Case Studies in the Preliminary Design of SMA Actuators
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In spite of the rather complex and hysteretic behavior of SMA components (wires and springs), and the complex changes that occur in their microstructures, the preliminary design of SMA wires and springs turns out to be reasonably simple provided we utilize their shape memory characteristics in specific ways. Designing SMA actuators requires defining actuation intervals (temperature profile), load levels and/or displacement outputs over its intended designed life. The alloy composition dictates the transformation temperatures and the component’s operating range. SMA components could be functional under load controlled or displacement controlled or simultaneous load and displacement controlled setups.
KeywordsHeat Transfer Coefficient Entry Hole Compression Spring Hollow Shaft Tension Spring
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