The paper presents the analytical model of a linear/rotary solid-state actuator formed by a shape memory wire wound over a cylindrical drum. The model assumes a bilinear stress-strain behaviour of the wire in the martensitic state (low temperature) and a linear elastic response in the austenitic state (high temperature). Based on simple equilibrium conditions, the model calculates the stress and strain distributions in the wire subjected to a constant backup force and to frictional sliding forces at the contact with the drum. Closed-form expressions are supplied for the stroke produced by whatever actuator geometry. The model shows that large strokes (up to one half of the drum diameter) are achieved if the frictional coefficient is kept below 0.01. Rolling-contact architectures or sonic-pulse excitation of the drum are discussed as technical solutions to obtain such low friction values.
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ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems
September 28–October 1, 2010
Philadelphia, Pennsylvania, USA
Conference Sponsors:
- Aerospace Division
ISBN:
978-0-7918-4415-1
PROCEEDINGS PAPER
Modelling of Wire-on-Drum Shape Memory Actuators for Linear and Rotary Motion Available to Purchase
Giovanni Scire` Mammano,
Giovanni Scire` Mammano
University of Modena and Reggio Emilia, Reggio Emilia, Italy
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Eugenio Dragoni
Eugenio Dragoni
University of Modena and Reggio Emilia, Reggio Emilia, Italy
Search for other works by this author on:
Giovanni Scire` Mammano
University of Modena and Reggio Emilia, Reggio Emilia, Italy
Eugenio Dragoni
University of Modena and Reggio Emilia, Reggio Emilia, Italy
Paper No:
SMASIS2010-3616, pp. 383-390; 8 pages
Published Online:
April 4, 2011
Citation
Scire` Mammano, G, & Dragoni, E. "Modelling of Wire-on-Drum Shape Memory Actuators for Linear and Rotary Motion." Proceedings of the ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, Volume 1. Philadelphia, Pennsylvania, USA. September 28–October 1, 2010. pp. 383-390. ASME. https://doi.org/10.1115/SMASIS2010-3616
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