Modeling and simulation of a compact push–pull rubber actuator energized by an outer coil of shape memory wire

• Autores: Eugenio Dragoni, Giovanni Scirè Mammano
• Localización: Mechanics based design of structures and machines, ISSN 1539-7734, Vol. 46, Nº. 5, 2018, págs. 578-590
• Idioma: inglés
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• Resumen

  • This paper introduces the concept and develops the theory for a push–pull actuator made by winding a thin shape memory wire on a solid rubber cylinder.

    The incompressibility of the rubber converts the thermomechanical contraction of the heated wire in twice as much axial strain available in the rubber core.

    The intrinsic elastic backup provided by the core allows push–pull action of the device. Based on the assumption of both material and geometric linearity, a simple theoretical model is developed, which culminates in a simple closedform equation for the output stroke of the actuator. The theoretical predictions closely agree with rened nite element simulations, anticipating a net stroke of about 5–6% of the overall actuator length, depending on the outer load applied. The working principle of the actuator and the accuracy of the model are validated by tests on a proof-of-concept prototype.