刚度
超材料
隔振
结构工程
振动
有限元法
材料科学
屈曲
振动控制
流离失所(心理学)
声学
工程类
物理
光电子学
心理学
心理治疗师
作者
Ali Zolfagharian,Mahdi Bodaghi,Ramin Hamzehei,Liam Parr,Mohammad Fard,Bernard Rolfe
出处
期刊:Sustainability
[MDPI AG]
日期:2022-06-02
卷期号:14 (11): 6831-6831
被引量:56
摘要
Vibration isolation performance at low-frequency ranges before resonance is a vital characteristic that conventional springs cannot exhibit. This paper introduces a novel zero Poisson’s ratio graded cylindrical metamaterial to fulfill two main goals: (1) vibration isolation performance in low-frequency bands prior to resonance and (2) global buckling control of a long cylindrical tube. For this purpose, “soft and stiff” re-entrant unit cells with varying stiffness were developed. The cylindrical metamaterials were then fabricated using a multi-jet fusion HP three-dimensional (3D) printer. The finite element analyses (FEA) and experimental results demonstrate that the simultaneous existence of multi-stiffness unit cells leads to quasi-zero stiffness (QZS) regions in the force-displacement relationship of a cylindrical metamaterial under compression. They possess significant vibration isolation performance at frequency ranges between 10 and 30 Hz. The proposed multi-stiffness re-entrant unit cells also offer global buckling control of long cylindrical tubes (with a length to diameter ratio of 3.7). The simultaneous existence of multi-stiffness re-entrant unit cells provides a feature for designers to adjust and control the deformation patterns and unit cells’ densification throughout cylindrical tubes.
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