The design of a Ni-Ti based shape memory alloy actuator

A simplified 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 actuators working under a constant load are clearly brought out. The different conditions that arise while using an SMA actuator against a constant load has been considered. The locus of SMA actuators in relation to conventional actuators has been clarified. The joule heating effects and power developed by the SMA actuator in relation to its weight has been also dealt with