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

반복적인 작동을 위한 형상기억합금의 특성 실험과 거동 전산 모사

  • 김상헌 (서울대학교 대학원 기계항공공학부) ;
  • 조맹효 (서울대학교 기계항공공학부)
  • Published : 2007.03.01

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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  1. ) for Shape Memory Alloy (SMA) Actuator in Nucleoplasty vol.34, pp.5, 2010, https://doi.org/10.3795/KSME-A.2010.34.5.619