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Functional and Economical Evaluation of Reused SMA Actuators



Author(s)

Christian Rathmann, Benjamin Fleczok and Bernd Kuhlenkötter

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DOI:10.17265/2328-2223/2015.04.005

Shape memory alloys are characterized, among others, by high workload, noiselessness and electromagnetic compatibility. Their special thermal behavior offers a wide range of configuration options. In this context, one unique property is that SMAs (shape memory alloys) can recover their mechanical properties to a certain degree by heat treatment. This distinguishes them from most materials which are worn out when in use, which makes maintenance necessary. The purpose of this paper is to investigate the change of properties of reused SMA actuators. The traditional maintenance processes for SMA actuators and maintenance processes based on reused SMA actuators are presented and discussed. Additionally, experiments are performed in order to evaluate the re-use SMA actuators. The SMA actuator is evaluated through key performance indicators. Finally, the paper evaluates the reuse of SMA actuators from a technical and economical perspective based on a requirement profile of a certain SMA actuator. The replaced reused SMA actuator system is compared to a replaced new SMA actuator system. Future studies should consider various parameters of the heat treatment and its effect on the key performance indicator of SMA actuators.

Shape memory alloys, heat treatment, actuator, material, self healing, fatigue.