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Vol. 144, No. 9, September 2012, pp. 92-100




Geometrical Amplification of SMA Actuator Displacement Using Externally Actuated Beam
1 Elwaleed Awad Khidir, 1 Nik Abdullah Mohamed, 2 Sallehuddin Mohamed Haris

1 Institute of Space Science, Faculty of Engineering and Built Environment,
Universiti Kebangsaan Malaysia, 43600, Bangi, Selangor, Malaysia

2 Department of Mechanical and Materials Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600, Bangi, Selangor, Malaysia

Tel.: 0060142314544, fax: 00603-8921 6856,

E-mail: elwaleed@ukm.my



Received: 4 July 2012   /Accepted: 21 September 2012   /Published: 28 September 2012

Digital Sensors and Sensor Sysstems


Abstract: A major deficiency of shape memory alloy (SMA) actuators is that their displacement is limited. This paper discusses the utilization of deflected flexible beams to amplify the displacement of a SMA actuator. The actuator is composed of a SMA wire fixed eccentrically along a flexible beam dividing it into equally spaced segments. A geometrical model based on the assumption that the geometry of the beam when subjected to bending can be approximated by an arc (part of a circle). The model is built to compute the beam end displacement and deflection upon heating the SMA wire for different number of segments and different eccentricities. The model has been experimentally verified and the results showed that the model is useful to predict the geometrical behavior of the actuator.


Keywords: Shape memory alloy, Beam, Amplification



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