16 April 2016 Modeling of electric resistance of shape memory alloys: self-sensing for temperature and actuation control of active hybrid composites
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Abstract
For actuation purposes active hybrid structures made of fiber reinforced polymers (FRP) and shape memory alloys (SMA) enable substantial savings concerning weight, space and cost. Such structures allow realizing new functions which are more or less impossible with commonly used systems consisting of the structure and the actuator as separated elements, e.g. morphing winglets in aeronautics. But there are also some challenges that still need to be addressed. For the successful application of SMA FRP composites a precise control of temperature is essential, as this is the activating quantity to reach the required deformation of the structure without overloading the active material. However, a direct measurement of the temperature is difficult due to the complete integration of SMA in the hybrid structure. Also the deformation of the structure which depends on the temperature, the stiffness of the hybrid structure and external loads is hard to determine. An opportunity for controlling the activation is provided by the special behavior of the electrical resistance of SMA. During the phase transformation of the SMA - also causing the actuation travel - the resistance drops with rising temperature. This behavior can be exploited for control purposes, especially as the electrical resistance can be easily measured during the activation done by Joule heating. As shown in this contribution, theoretical modelling and experimental tests provide a load-independent self-sensing control-concept of SMA-FRP-hybrid-structures.
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Sebastian Nissle, Sebastian Nissle, Moritz Hübler, Moritz Hübler, Martin Gurka, Martin Gurka, "Modeling of electric resistance of shape memory alloys: self-sensing for temperature and actuation control of active hybrid composites", Proc. SPIE 9801, Industrial and Commercial Applications of Smart Structures Technologies 2016, 98010A (16 April 2016); doi: 10.1117/12.2219077; https://doi.org/10.1117/12.2219077
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