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http://dx.doi.org/10.3795/KSME-A.2007.31.3.373

Experimental Test and Numerical Simulation on the SMA Characteristics and Behaviors for Repeated Actuations  

Kim, Sang-Haun (서울대학교 대학원 기계항공공학부)
Cho, Maeng-Hyo (서울대학교 기계항공공학부)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.31, no.3, 2007 , pp. 373-379 More about this Journal
Abstract
In this study, we observe the application of shape memory alloy(SMA) into smart structures for repeatable actuation, because SMA changes its material properties and characteristics progressively under cyclic loading conditions and finally reaches stable path(state) after a certain number of stress/temperature loading-unloading cycles, so called 'training'. In this paper, SMA wires that have been in a stable state through the training are used. Stress-strain curve of the SMA wire at different temperature levels are measured. In addition, we observe other important effects such as the rate effect according to strain rates for rapid actuation response. The current work presents the experimental test using SMA wire after training completion by mechanical cycling. Through these tests, we measure the characteristics of SMA. With the estimated SMA properties and effects, we compare the experimental results with the simulation results based on the SMA constitutive equations.
Keywords
Shape Memory Alloy; Behavior Stabilization; Training Effect; SMA Constitutive Equation;
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