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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 To obtain dynamic mechanical properties of multi-layered U-shaped corrugated Aramid materials under coplanar loading with different impact velocities. Methods The finite element analysis model was established, and the energy absorption model was simplified to evaluate the energy absorption performance. Results With the increasing impact velocity, uniform deformation, transitional deformation and dynamic deformation modes appear. Conclusion The energy absorption of the best unit volume is mainly determined by the dynamic peak stress. Under the condition of certain structural parameters, the dynamic stress of coplanar dynamic peak depends on the impact velocity of multi-layer U-shaped corrugated aramid material. Based on the physical analysis and discussion of the numerical results, the empirical relationship between the dynamic peak stress and the impact velocity is proposed.