Based on the inspiration from micro biological structure in nature, a novel bio-inspired negative Poisson’s ratio (NPR) auxetic reentrant honeycomb (ARH) is designed, and the crashworthiness is studied numerically. Combining both graded structure of bamboo and concentric-cell structure of coconut palm, two types of unidirectionally and two types of bidirectionally graded concentric ARH are proposed. The present graded/concentric structure design not only induces the progressive structural crushing behaviors, but improves the specific energy-absorption capacity because of low equivalent wall-thickness. The plateau stress and energy-absorption characteristics of the bio-inspired ARH structure are studied in comparison with traditional ARH structure. Furthermore, the coupled crushing deformation modes, shrinkage deformation mechanism and NPR effect are systematically analyzed to reveal the structural enhancement mechanism. Results show that the predicted stress-strain responses and crushing deformation modes correlate well with the reference results. Relative to conventional ARH, the graded concentric ARH has higher plateau stress and specific energy-absorption. The gradient variations are presented for both plateau stress and crushing deformation modes. The gradient direction has a significant effect on the crushing deformation modes and deformation order of every layer, the bidirectionally graded concentric ARH has higher energy absorption capacity than the unidirectionally graded concentric ARH, and the shrinkage deformation is significantly affected by the number of concentric-cell.
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