Novel energy-absorbing structures were a crucial requirement for the structural crashworthiness design in the automotive and aerospace industries. Inspired by the unique double-diagonal reinforced configuration of deep-sea glass sponge, we proposed a bionic lattice structure (BLS) fabricated by additive manufacturing (AM). In-plane quasi-static compression tests and numerical simulations were conducted on BLS with varying wall thicknesses (), and two distinct deformation modes were observed: layer-by-layer mode with zero Poisson's ratio (ZPR) and uniform deformation mode with negative Poisson's ratio (NPR). The effects of structural parameters on the crushing behavior of BLS were investigated by numerical method. It was found that BLS with wall thickness () of 1.2 mm exhibited better energy absorption performance than 0.45 mm, with the energy absorption (), specific energy absorption (), and mean crushing force () increased by 745.0%, 216.5%, and 744.3%, respectively. The change in crushing mode was caused by the ‘+’ shaped joints changing from buckling to rotation, and the crushing behaviors of BLS could be effectively controlled by adjusting unit size and unit number. Finally, theoretical prediction models were developed using simplified super folding element (SSFE) theory to gain deeper insights into crushing behavior and performance of BLS. The present study provided valuable insights into the in-plane crushing and energy absorption capabilities of BLS. Moreover, it highlighted the potential of the double-diagonal reinforcement design in developing innovative energy-absorbing structures.

中文翻译：

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海绵晶格结构的面内破碎行为和能量吸收


新型能量吸收结构是汽车和航空航天行业结构耐撞设计的关键要求。受深海玻璃海绵独特的双对角强化结构的启发，我们提出了一种通过增材制造（AM）制造的仿生晶格结构（BLS）。对不同壁厚的BLS进行面内准静态压缩试验和数值模拟，观察到两种不同的变形模式：零泊松比（ZPR）的逐层模式和负泊松比的均匀变形模式比率（NPR）。采用数值方法研究了结构参数对BLS破碎行为的影响。结果发现，壁厚()为1.2 mm的BLS比0.45 mm的BLS表现出更好的能量吸收性能，能量吸收()、比能量吸收()和平均破碎力()分别提高了745.0%、216.5%和分别为 744.3%。破碎方式的变化是由“+”形关节从屈曲变为旋转引起的，通过调整单元尺寸和单元数量可以有效控制BLS的破碎行为。最后，利用简化超级折叠单元 (SSFE) 理论开发了理论预测模型，以更深入地了解 BLS 的破碎行为和性能。本研究为 BLS 的面内破碎和能量吸收能力提供了宝贵的见解。此外，它还强调了双对角加固设计在开发创新吸能结构方面的潜力。