目的 在不同冲击速度的共面载荷条件下， 获取多层 U 形 A 瓦楞结构材料动态力学性能参数。 方法 建立有限元分析模型， 并简化能量吸收模型， 来评估其能量吸收性能。 结果 随着冲击速度的不断增大， 均匀变形、过渡变形和动态变形等模式随之呈现。 结论 最佳单位体积的能量吸收主要由动态峰应力决定。 在结构参数一定的条件下， 共面动态峰应力取决于多层 U 形 A 瓦楞结构材料所受到的冲击速度。 通过对数值结果的物理分析和讨论， 提出了动态峰应力关于冲击速度的经验关系式。

Objective The finite element methodology was conceived to obtain the mechanical parameters about dynamic performance of multilayer A-type U-shaped corrugated structure materials under the in-plane crushing loadings with various impact velocities. Methods A simplified energy absorption model was proposed to evaluate the energy-absorption performance. Results The homogeneous deformation mode, transition deformation mode and dynamic deformation mode were gradually observed with the increasing impact velocities. Conclusion The evaluation model showed that the optimal energy absorption per unit volume was mainly determined by the dynamic plateau stress. The in-plane dynamic plateau stress depended on the impact velocity for the multilayer A-type U-shaped corrugated structure materials with given fixed configuration parameters. From the physical analysis and discussion of the numerical results, the empirical formula of dynamic plateau stress was suggested in terms of impact velocity.