Structural mechanics of negative stiffness honeycomb metamaterials
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Accepted version
Author(s)
Mehreganian, Navid
Fallah, Arash S
Sareh, Pooya
Type
Journal Article
Abstract
The development of multi-stable structural forms has attracted considerable attention in the design of architected multi-materials, metamaterials, and morphing structures, as a result of some unusual properties such as negative stiffness and, possibly, negative Poisson's ratio. Multi-stability is achieved through a morphological change of shape upon loading, and in doing so multi-stable structures undergo transitions from one equilibrium state to another. This paper investigates the structural performance of the negative stiffness honeycomb (NSH) metamaterials made of double curved beams which are emerging in various applications such as sensors, actuators, and lightweight impact protective structures with structural tunability and recoverability. An analytical treatment is pursued using the Euler–Lagrange theorem and the stability of the honeycomb has been studied. Based on a static analysis of the nonlinear elastic system, the developed tangent stiffness matrix and ensuing deformation curve were assessed through multiple phases of deformation. The closed-form solution was in good agreement with the numerical finite element (FE) model at different bistability ratios. It was shown that the bistability ratio had a pronounced effect on the overall response of the honeycomb and the desired negativity in the stiffness matrix could be achieved with high bistability ratios.
Date Issued
2021-05-01
Date Acceptance
2021-01-25
Citation
Journal of Applied Mechanics, 2021, 88 (5), pp.051006-1-051006-10
ISSN
0021-8936
Publisher
ASME International
Start Page
051006-1
End Page
051006-10
Journal / Book Title
Journal of Applied Mechanics
Volume
88
Issue
5
Copyright Statement
© 2021 by ASME
Identifier
https://asmedigitalcollection.asme.org/appliedmechanics/article/88/5/051006/1096925/Structural-Mechanics-of-Negative-Stiffness
Subjects
Mechanical Engineering & Transports
0901 Aerospace Engineering
0905 Civil Engineering
0913 Mechanical Engineering
Publication Status
Published
Date Publish Online
2021-02-16