Abstract
A matrix analytical compliance model is developed to evaluate the out-of-plane quasi-static response of general flexible hinges formed of serially-connected straight- and circular-axis segments with small and constant out-of-plane width, variable in-plane thickness, under the coupled action of bending and torsion. These flexible hinges can be used as standalone sensing devices or as monolithic joints in precision positioning and translatory-motion guiding mechanisms. The multiple-segment hinge compliances are obtained by adding the rotated, translated, and/or flipped individual segment compliances. The general model is applied to a class of symmetric flexible hinges and a particular design thereof is proposed. For several sets of geometric parameters, the hinge analytical compliances are validated by finite element simulation. This design is further incorporated into an out-of-plane-motion stage whose translatory and rotary stiffnesses are calculated based on the compliances of the three identical flexible hinges.
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