Use of Electrical Resistance to Modeling the Phase Transformation of Shape Memory Alloy

• Published in: 2022 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) pp. 1 - 6
• Main Authors: Da Silva, Wislayne Dayanne Pereira, Da Silva, Jaidilson Jo, Perkusich, Angelo
• Format: Conference Proceeding
• Language: English
• Published: IEEE 16.05.2022
• Subjects: Behavioral sciences; Constitutive Model; Cooling; Electrical Resistance; Mathematical models; Resistance; Shape Memory Alloy; Shape memory alloys; Temperature; Wires
• ISSN: 2642-2077
• DOI: 10.1109/I2MTC48687.2022.9806533

Constitutive models are widely used to characterize the behavior of Shape Memory Alloys (SMA). These models use the physical properties to mathematically describe the phase transformation and the thermo-mechanical relation between the systems components driven by SMA. However it is often disregarded the fact that some of the physical properties undergo changes throughout the thermal cycle. Taking these variations into account will assure not only better model accuracy but also reliability. In this work is proposed the usage of the SMA electrical resistance behavior to enhance the constitutive models accuracy. To do so, an experimental structure was developed to subject a SMA wire through cooling and heating cycles, through electrical current variation, and collect the required data. The constitutive model is divided in thermal, phase change and mechanical dynamics. The SMA electrical parameters are used as inputs of the thermal model, to estimate the wire temperature. Besides, with the resistance behavior analysis versus temperature, it is possible to obtain the phase changes temperatures. As a result, the model presents good performance to predict the hysteresis behavior of the phase transformation under different load conditions.