Metallic lattice structures have been widely utilized in different fields such as automobile, aerospace and so on, owing to their superior mechanical properties and energy absorption characteristics. In this paper, the enhanced dynamic mechanical properties of the modified rhombic dodecahedron (RD) lattice structures were investigated systematically through numerical simulation and theoretical analysis. Results indicated that compressive modulus, initial yield strength and normalized specific energy absorption (SEA) of the modified RD lattice structures all exhibited a quadratic growth trend with the increase of relative density beyond following the traditional law. Meanwhile, the plateau stress and normalized SEA exhibited certain sensitivity to the strain rate and almost linearly increased as the loading rate increased. Finally, a modified rigid-perfectly plastic-locking shock wave model was also proposed, and the predicted results of the proposed modified shock wave model were consistent with the simulation results.

金属晶格结构由于其优越的机械性能和能量吸收特性而被广泛应用于汽车，航空航天等不同领域。通过数值模拟和理论分析，系统地研究了改进的菱形十二面体（RD）晶格结构的动态力学性能。结果表明，改进的RD晶格结构的压缩模量，初始屈服强度和归一化比能吸收（SEA）均表现出二次增长趋势，相对密度的增加超出了传统规律。同时，平台应力和标准化的SEA对应变率表现出一定的敏感性，并且随着载荷率的增加而线性增加。最后，