Compliant mechanisms find use in numerous applications in both microscale and macroscale devices. Most of the current compliant mechanisms base their behavior on beam flexures. Their range of motion is thus limited by the stresses developed upon deflection. Conversely, the proposed mechanism relies on elastically nonlinear components to achieve large deformations. These nonlinear elements are composite morphing double-helical structures that are able to extend and coil like springs, yet, with nonlinear stiffness characteristics. A mechanism consisting of such structures, assembled in a simple truss configuration, is explored. A variety of behaviors is unveiled that could be exploited to expand the design space of current compliant mechanisms. The type of behavior is found to depend on the initial geometry of the structural assembly, the lay-up, and other characteristics specific of the composite components.
Multistable Morphing Mechanisms of Nonlinear Springs
Contributed by the Mechanisms and Robotics Committee of ASME for publication in the Journal of Mechanisms and Robotics. Manuscript received January 29, 2019; final manuscript received July 3, 2019; published online August 5, 2019. Assoc. Editor: Andrew P. Murray.
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Aza, C., Pirrera, A., and Schenk, M. (August 5, 2019). "Multistable Morphing Mechanisms of Nonlinear Springs." ASME. J. Mechanisms Robotics. October 2019; 11(5): 051014. doi: https://doi.org/10.1115/1.4044210
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