A spring-mass system with elastomeric beams and stretchable interconnects

Zining Yang, Randi Potekin, Alexander F. Vakakis, Seok Kim

Research output: Contribution to journalArticle

Abstract

This paper presents a design construct of a spring-mass system involving a silicon seismic mass, elastomeric beams, and stretchable metallic interconnects which exhibits a mechanical strain-based tunable spring constant and resonance. Serpentine-shaped metallic conductors are encapsulated in polyimide to form the electrical interconnects, which are then integrated on a microfabricated silicon seismic mass with elastomeric beams. The interconnected beam undergoes a nearly 93% elongation with high electrical conductance before failure, which benefits microelectromechanical systems (MEMS) devices requiring large deflection and reliable signal transmission simultaneously. Moreover, the experimental results show that the spring constant of the beams increases by more than a factor of four under 30% axial strain. The tunable resonant frequency of the spring-mass system is also characterized, showing that the resonant frequency changes from 85-155 Hz when a 10% axial strain is applied to the beams. Because of these unique tunable mechanical properties, the presented design construct of the spring-mass system serves as a platform for potential applications including soft MEMS sensors and vibration energy harvesters especially for low frequency and broadband ambient vibration sources.

Original languageEnglish (US)
Article number014003
JournalJournal of Micromechanics and Microengineering
Volume28
Issue number1
DOIs
StatePublished - Jan 2018

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Keywords

  • elastomeric beam
  • stretchable interconnect
  • tunable resonance
  • tunable spring constant

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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