负泊松比多胞材料的面内动态冲击仿真研究

In-plane Dynamic Impact Simulation of Cellular Materials with Negative Poisson's Ratio

多胞材料常作为高精密机械设备的运输包装材料,防止运输颠簸带来的损坏。以内凹三角形负泊松比多胞结构为研究对象,通过显式动力有限元软件LS-DYNA建立了不同内凹形式下的轴向冲击有限元模型,并进行了模型验证。研究不同内凹形式对平台应力与比吸能值的影响。结果表明,内凹形式对多胞结构的力学性能具有较大影响,其中,单边内凹的结构形式具有较大的平台应力值,上下对称式的结构形式具有长而稳的平台区,通过对内凹形式的合理设计,可以应用于更多的使用工况。

Cellular materials were often used as transport packaging materials for high-precision mechanical equipment to prevent damage caused by transport turbulence.The concave triangle structure with negative Poisson’s ratio(NPR)was taken as the research object.Based on explicit dynamic finite element software LS-DYNA,the finite element model of axial impact with different concave forms were established,and the model were verified.The influence of different concave forms on the platform stress and the specific energy was studied.Results show that the concave form has a great influence on the mechanical properties of the multi-cell structure.The single-side concave structure has a large platform stress,and the upper and lower symmetrical structure has a long and stable platform area.By designing the reasonable concave form,it can be applied to more working conditions.