2017年第5期崔世堂修改稿及-应用力学学报.PDF

负泊松比蜂窝面内动态压缩行为与吸能特性研究 崔世堂 王波 张科* 中国科学院材料力学行为和设计重点实验室 中国科学技术大学 合肥 230026 摘 要：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、平台应力和比吸能均增高；但在相同冲击速 度下，两端的峰值应力、平台应力和比吸能均随胞元扩展角的增大而降低。 关键词：蜂窝; 负泊松比; 面内冲击; 能量吸收 Mechanical behavior and energy absorption of honeycomb with Negative Poissons ratio under in-plane dynamic compression CUI Shitang, WANG Bo, ZHANG Ke CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei, 230026, Anhui, P. R. China Abstract: The in-plane dynamic mechanics behavior of honeycombs with negative Poissons effect were numerical studied by finite elements software ANSYS-LSDYNA. Assuming that the edge length and the relative density are all the same, the finite elements models of honeycomb with the negative Poissons effects were established. The influence of impact velocity on the in-plane crushing deformation and energy absorption with different cell expanding angle were discussed. Numerical studies have found that the dynamic properties of honeycomb under in-plane impact loading is more dependent on impact velocity. The peak stress and plateau stress at the impact end and the specific energy absorption increase with the increasing of impact velocity. And, the peak stress and plateau stress at both ends and the specific energy absorption decrease with the increasing of the cell expanding angle under the same impact velocity. Key words: honeycomb; negative Poissons effect; in-plane impacting; energy absorption 蜂窝作为一种典型的多孔材料，具有相 膨胀，伴随着这种独特的拉伸和膨胀现象, 对密度小、成本低、变形能力强、比刚度和 负泊松比蜂窝材料具有更高的冲击阻抗、抗