Actuating Acceleration of Over 1.6 Million m/s2 Measured in Smart Material Ni-Mn-Ga
K. Ullakko, A.R. Smith, J. Tellinen
Lappeenranta University of Technology, Savonlinna, Finland
The mechanism that is responsible for the large strains in the magnetic shape memory alloy Ni-Mn-Ga is the movement of twin boundaries caused by an internal magnetic-field-induced stress. Many applications, such as actuators, sensors and microdevices, would greatly benefit from further understanding of twin boundary dynamics in Ni-Mn-Ga. In this study, a novel experimental method was created and a twin boundary velocity of 82.5 m/s, an actuation response time of 2.8 μs and an actuation acceleration of 1.6 × 106 m/s2 were experimentally observed. These experimental results have also been validated by independently developed theoretical calculations. This is the most rapid actuation and twin boundary movement observed thus far for Ni-Mn-Ga and an important material property to understand. These results may have a significant impact on future applications where speed and precision are essential.
ACTUATOR 2014 Manuscript A3.1
Publication date: 08/04/2015
Manuscript A3.1 published in Conference Proceedings ACTUATOR 2014
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