工字梁型蜂窝芯材共面冲击性能的有限元模拟

Finite Element Simulation of In-Plane Impact Properties for I-beam Honeycomb Cores

目的研究双壁厚工字梁型金属蜂窝芯材的共面冲击性能。方法借助有限元软件Ansys/LSDYNA,建立工字梁型蜂窝芯材的有限元模型,并进行CAE分析。结果在不同冲击速度下,工字梁型蜂窝芯材表现出不同的变形模式。当工字梁型金属蜂窝芯材的其他结构参数固定时,其共面动态峰应力与冲击速度的平方成线性关系;当冲击速度一定时,其共面动态峰应力与壁厚边长比成幂指数关系。同时,拟合得到了工字梁型金属蜂窝芯材共面动态峰应力关于壁厚边长比和冲击速度的经验计算公式。结论工字梁型蜂窝具有优良的结构和吸能能力,研究工字梁型蜂窝的冲击性能具有重要的科学研究和工程应用价值。

The work aims to study the in-plane impact properties of double-walled metal I-beam honeycomb cores. The finite element model of I-beam honeycomb cores was established by means of finite element software Ansys/LS-DYNA and the CAE analysis was carried out. The different deformation modes were expressed by the I-beam honeycomb cores at different impact velocities. When other structural parameters of metal I-beam honeycomb cores were kept constant, the in-plane dynamic peak stresses were linearly proportional to the square of impact velocities. When the impact velocities remained constant, its in-plane dynamic peak stress was in exponential relation with the ratio of wall thickness to side length. In the meantime, the empirical calculating formula with respect to the ratio of wall thickness to side length and impact velocities of the in-plane dynamic peak stress of the metal I-beam honeycomb cores was obtained by fitting. The I-beam honeycombs have excellent structure and energy absorption ability. The study on the impact performance of I-beam honeycombs has important value of scientific research and engineering application.