Numerical and Experimental Studies of a Light-Weight Auxetic Cellular Vibration Isolation Base

Abstract

This paper presents a preliminary study of the dynamic performance of a novel light-weight auxetic (negative Poisson’s ratio) cellular vibration isolation base constituted by reentrant hexagonal honeycombs. Numerical and experimental analyses were conducted to reveal the effects of Poisson’s ratio (cell angle) and relative density (cell thickness) of these reentrant honeycombs on the dynamic performance of this novel base and to propose design guidelines for the best use of the auxetic cellular vibration isolation system. By doing numerical analysis, we found that, by decreasing the relative density of reentrant honeycombs and increasing Poisson’s ratio of them, excellent vibration isolation performance of the auxetic cellular base will be achieved. This analysis was followed by static, modal, and frequency response tests, which verified the results of the numerical analysis.

Mechanical Properties of Auxetic Cellular Material Consisting of Re-Entrant Hexagonal Honeycombs

“…Owing to their lower price, easy availability, and desirable mechanical properties, auxetic materials find a broad range of applications in many industrial sectors, especially in automotive, aerospace, and marine industries [ 16 , 17 ]. More and more auxetic materials and structures with different microstructures are used to replace the conventional counterparts and have achieved satisfactory results [ 18 ]. For example, in the aeronautic industry, the replacement of foam cores in sandwich structures with auxetic foams results in a significant decrease in the level of noise that reaches the inside of the cabin, since the acoustic absorption properties of auxetics have been shown to be superior to those of conventional materials [ 19 ].…”

Evaluation of the dynamic response of structures using auxetic-type base isolation

“…Similar results, indicating the capability of auxetics to reduce the propagation of imposed vibration, are presented in [6,17]. T Due to these advanced properties, the development of auxetic materials has been incorporated in various fields such as the automobile and aerospace industries, the medical field, the defence industry (particularly in high-performance body armour) and in sports equipment [10,18]. More research on auxetic structures' performance under vibration conditions can be found in [19,20,21,22,23].…”

“…In addition to the re-entrant hexagon, other extensively researched auxetic structures include rotating rectangles and triangles, arrowhead and star shaped arrangements [9]. These auxetic structures have been manufactured into foams, polymers, composites and metals [10]. A study carried out in [11] analysed the static and dynamic properties of polyurethane foams with an auxetic microstructure.…”

“…In comparison to non-auxetic polyurethane foam, the auxetic foam exhibited a notable increase in stiffness under compression. More studies have also indicated the significant effects of the Poisson's ratio of auxetics, on their mechanical properties [10,12,13,14,15]. An investigation on two-dimensional reentrant hexagon structures presented in [10], found that the vibration isolation performance of these structures depends on various geometric properties of the auxetic cells.…”

“…More studies have also indicated the significant effects of the Poisson's ratio of auxetics, on their mechanical properties [10,12,13,14,15]. An investigation on two-dimensional reentrant hexagon structures presented in [10], found that the vibration isolation performance of these structures depends on various geometric properties of the auxetic cells. Numerical analysis results have shown that optimisation of the cell thickness and cell angle of auxetics, results in a significant increase in the vibration level difference, when compared to preliminary models.…”