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Design and characterisation of a tuneable 3D buckling-induced auxetic metamaterial
Materials & Design ( IF 8.4 ) Pub Date : 2018-02-01 , DOI: 10.1016/j.matdes.2017.11.025
Xin Ren , Jianhu Shen , Phuong Tran , Tuan D. Ngo , Yi Min Xie

Abstract Elastic instability has been increasingly used to design buckling-induced auxetic metamaterials. However, only limited patterns of existing three dimensional (3D) buckling-induced auxetic metamaterials exhibit a reliable 3D auxetic behaviour, i.e., the material will contract along two normal lateral directions under compression along the third direction. In this paper, we study a simple geometrical shape for achieving 3D auxetic behaviour. The unit cell of the proposed 3D design is composed of a solid sphere and three cuboids. Two representative models, one with slender connecting bars and the other with thick connecting bars, are investigated both numerically and experimentally. The results indicate that the designed material with thick connecting bars did not exhibit auxetic behaviour while the one with slender connecting bars did. However, the anticipated 3D auxetic behaviour degraded to a two dimensional (2D) auxetic behaviour, i.e., the material would contract only in one lateral direction and maintain nearly the same dimension in the other lateral direction. This finding was further confirmed by experiments. This research has demonstrated challenges in designing and manufacturing of buckling-induced auxetic metamaterials with 3D auxetic behaviour and highlighted the importance of optimising and fine-tuning the auxetic unit cell using the pattern scale factor.

中文翻译:

可调谐 3D 屈曲诱导拉胀超材料的设计和表征

摘要 弹性不稳定性越来越多地用于设计屈曲诱导拉胀超材料。然而,只有有限的现有三维 (3D) 屈曲诱导拉胀超材料模式表现出可靠的 3D 拉胀行为,即材料将在沿第三方向的压缩下沿两个法向横向收缩。在本文中,我们研究了一种用于实现 3D 拉胀行为的简单几何形状。所提出的 3D 设计的晶胞由一个实心球体和三个长方体组成。两种代表性模型,一种带有细长连接杆,另一种带有粗连接杆,通过数值和实验进行了研究。结果表明,具有粗连接杆的设计材料没有表现出拉胀行为,而具有细长连接杆的材料则表现出拉胀行为。然而,预期的 3D 拉胀行为退化为二维 (2D) 拉胀行为,即材料将仅在一个横向方向收缩而在另一个横向方向上保持几乎相同的尺寸。实验进一步证实了这一发现。这项研究证明了设计和制造具有 3D 拉胀行为的屈曲诱导拉胀超材料的挑战,并强调了使用图案比例因子优化和微调拉胀晶胞的重要性。
更新日期:2018-02-01
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