A Three Degree-of-Freedom Model for Self-Retracting Fully Compliant Bistable Micromechanisms

[+] Author and Article Information
Nathan D. Masters

Georgia Institute of Technology, 326714 Georgia Tech Station, Atlanta, GA 30332-1125

Larry L. Howell

Department of Mechanical Engineering, Brigham Young University, Provo, UT 84602

J. Mech. Des 127(4), 739-744 (Jun 27, 2005) (6 pages) doi:10.1115/1.1828463 History: Received February 10, 2004; Revised April 27, 2004; Online June 27, 2005
Copyright © 2005 by ASME
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Scanning electron micrograph (SEM) of SRFBM system: (a) SRFBM; (b) and (c) forward and return thermomechanical in-plane microactuators (TIM), respectively; (d) electrical switching contacts; and (e) electrical bond pads for resistive thermal self-retraction
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SRFBM (a) single degree-of-freedom double-slider model overlayed with SRFBM geometry, and (b) three degree-of-freedom pseudo-rigid-body model
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Vector loop diagram superposed on the PRBM. The vector z̄3 is offset for clarity.
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Comparison of SRFBM models: (a) force-deflection and (b) potential energy. Equilibria are identified in the potential energy curves as minima (stable) and maxima (unstable) and correspond to the zeros of the force-deflection curves. The MCF (measured critical force) is depicted as a horizontal line.
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SEM images showing force tester and SRFBM in the second stable equilibrium position




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