Lightweight auxetic reentrant honeycombs (ARH) with negative Poisson's ratio (NPR) are very promising for crashworthiness applications due to high specific-strength and energy-absorption (EA). To dig up the potential of ARH, a bio-inspired self-similar “concentric auxetic reentrant honeycomb (CARH)” is proposed to reinforce the EA. Finite element model is established and verified via available reference results for quasi-static-, low-, medium- and high-velocity compression. Two types of CARHs including CARH-I and CARH-II are designed to systematically explore the crashworthiness. The quasi-static and dynamic compression behaviors and EA characteristics are compared among different structures. There is a harvest that the bio-inspired CARHs show higher plateau stress and EA than the traditional ARH, while CARH-II > CARH-I. To clearly understand strengthening mechanisms, different global and unicellular shrinkage deformation modes (e.g., “x”, “X”, “I”, “V”, etc.) are revealed under different velocities. Summarily, the enhancement is due to coupling deformation and energy-dissipation of more plastic-hinges. The horizontal strain of each layer is studied to reveal the NPR effect, which shows a significant velocity effect on the horizontal strain. From parametric studies, typical parameters (e.g. wall-thickness, distance and number of concentric walls) have considerable effects on crashworthiness of CARH. The present bio-inspired design and findings offer a reference for the development of honeycomb with special functions.

负泊松比（NPR）为负的轻质膨胀回折蜂窝（ARH）由于具有较高的比强度和能量吸收（EA）而非常适合用于耐撞性应用。为了挖掘ARH的潜力，提出了一种以生物为灵感的自相似“同心生长折返蜂窝（CARH）”以增强EA。建立了有限元模型，并通过可用的参考结果对准静态，低速，中速和高速压缩进行了验证。设计了两种类型的CARH，包括CARH-I和CARH-II，以系统地研究耐撞性。比较了不同结构之间的准静态和动态压缩行为以及EA特性。有收获表明，受生物启发的CARH比传统ARH表现出更高的高原应激和EA，而CARH-II> CARH-I。x ”，“ X ”，“ I ”，“ V ”等）以不同的速度显示。总体而言，增强是由于更多的塑料铰链的耦合变形和能量耗散。研究了每层的水平应变，以揭示NPR效应，这显示出对水平应变的显着速度效应。根据参数研究，典型参数（例如，壁厚，距离和同心壁数）对CARH的耐撞性有很大影响。目前的生物启发设计和发现为具有特殊功能的蜂窝的发展提供了参考。