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Publication - Dr Alberto Pirrera

    Multistable Morphing Mechanisms of Nonlinear Springs

    Citation

    Aza, C, Pirrera, A & Schenk, M, 2019, ‘Multistable Morphing Mechanisms of Nonlinear Springs’. Journal of Mechanisms and Robotics, vol 11.

    Abstract

    Compliant mechanisms find use in numerous applications both in micro and macro scale 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 on other characteristics specific of the composite components.

    Full details in the University publications repository