. The discussion in this paper can help engineers to better design and optimize the double-arrowed crash box. (C) 2018 Elsevier Ltd.