材料科学
超材料
弯曲
辅助
压力(语言学)
吸收(声学)
机械能
棒
泊松分布
泊松比
航程(航空)
压缩(物理)
复合材料
机械
光电子学
物理
数学
病理
哲学
统计
功率(物理)
医学
量子力学
语言学
替代医学
作者
Xiang Xu,Chuanqiang Huang,Chongchong Li,Xiaogang Wang,Xiaojie Li,Zongjin Li,Xiangchao Feng,Bingyang Li,Yong Zhang,Haibo Ji,Pengfei Wang
出处
期刊:Small
[Wiley]
日期:2024-07-14
被引量:1
标识
DOI:10.1002/smll.202403082
摘要
Abstract Mechanical metamaterials with multi‐level dynamic crushing effects (MM‐MLs) are designed in this study through coordinate transformation and mirror arrays. The mechanical effects of the diameter and length ratio of the struts and connecting rods, the Euler angles, and the cell numbers on the mechanical properties are investigated separately. MM‐ML can exhibit significant two‐level platform stress, and the local cells in the first platform stress stage undergo rotational motion, while the second platform stress stage mainly involves collapse compression and bending. Although increasing the length of the connecting rods can increase the range of Poisson's ratio, it will reduce the level of platform stress and energy absorption. Increasing the Euler angle will reduce the strain interval of the first platform stress and can improve the energy absorption capacity. In addition, increasing the cell number while maintaining a constant relative density can effectively enhance energy absorption. MM‐ML has significant parameter controllability, can achieve different platform stress regions, different ranges of Poisson's ratios, and energy absorption requirements according to the application scenario, and can demonstrate functional diversity compared to existing research. The design scheme can provide ideas for adaptive crushing protection requirements.
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