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Using a R-Phase SMA Methodology to Design an Energy Harvesting Unit With Tight Temperature Hysteresis

[+] Author Affiliations
Konstantin Lygin, Alexander Czechowicz, Horst Meier

Ruhr-Universität Bochum, Bochum, Germany

Paper No. SMASIS2013-3112, pp. V001T04A009; 7 pages
doi:10.1115/SMASIS2013-3112
From:
  • ASME 2013 Conference on Smart Materials, Adaptive Structures and Intelligent Systems
  • Volume 1: Development and Characterization of Multifunctional Materials; Modeling, Simulation and Control of Adaptive Systems; Integrated System Design and Implementation
  • Snowbird, Utah, USA, September 16–18, 2013
  • Conference Sponsors: Aerospace Division
  • ISBN: 978-0-7918-5603-1
  • Copyright © 2013 by ASME

abstract

Shape memory alloys (SMA) are smart materials with the ability to remember a previous imprinted shape after plastic deformation. The shape memory actuator effect is induced by thermal energy. Its bases on crystalline transformation of NiTi-alloys from the austenitic B2 to the martensitic B19′ phase. Usually, SMA actuators show a large temperature hysteresis with high strokes and loads. A lot of technical applications are realizable with SMA-actuators, for example in automotive sector. Under special conditions an additional phase, the R-phase occurs in SMA. This transformation from the austenitic B2 phase to the R-phase is characterized by a very small temperature hysteresis. Compared to conventional transformation characteristic of B2 ⇒ B19′, the R-phase transformation has small stroke and load. Because of this the R-Phase transformation qualifies for temperature sensitive and autarkical applications in air-conditioning or heating systems. Today’s problem for engineers designing R-phase actuators is that a lot of rules and parameters need to be considered. This paper presents a methodology, which can be used as a guideline to support engineers designing R-phase actuators. The whole process from defining requirements to prototyping will be discussed for the development of an energy harvesting actuator, which uses a low thermal energy potential. This paper contribution is to fill this gap in product development methodologies for shape memory actuators.

Copyright © 2013 by ASME

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