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首页> 外文期刊>Journal of Materials Science >Mechanical behaviors of hierarchical cellular structures with negative Poisson's ratio
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Mechanical behaviors of hierarchical cellular structures with negative Poisson's ratio

机译：负泊松比例的分层蜂窝结构的机械行为

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摘要

An investigation of the mechanical behaviors on hierarchical re-entrant honeycomb structures was undertaken using finite element method. The hierarchical structure with a hierarchy order n (n = 1) was constructed by replacing each vertex of a re-entrant hexagonal structure of hierarchy order n - 1 with a smaller re-entrant hexagon with identical geometry aspect ratio. The Poisson's ratio and energy absorption capacity of re-entrant structures of different hierarchy orders were studied under various compression velocities. The minimum Poisson's ratios of the first-order (n = 1) and second-order (n = 2) hierarchical re-entrant structures were - 1.581 and - 1.823, respectively; they were 32.9 and 53.2% lower than that of a zeroth-order hierarchical structure (i.e., conventional re-entrant hexagon). The second-order hierarchical structure exhibited the highest rate of increase in energy absorption capacity with an increasing compression velocity. The plateau stresses of the first- and second-order hierarchical structures were lower than that of the zeroth-order hierarchical structure; however, the second-order hierarchical structure exhibited the highest energy absorption capacity at high compression velocity rate (v 40 m/s). The energy absorption capacities of the first- and second-order hierarchical structures proposed in the present study are 1.5 and 1.8 times, respectively, higher than those of the hierarchical re-entrant structures proposed in our previous work (Li et al. in Smart Mater Struct 26:025014, 2017).
机译：采用有限元法进行了分层再参与者蜂窝结构的机械行为的研究。通过用具有相同几何纵横比的较小的再参与者六边形的再参赛者六边形结构的每个顶点来构造具有层次阶N（n＆ = 1）的层次结构。在各种压缩速度下研究了不同层次订单的再参与者结构的泊松比和能量吸收能力。一阶（n = 1）和二阶（n = 2）分层再参与者结构的最低泊松比分别为-1.581和-1.823;它们的32.9％和53.2％低于零阶等级结构（即，传统的再参赛者六边形）。二阶分层结构具有增加的压缩速度的能量吸收能力的最高速率。第一阶和二阶层结构的高原应力低于零阶等级结构的强调;然而，二阶分层结构以高压缩速度率（V＆ 40 m / s）表现出最高的能量吸收能力。在本研究中提出的第一级和第二级分层结构的能量吸收能力分别为1.5和1.8倍，分别比那些层次折返结构在我们以前的工作提出了更高的（Li等智能母校结构26：025014,2017）。

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  • 来源
    《Journal of Materials Science》 |2018年第14期|共8页
  • 作者

    Hou Jiahong; Li Dong; Dong Liang;

  • 作者单位

    Northeastern Univ Coll Sci Shenyang 110819 Liaoning Peoples R China;

    Northeastern Univ Coll Sci Shenyang 110819 Liaoning Peoples R China;

    Univ Virginia Mat Sci &

    Engn Charlottesville VA 22904 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
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