9 June 1999 Experimentally validated thermal model of thin film NiTi
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The primary focus of this work is to develop a new analytical approach for thermal modeling of Nickel Titanium (NiTi) shape memory alloy membranes undergoing both phase transformation and large deflections. This paper describes a thermal model of a NiTi plate or thin film, including all the modes of heat loss and latent heat dissipation during the phase transformation. This model is used to predict the NiTi temperature during cooling. The results are compared with experiments conducted on a NiTi plate and thin film (3 micrometers thick), and very good agreement is found. The thermal model is also used to predict the temperature response of a bubble actuator proposed for use in a forced flow environment. Using a 3 mm diameter, 3 micrometers thickness bubble under forced airflow conditions it is possible to achieve a frequency response faster than 300 Hz. Additional calculations were made to verify the structural stability of the actuator system. Predictions indicated that for specific geometries a pressure of at least 35 kPa can be supported by the NiTi membrane. Deflections of a bubble actuator are shown to be on the order of 10% of its diameter while the strain remains below 4%.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jenna E. Favelukis, Adrienne S. Lavine, and Gregory Paul Carman "Experimentally validated thermal model of thin film NiTi", Proc. SPIE 3668, Smart Structures and Materials 1999: Smart Structures and Integrated Systems, (9 June 1999); doi: 10.1117/12.350737; https://doi.org/10.1117/12.350737


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