三角形蜂窝异面动态压缩仿真研究

Simulations of Out-of-plane Dynamic Compressions of Triangular Honeycomb Cores

中文关键词:  三角形蜂窝  有限元分析  异面  比吸能  动态峰应力

英文关键词:triangular honeycomb  finite element analysis  out-of-plane  specific energy absorption  dynamic plateau stress

中文摘要:

      目的 研究三角形蜂窝材料结构参数和压缩速度对其异面压缩性能的影响。方法 借助Ansys/LS-DYNA建立基于特征单元的三角形蜂窝异面动态压缩有限元分析模型，而后对三角形蜂窝在不同单元结构参数和压缩速度下进行异面压缩参数化仿真计算。结果 对于三角形蜂窝，当所有结构参数保持不变时，异面动态峰应力与压缩速度呈二次曲线关系。在给定压缩速度下，扩展角固定的三角形蜂窝的异面动态峰应力与壁厚度边长比呈幂函数关系；壁厚边长比固定的三角形蜂窝的异面动态峰应力与拓展角呈二次曲线关系。结论 当相对密度一致时，正三角形蜂窝比正六边形蜂窝异面比吸能值更大；异面动态峰应力与压缩速度、单元结构参数之间的相互关系，可用一定关系曲线进行拟合。

英文摘要:

      The work aims to study the influence of configuration parameters and compression velocity of triangular honeycomb on the out-of-plane compression performance. Ansys/LS-DYNA was employed to create the finite element model for dynamic out-of-plane compression of triangular honeycomb based on the representative cell and the simulations of triangular honeycomb cores with various cell configuration parameters under the out-of-plane compressions were carried out. For triangular honeycomb, when all configuration parameters were fixed, the out-of-plane dynamic plateau stress was related to the compression velocity by quadratic polynomial equation. For a given compression velocity, the dynamic out-of-plane plateau stress of triangular honeycomb with a fixed expanding angle was related to the ratio of cell wall thickness to edge length by a power law. Fot the triangular honeycomb with a fixed ratio of cell wall thickness to edge length, the out-of-plane dynamic plateau stress is related to the expanding angle by a quadratic relationship curve. With the same relative density, SEA of regular triangular honeycomb is larger than that of regular hexagonal honeycomb; and the correlations between out-of-plane dynamic plateau stress and compression velocity (or cell configuration parameters) can be well fitted by certain curves.