受跷跷板运动启发的超材料辅助材料

IF 1.5 4区 工程技术 Q3 MECHANICS
Teik-Cheng Lim
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引用次数: 0

摘要

受跷跷板运动的启发,我们利用相互连接的等腰三角形和直角三角形网络构建了一种机械超材料。这些连接被定义为具有旋转弹性约束的铰链,其中每个等腰三角形是三个相邻的旋转单元,而每个直角三角形则与四个相邻的旋转单元相连。利用几何方法确定了同轴加载下的有效泊松比,而同轴杨氏模量则是通过将刚性单元相对旋转时超材料铰链处的弹簧旋转能与均匀化连续体变形的应变能相匹配而得到的。结果表明,通过调整几何参数,泊松比可以从正值到负值不等。结果还显示,泊松比和杨氏模量的几何参数范围很宽,在机械性能较低时可进行微调;而在机械性能较高时,几何参数范围较窄,可进行粗调。这些观察结果表明,通过调整超材料的几何参数,它可以应用于从软机器人到结构应用等广泛领域。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Auxetic metamaterial inspired by the seesaw motion
A mechanical metamaterial has been constructed using a network of interconnected isosceles triangles and right triangles by inspiration from the seesaw motion. The connections are defined as hinges with rotationally elastic restraints wherein each isosceles triangle is three neighboring rotating units while each right triangle is connected to four neighboring rotating units. The effective Poisson's ratio under on-axes loading were established using geometrical approach while the on-axes Young's moduli were developed by matching the spring rotational energy at the hinges of the metamaterial during relative rotation of the rigid units with the strain energy of deformation of the homogenized continuum. Results reveal that by adjusting the geometrical parameters, the Poisson's ratio can range from positive to negative values. The results also show that both the Poisson's ratio and Young's moduli have a wide range of geometrical parameters for fine tuning at low mechanical properties and well as a narrow range of geometrical parameters for coarse tuning at high mechanical properties. These observations suggest that the metamaterial has a wide range of applications from soft robotics to structural applications by adjustment of its geometrical parameters.
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来源期刊
Journal of Mechanics
Journal of Mechanics 物理-力学
CiteScore
3.20
自引率
11.80%
发文量
20
审稿时长
6 months
期刊介绍: The objective of the Journal of Mechanics is to provide an international forum to foster exchange of ideas among mechanics communities in different parts of world. The Journal of Mechanics publishes original research in all fields of theoretical and applied mechanics. The Journal especially welcomes papers that are related to recent technological advances. The contributions, which may be analytical, experimental or numerical, should be of significance to the progress of mechanics. Papers which are merely illustrations of established principles and procedures will generally not be accepted. Reports that are of technical interest are published as short articles. Review articles are published only by invitation.
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