A compact quasi-zero stiffness metamaterial based on monolithic shells for vibration isolation

TL;DR

This paper introduces a novel monolithic shell-based quasi-zero stiffness metamaterial that achieves low-frequency vibration isolation without combining multiple components, using unique geometry and nonlinear deformation.

Contribution

The study presents a new QZS metamaterial design based solely on monolithic shells, eliminating the need for negative-stiffness components, and demonstrates its effectiveness through experiments and simulations.

Findings

Achieves near-zero stiffness through geometric design and nonlinear deformation.

Demonstrates effective low-frequency vibration isolation experimentally.

Provides a foundation for building complex metamaterials with multiple zero-stiffness features.

Abstract

Quasi-zero stiffness (QZS) metamaterials are highly effective in isolating objects from low-frequency external vibrations, due to their high static stiffness but low dynamic stiffness characteristics. Traditionally, QZS metamaterials are designed by combining a negative-stiffness part with a positive-stiffness counterpart. Here, we present a novel QZS metamaterial design without relying on combining two components. The QZS characteristic is achieved solely through monolithic shell elements' unique geometry and nonlinear deformation. Using experimental and numerical approaches, we investigate the static and dynamic responses of the proposed metamaterials as a function of their geometric parameters. We then tune the structure's geometry to achieve ideal zero-stiffness behaviors and experimentally demonstrate an exceptional low-frequency vibration isolation mechanism. This concept can be further utilized as a building block for constructing metamaterials with multiple zero-stiffness features, enabling a broad range of applications.