An improved understanding of the three-dimensional behavior of fully compliant bistable micromechanisms (FCBMs) would facilitate their appropriate implementation in applications such as threshold sensing arrays. A 3-D finite element model was developed to analyze the motion of a nominal FCBM design with various eccentric and off-axis loading conditions. Roll, pitch, and yaw rotations and Z-direction deflection results are presented for various loading conditions. Two distinct behaviors are discussed. Phenomenon 1 occurred when no off-axis loads were applied or when the magnitudes were small. Phenomenon 1 is characterized by shuttle motion with a relatively large pitch rotation. Phenomenon 2 occurred for larger magnitudes of off-axis loads, and was characterized by larger Z-direction deflections, lower actuation forces, and occasional loss of bistability.

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