目的 研究冲击速度和结构参数对规则排列圆形蜂窝共面对角线方向缓冲性能的影响规律。方法 使用有限元分析软件ANSYS/LS−DYNA建立规则排列圆形蜂窝共面对角线方向动态冲击有限元模型，基于此模型进行参数化仿真模拟，得到不同冲击速度和结构参数下规则排列圆形蜂窝共面对角线方向的变形模式、密实化应变、平台应力和能量吸收特征，并以图表的形式呈现。结果 在共面对角线方向的不同冲击速度下，规则排列圆形蜂窝表现出不同的变形模式。密实化应变在低速和高速冲击下，只与壁厚半径比有关;在中速冲击下，密实化应变同时受冲击速度和壁厚半径比的影响。在给定壁厚半径比下，共面平台应力(或最佳单位体积能量吸收)与冲击速度的平方呈线性关系;在给定冲击速度下，共面平台应力(或最佳单位体积能量吸收)与壁厚半径比呈幂指函数关系。结论 并基于有限元计算结果，得到了动态密实化应变、平台应力和单位体积能量吸收的经验表达式。

The work aims to study the influences of impact velocity and configuration parameters on the in-plane cushioning properties of regularly-arranged circular honeycombs in the diagonal line. The finite element model of regularly-arranged circular honeycombs in the diagonal line was established with the software ANSYS/LS-DYNA. Based on this finite element model, the parametric simulations of the honeycombs with various configuration parameters and impact velocities were carried out. At different impact velocities in the diagonal line, the deformation modes, densification strains, plateau stresses and energy absorption properties were obtained and presented in tables and figures for the regularly-arranged circular honeycombs with different configuration parameters. At different impact velocities, the regularly-arranged circular honeycombs had different deformation modes in the diagonal line. At low or high impact velocities, the densification strain was only related to the ratio of cell wall thickness to radius, but was affected by both the impact velocities and the ratio of cell wall thickness to radius at moderate impact velocities. For a given ratio of cell wall thickness to radius, the in-plane plateau stress (or optimal energy absorption per unit volume) was linear with the square of impact velocity; at a given impact velocity, the in-plane plateau stress (or optimal energy absorption per unit volume) lied on the ratio of cell wall thickness to radius by a power exponential function. Based on the finite element results, the empirical formulas of densification strain, plateau stress, energy absorption per unit volume are derived.