NiTi Shape Memory Alloy Active Element Behavior in Long Time Solicitation Conditions

Adela Ursanu Dragoş; Sergiu Stanciu; Ramona Cimpoeşu; Cristian George Adoroaie; Petronela Paraschiv; Mihai Bernevig

doi:10.4028/www.scientific.net/AMM.657.387

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 657NiTi Shape Memory Alloy Active Element Behavior in...

NiTi Shape Memory Alloy Active Element Behavior in Long Time Solicitation Conditions

Abstract:

Equi-qtomic NiTi (nitinol) shape memory alloy (SMA) is a good potential candidate material for use as thermo-mechanical actuator in a large variety of engineering like automotive and aerospace applications. Shape memory alloy in action are required to perform a large number of actuation cycles under cyclic thermo-mechanical loads and therefor are subject of fatigue. A shape memory alloy, supplied from Nimesis Technology, with martensite to austenite temperature transformation domain 76-80 °C. The material characteristics were investigated through differential calorimetry (DSC) before and after the thermo-mechanical solicitations. Under Joule effect and a timer, the active element goes up to 3000 cycles with a 500g weight on. The properties of thermo-elastic martensite transformation are the elastic accommodation of volume and shape change that takes place due to change in crystal structure upon phase transformation. A modification of the first coil of the intelligent arch-wire suffer a modification of the temperature transformation domain increasing the As and Af temperature values.

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Periodical:

Applied Mechanics and Materials (Volume 657)

Pages:

387-391

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.657.387

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Online since:

October 2014

Authors:

Adela Ursanu Dragoş, Sergiu Stanciu, Ramona Cimpoeşu*, Cristian George Adoroaie, Petronela Paraschiv, Mihai Bernevig

Keywords:

Nitinol, SMA, Thermo-Mechanical Solicitation

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