Nonlinear thermomechanical design of microfabricated thin plate devices in the post-buckling regime

Namiko Yamamoto, D. J. Quinn, N. Wicks, J. L. Hertz, J. Cui, H. L. Tuller, B. L. Wardle

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

A design approach for thermomechanically stable sub-micron plates is developed utilizing the post-buckling regime via a nonlinear plate analysis. Based on the analysis results and experimental observations, local stresses are observed to have maxima in the near-post-bifurcation regime, but then to decrease significantly in the post-buckling regime. This effect is more significant with plates of larger sidelength and smaller thickness structures, enabling microfabrication of numerous plate and membrane structures that are typically considered susceptible to failure due to buckling. Using a stress-based failure criterion, rather than the typical buckling criterion, an expanded design space for thin plates beyond the traditional pre-buckling regime is revealed. A device class that benefits in both power and efficiency from thin, large-area freestanding plates is microfabricated fuel cells, particularly high-temperature solid oxide fuel cells (νSOFCs). As a demonstration of the expanded design space, νSOFCs of submicron (450 nm) layer thickness are designed, fabricated and operated in the far postbuckled regime, verifying thermomechanical stability (up to 625 °C) and functional operation. The design approach introduced here can be applied to a range of microfabricated devices such as purification membranes, electrolysis cells and biochemical sensors.

Original languageEnglish (US)
Article number035027
JournalJournal of Micromechanics and Microengineering
Volume20
Issue number3
DOIs
StatePublished - Mar 12 2010

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Buckling
Solid oxide fuel cells (SOFC)
Membrane structures
Microfabrication
Electrolysis
Purification
Fuel cells
Demonstrations
Membranes
Sensors
Temperature

All Science Journal Classification (ASJC) codes

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

Cite this

Yamamoto, Namiko ; Quinn, D. J. ; Wicks, N. ; Hertz, J. L. ; Cui, J. ; Tuller, H. L. ; Wardle, B. L. / Nonlinear thermomechanical design of microfabricated thin plate devices in the post-buckling regime. In: Journal of Micromechanics and Microengineering. 2010 ; Vol. 20, No. 3.
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Nonlinear thermomechanical design of microfabricated thin plate devices in the post-buckling regime. / Yamamoto, Namiko; Quinn, D. J.; Wicks, N.; Hertz, J. L.; Cui, J.; Tuller, H. L.; Wardle, B. L.

In: Journal of Micromechanics and Microengineering, Vol. 20, No. 3, 035027, 12.03.2010.

Research output: Contribution to journalArticle

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