Electrical Actuators Alloy Selection, Processing and Evaluation

Force/displacement actuators with the high output power and time response can be fabricated from shape memory wires or ribbons. Typically Ni-Ti shape memory alloys are used as an active material in such actuators. They are driven by Joule heating and air convection cooling. In the present work, the time response of various types of Ni-Ti actuators having different transformation temperatures and geometrical sizes, is studied systematically under conditions of free and forced air convection.The simple analytical model for calculating the time response is developed which accounts for the latent heat and thermal hysteresis of transformation. For all the types of considered actuators, the calculated time response is in a good agreement with that observed experimentally. Finally, on the base of the suggested model, we present the time response of Ni-Ti actuators calculated as a function of their transformation temperature and cross section dimensions.

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The Design of a NI-TI Based Shape Memory Alloy Actuator

Dayananda,

Shankar

2023

joast

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A simpffied procedure for the design of SMA(Shape Memory Alloy) actuators is presented. The inter-relationship between the mechanical properties and the electrical properties that are relevant for the design of SMA actualors working under a conEtant load are clearly brought out. The dilferent conditions that arise while using an SMA actuator against o constant load has been considered. The locus of SMA acluators in relation to conventional actuators has been clartfied. The joule heating efects and power developed by the SMA actuator in relation to its weight has been also dealt with.

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Electrical Actuators Alloy Selection, Processing and Evaluation

Cited by 3 publications

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Estimation of hysteretic properties for pseudo-elastic materials

Estimation of hysteretic properties for pseudo-elastic materials

Time Response of Shape Memory Alloy Actuators

The Design of a NI-TI Based Shape Memory Alloy Actuator

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