目的 在不同速度的共面冲击载荷条件下，获取不同壁厚边长比的斜方形蜂窝芯材的动态性能力学参数。方法 建立有限元分析模型以及简化的能量吸收模型，以评估斜方形蜂窝芯材共面方向上的力学性能。结果 在冲击速度从低到高逐渐增大的过程中，局部坍塌、"V"字形过渡和“一”字形坍塌等变形模式先后出现，对其进行了详细的描述和展示。结论 在不同壁厚边长比下，当其余结构参数固定时，动态峰应力与冲击速度的平方成线性关系；在不同冲击速度下，其余参数固定时，动态峰应力与壁厚边长比成幂指数关系。通过对数值结果的物理分析和讨论，提出了关于冲击速度与动态峰应力的关系的经验公式。

The work aims to obtain the mechanical parameters about the dynamic impact performance of rhombic honeycomb cores with various cell-wall-thickness-to-edge-length (δ/l) ratios, under the in-plane impact loadings with different impact velocities. The finite element analytical model and the simplified energy absorption model were established to evaluate the in-plane mechanical performance of rhombic honeycomb cores. The local collapse mode, V-shaped transitional mode and I-shaped deformation mode were gradually observed with the increasing impact velocities. These three different deformation modes were described and presented in detail. Under various cell-wall-thickness-to-edge-length ratios, when the remaining structural parameters are fixed, the dynamic plateau stress is in linear relation with the square of the impact velocities. At different impact velocities, when the remaining parameters are fixed, the dynamic plateau stress is related to theδ/l ratios with the exponential relationship. Through the physical analysis and discussion of the numerical results, the empirical formula on the relation between the impact velocity and the dynamic plateau stress is proposed.