为研究五模点阵环状结构对于碰撞冲击应力波的调控效果，基于坐标变换理论和增材制造技术，设计制作了五模点阵环状结构试验模型，通过冲击试验及仿真发现，五模点阵环状结构内环迎冲面的应变峰值明显小于内环背冲面，应力在五模点阵环状结构中有明显分叉趋势，可以有效降低迎冲面的应力集中。相较于等质量实心圆环，五模点阵环状结构内环迎冲面应变峰值降低了53%，内环背冲面应变峰值升高了18%。计算并分析五模点阵胞元的频散曲面发现，频散曲面等值线法向量的方向分布可以准确反映材料中的能流方向，在此基础上研究了胞元结构对能流特性的影响。相关结论可为潜艇抗冲击防护提供一定参考。
In order to study the regulation effect of the pentamode lattice ring structure on the impact stress wave, based on coordinate transformation theory and additive manufacturing technology ,an experimental model of the pentamode lattice ring structure is designed and manufactured. Through the impact test and simulation, it is found that the peak strain of the pentamode lattice ring structure on the upstream surface is significantly smaller than that on the back surface. The stress has obvious bifurcation tendency in the pentamode lattice ring structure, which can effectively reduce the stress concentration on the upstream surface. Compared with the equal mass solid ring, the peak strain of the test model on the upstream surface is reduced by 53%, while the peak strain on the back surface is increased by 18%. It is found that the direction distribution of the normal vector of the isoline of the dispersion surface can accurately reflect the direction of the energy flow in the material. On this basis, the influence of cell structure on the energy flow characteristics is studied. The relevant conclusions can provide some reference for submarine resisting impact protection.
2023,45(19): 17-24 收稿日期：2022-09-01
DOI：10.3404/j.issn.1672-7649.2023.19.003
分类号：TB33
基金项目：国家自然科学基金面上项目（51879270）
作者简介：韩邦熠(1997-),男,硕士研究生,研究方向为舰艇结构抗爆抗冲击
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