Abstract Polycrystalline-like (PL) lattice structures are potential energy-absorbing structures composed of basic periodic mono-crystals arranged in different orientations. A series of numerical simulations were conducted to investigate the in-plane crushing resistance and energy absorption of different polycrystalline-like lattice structures. The finite element modelling (FEM) results clearly reveal that the PL lattice structures provides more excellent impact resistance and energy absorbing efficiency compared with conventional monocrystalline (MC) lattices. Compared with the four-cell ML lattice structure, the nine-cell PL lattice structures improve the mean crushing force (MCF) and specific energy absorption (SEA) by 1.5 times, and can effectively suppress the growth rate of the initial peak force (PF). The improvements in the MCF and the SEA originate from the grain boundaries of the PL lattice structures which restrain the evolution of the shear bands and change the shear failure mode of the MC lattice structures into a layer-by-layer progressive crushing mode.

中文翻译：

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类多晶晶格结构的塑性变形和能量吸收

摘要 类多晶（PL）晶格结构是由基本周期性单晶排列成不同取向的势能吸收结构。进行了一系列数值模拟以研究不同多晶状晶格结构的面内抗压性和能量吸收。有限元建模 (FEM) 结果清楚地表明，与传统的单晶 (MC) 晶格相比，PL 晶格结构提供了更出色的抗冲击性和能量吸收效率。与四单元 ML 晶格结构相比，九单元 PL 晶格结构将平均压碎力 (MCF) 和比能量吸收 (SEA) 提高了 1.5 倍，并能有效抑制初始峰值力 (PF) 的增长速度。 ）。