The in-plane impact and crushing properties have been studied for the Semi Reentrant structure (SRS) by using numerical simulations and theoretical studies. Different deformation modes during impact process could be observed under the various impact velocities, and there were three and two deformation modes in x₁ and x₂ directions, respectively, no matter for single or double sidewall conditions. The influence of arm length l and cell wall thickness t on the critical impact velocities of different deformation modes was investigated. With the increase of cell wall thickness, the critical velocity in both directions increased and power-law relations could be established. With the increase of inclined arms length l, the critical velocity in x₁ direction was almost the constant while that in x₂ direction generally decreased and was described by the power-law relationship. The influence of impact velocity on the dynamic elastic moduli was studied and the fitting curves between the normalized velocity and moduli were characterized by using piecewise functions. Moreover, the effect of impact velocity on the plateau stress, densification strain and densification strain energy were also analyzed, and related fitting expressions were obtained. Besides, theoretical models for predicting static and dynamic plateau stress and densification strain energy for SRS were established based on the previous study. The analytical model of dynamic plateau stress was then revised according to the fitting equations with a large enhancement of predicting accuracy.

通过使用数值模拟和理论研究，研究了半重入结构 (SRS) 的面内冲击和压碎性能。在不同的冲击速度下，在冲击过程中可以观察到不同的变形模式，无论是单侧壁还是双侧壁条件，x ₁和x ₂方向分别有3种和2种变形模式。研究了臂长l和单元壁厚t对不同变形模式临界冲击速度的影响。随着细胞壁厚度的增加，两个方向的临界速度都增加，可以建立幂律关系。随着斜臂长度l的增加，x ₁方向的临界速度几乎是常数，而x ₂方向的临界速度方向普遍下降，并由幂律关系描述。研究了冲击速度对动弹性模量的影响，并利用分段函数表征了归一化速度与模量之间的拟合曲线。此外，还分析了冲击速度对平台应力、致密化应变和致密化应变能的影响，并得到了相关的拟合表达式。此外，在前人研究的基础上，建立了预测SRS静态和动态平台应力和致密化应变能的理论模型。根据拟合方程对动态平台应力分析模型进行修正，预测精度大大提高。