论文部分内容阅读
利用有限元软件ANSYS-LSDYNA研究了负泊松比蜂窝结构面内冲击动力学特性。在壁长和相对密度不变的前提下,建立了负泊松比蜂窝模型;通过改变胞元扩展角,讨论了冲击速度对蜂窝材料面内冲击变形模式和能量吸收能力的影响。数值研究发现,冲击载荷作用下负泊松比蜂窝结构的面内冲击性能更多依赖于冲击速度。提高冲击速度,冲击端的峰值应力、平台应力、试件的比吸能均增高;但在相同冲击速度下,冲击端和支撑端的峰值应力、平台应力、试件的比吸能均随胞元扩展角的增大而降低。
The in-plane impact dynamics of negative Poisson’s ratio honeycomb structure was studied by the finite element software ANSYS-LSDYNA. The negative Poisson’s ratio honeycomb model was established on the premise of constant wall length and relative density. The effect of impact velocity on in-plane impact deformation mode and energy absorption capacity of honeycomb materials was discussed by changing the cell expansion angle. Numerical studies show that the in-plane impact of negative Poisson’s ratio honeycomb structures under impact load depends more on the impact velocity. However, at the same impact velocity, the peak stress, the platform stress and the specific energy absorption of the specimen both increase with the cell expansion at the same impact velocity The angle increases and decreases.